WO2013088000A1 - Materiau a base d'alumine, a structure multiechelle, comprenant un liant phosphate d'aluminium ayant une bonne resistance mecanique et son procede de preparation - Google Patents
Materiau a base d'alumine, a structure multiechelle, comprenant un liant phosphate d'aluminium ayant une bonne resistance mecanique et son procede de preparation Download PDFInfo
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- WO2013088000A1 WO2013088000A1 PCT/FR2012/000491 FR2012000491W WO2013088000A1 WO 2013088000 A1 WO2013088000 A1 WO 2013088000A1 FR 2012000491 W FR2012000491 W FR 2012000491W WO 2013088000 A1 WO2013088000 A1 WO 2013088000A1
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- Prior art keywords
- particles
- alumina
- median diameter
- small
- diameter
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- 239000000463 material Substances 0.000 title claims abstract description 193
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 190
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 20
- 239000002694 phosphate binding agent Substances 0.000 title description 3
- 239000002245 particle Substances 0.000 claims abstract description 359
- 239000011230 binding agent Substances 0.000 claims abstract description 70
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 28
- 238000002459 porosimetry Methods 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims description 69
- 239000002243 precursor Substances 0.000 claims description 62
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 54
- 239000000203 mixture Substances 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 30
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 26
- 238000001354 calcination Methods 0.000 claims description 26
- 238000009826 distribution Methods 0.000 claims description 25
- 238000001878 scanning electron micrograph Methods 0.000 claims description 19
- 238000007493 shaping process Methods 0.000 claims description 19
- 239000011362 coarse particle Substances 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical class [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 239000011973 solid acid Substances 0.000 claims description 3
- -1 aluminum oxyhydroxides Chemical class 0.000 claims description 2
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 description 45
- 230000008520 organization Effects 0.000 description 42
- 239000000243 solution Substances 0.000 description 33
- 239000002253 acid Substances 0.000 description 30
- 235000011007 phosphoric acid Nutrition 0.000 description 25
- 239000000843 powder Substances 0.000 description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 18
- 229910001593 boehmite Inorganic materials 0.000 description 17
- 230000015572 biosynthetic process Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 12
- ZZBAGJPKGRJIJH-UHFFFAOYSA-N 7h-purine-2-carbaldehyde Chemical compound O=CC1=NC=C2NC=NC2=N1 ZZBAGJPKGRJIJH-UHFFFAOYSA-N 0.000 description 11
- 239000011148 porous material Substances 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 239000003570 air Substances 0.000 description 7
- 238000004626 scanning electron microscopy Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 239000012080 ambient air Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 238000001694 spray drying Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 239000012798 spherical particle Substances 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000001033 granulometry Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000004452 microanalysis Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 238000009736 wetting Methods 0.000 description 3
- 238000004438 BET method Methods 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910001679 gibbsite Inorganic materials 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005550 wet granulation Methods 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 108010068977 Golgi membrane glycoproteins Proteins 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001680 bayerite Inorganic materials 0.000 description 1
- 230000002902 bimodal effect Effects 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 1
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910001682 nordstrandite Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/95—Products characterised by their size, e.g. microceramics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to the field of alumina-based materials, in the form of a millimetric object, porous and having good mechanical strength. More specifically, it relates to a multiscale structure material resulting from a hierarchical assembly of small and large particles preferentially spherical, micrometric and porous alumina and a binder consisting of aluminum phosphate and its process of preparation.
- alumina-based materials made up of at most a single class of particles bound together by a binder, in the form of a millimetric and porous object, are widely described in the prior art such as, for example, in patent US6780817.
- the particles that constitute these materials are particles of alumina or particles originating from solid precursors of alumina (oxides, oxyhydroxides or aluminum hydroxides), and in this case which do not disperse during the process of setting form, and which will therefore be present within the final material.
- the solvent used is also a solid precursor of alumina but with a better dispersion capacity than that of the particles, during the shaping process.
- the textural properties (BET surface area, mesoporous and macroporous volume, mesopore diameter) of the material are directly related to the textural properties of the particles and the binder used in the preparation of said materials.
- the mesoporous and macroporous volumes are influenced by the amount of particles and binder.
- a large macroporous volume can be obtained if the binder content is low, and in this case the mechanical properties of the material are strongly degraded.
- An improvement in the mechanical strength can be sought by increasing the eneur binder, which implies a decrease in macroporous volume but also a decrease in the amount of particles within the material.
- the mesoporosity of the material may be degraded due to a small amount of porous particles, and therefore, the neoporosity provided to the material and from said particles is less important.
- the characteristics of the mesopores are attributed to the organization of the alumina crystallites which depends on the preparation process and in particular on the synthesis of the alumina precursor or on the elaboration of a millimetric object.
- the improvement of the textural properties of said particles such as an increase in the specific surface area, the mesoporous volume or the size of the mesopores may be desired and obtained by synthesis or post-synthesis treatment. However, these characteristics e degrade partially during the shaping.
- the present invention relates to an alumina-based material, in the form of a millimetric object, having a multiscale, porous structure and having a good mechanical strength which results from an assembly. hierarchized small and large micrometric and porous particles based on alumina and a binder consisting of aluminum phosphate ensuring the cohesion of said material and on its preparation process.
- the interest of the invention relates to the hierarchical organization of small and large micrometric particles porous alumina, which maximizes the content of particles within the material and therefore, to increase the mesoporous volume of said material.
- the hierarchical organization also minimizes the amount of binder because the space between the large particles is filled by the small particles, and therefore, the binder content necessary to ensure the cohesion of the material is minimized.
- This binder makes it possible to ensure a minimal macroporous volume but sufficient for accessibility to the porosity of said micrometric particles.
- the hierarchical organization ensures proper mechanical properties. Moreover, an improvement of these properties can be obtained by the use of a specific binder.
- an object of the present invention relates to a material, in the form of a millimeter object, consisting of large particles of alumina having a median diameter of between 10 and 200 ⁇ m, said large particles being distant, from an interface to the other, less than 10 ⁇ , small particles of alumina having a median diameter of between 0.5 and 10 ⁇ m, said small particles being distant, from one interface to another, of less than 5 ⁇ m and being located in the space between the large particles, and a binder consisting of aluminum phosphate, said binder being located in the space between said small and large particles, said material having a mesoporous volume, measured by mercury porosimetry, between 0.2 and 2 mL / g, a macroporous volume, measured by mercury porosimetry, of between 0.05 and 0.2 mL / g and a BET specific surface area of between 80 and 350 m 2 / g.
- Another object of the present invention relates to a process for preparing said material which comprises at least the following steps:
- step c) drying the raw material obtained at the end of step b) and; d) calcination of the dried material from step c).
- An advantage of the present invention is to provide a material having a maximized proportion of small and large porous particles due to the hierarchical organization of said particles within the material and thus to provide a material having a very wide range of texture, in particular a mesoporous volume up to the value of 2mlJg much greater than the mesoporous volume values generally observed for alumina-based materials consisting of at most a single class of particles collected by a binder of the prior art.
- Another advantage of the present invention is to provide a material having enhanced strength properties. This is due to the combined effect of the hierarchical organization of the small and large particles of alumina material according to the invention and the cohesion of said material provided by the presence of a specific binder.
- the material according to the invention has a maximized lateral crushing strength up to very high values of force, up to 100 N for a material according to the invention of cylindrical shape, with a diameter of 2 mm. and of length equal to 4 mm, which are force values much greater than those observed for alumina materials consisting of a single class of particles collected by a binder of the prior art.
- Another advantage of the present invention is also to provide a method of preparation for obtaining said material having increased mechanical strength properties by mixing in a step a) micrometric particles of alumina with a solid precursor of alumina and a solution of phosphoric acid in such proportions that the specific P / Al molar ratio leads to the in situ generation of a specific binder consisting of aluminum phosphate at the end of a step d) of calcination of the material dried and shaped.
- step a) a good flow of the mixture obtained in step a) during step b) which limits the generation of geometric defects and micrometric defects on the surface of the raw material thus improving the appearance and strength of the material as a millimetric object obtained according to the invention; the formation of defects related to the densification of the binder during steps c) and d) is minimized because of its location in the small space between the micrometric particles of alumina which improves the mechanical strength of the material in form millimetric object obtained according to the invention.
- the present invention relates to a material, in the form of a millimetric object, consisting of large particles of alumina having a median diameter of between 10 and 200 ⁇ m, said large particles being distant, from one interface to another, of less than 10 ⁇ m, small alumina particles having a median diameter of between 0.5 and 10 ⁇ m, said small particles being spaced, from one interface to another, of less than 5 ⁇ m and being located in the space between the large particles and a binder consisting of aluminum phosphate, said binder being located in the space between said small and large particles, said material having a mesoporous volume, measured by mercury porosimetry, of between 0.2 and 2; mL / g, a macroporous volume, measured by mercury porosimetry, of between 0.05 and 0.2 mUg and a BET specific surface area of between 80 and 350 m 2 / g.
- mesoporous volume is meant the volume of pores whose diameter is between 3.6 and 50 nm.
- the mesoporous volume is measured by mercury porosimetry, the method of which is described below. More particularly, the term mesoporous volume, a pore volume corresponding to the volume of mercury which is entered into the pores with a diameter of between 3.6 and 50 nm.
- macroporous volume the volume of pores whose diameter is between 50 and 7000 nm.
- the macroporous volume is measured by mercury porosimetry, the method of which is described below. More particularly, by macroporous volume, a pore volume corresponding to the volume of mercury which is entered into the pores with a diameter of between 50 and 7000 nm.
- Mercury porosimetry is performed according to ASTM D4284-83, using a surface tension of 480 dyne / cm and a contact angle of 140 °. The wetting angle was taken as 140 ° following the recommendations of the book "Techniques of the Engineer, analyzed analysis and characterization, P 1050-5, written by Jean Charpin and Bernard Rasneur".
- BET specific surface area is understood to mean a specific surface area determined by nitrogen adsorption according to ASTM D 3663-78 established from the BET method (Brunauer-Emmett-Teller) described in the periodical. "The Journal of the American Society", 60, 309 (1938).
- the large particles and the small particles of alumina which constitute the material according to the invention are, by their size, micrometric particles.
- the material according to the present invention is advantageously constituted by the hierarchical organization of small and large micrometric porous particles of alumina.
- micrometric particles refers throughout the text to all large and small particles. The total amount of micrometric particles is therefore the sum of large and small particles of alumina.
- micrometric particles which constitute the material according to the invention are transition aluminas.
- the micrometric alumina particles are transition aluminas chosen from chi, kappa, rho, eta, theta, gamma and delta alumina, alone or as a mixture, and preferably the transition alumina is alumina. gamma.
- the small and large particles or micrometric particles that constitute the material according to the present invention are advantageously porous particles.
- said particles are of rounded shape and even more preferably of spherical shape.
- Said small and large particles are advantageously agglomerates of nanometric crystallites of alumina.
- These crystallites are in the form of platelets, fibers or "blocks" whose dimensions are advantageously between 2 and 150 nm, preferably between 4 and 150 nm and preferably between 4 and 100 nm.
- the crystallites of alumina are the elementary entities which constitute the micrometric particles.
- the inter-crystallite space is responsible for the presence of the mesoporosity within said particles.
- the size of the crystallite agglomerates constituting the micrometric particles is analyzed by scanning electron microscopy (SEM).
- SEM scanning electron microscopy
- the average size of the crystallite agglomerates that make up the micrometric particles is determined from scanning electron microscopy (SEM) images of the material according to the invention using SMile View software. SEM images must be made on the material in fracture mode and with a secondary electron detector.
- the large particles of alumina constituting the material according to the invention have a median diameter of between 10 and 200 ⁇ m, preferably between 10 and 100 ⁇ m, and preferably between 10 and 80 ⁇ m.
- the term "median diameter” refers to the D50, i.e., the diameter of the equivalent disc such that 50% by number of said coarse particles has a size less than said diameter.
- the distribution of the particle size of said large particles of alumina within the material according to the invention is represented by the dimension DX, defined as the diameter of the equivalent disc such that X% in number of said large particles has a size less than said diameter. More precisely, the distribution of the particle size of said large particles is advantageously represented by the three dimensions D10, D50 and D90.
- Said material according to the invention advantageously has a distribution of the particle size of said large particles of alumina within said material such that the diameter D10 is at most 3 times lower than the median diameter D50 and preferably at most 2 times smaller than the median diameter D50 and such that the diameter D90 is at most 3 times greater than the median diameter D50 and preferably at most 2 times greater than the median diameter D50.
- the diameter of the large particles is determined, in the material according to the invention, from scanning electron microscopy (SEM) images of the material according to the invention, on a polished section, using the SMile View software.
- the median diameter is calculated from the average of the diameters determined on a number of measurements that the person skilled in the art deems necessary and sufficient and preferably on at least 200 measurements.
- said large particles are spaced, from one interface to another, less than 10 ⁇ m, preferably less than 8 ⁇ m, and preferably less than 6 ⁇ m.
- the distance between the interface of a large particle and the interface of the closest large particle is determined from scanning electron microscopy (SEM) images of the material according to the invention, on a polished section, at using the SMile View software.
- SEM scanning electron microscopy
- the measurements are made on a number of measurements that the person skilled in the art deems necessary and sufficient and preferably on 50 images in order to determine an average distance from one interface to the other.
- Said large particles advantageously have a median diameter less than 1/10 times the average diameter of the smallest dimension of the material according to the invention and preferably less than 1/50 times the average diameter of the smallest dimension of said material, in order to ensure complete filling of the space of said material.
- the large particles constituting the material according to the invention can advantageously be composed of two populations of particles having distinct median diameters.
- Said large particles may optionally comprise a proportion of particles, called “lower fat” particles, having a median diameter of between 10 and 60 ⁇ m and preferably between 15 and 30 ⁇ m and a proportion of particles called “larger” particles having a median diameter of between 60 and 200 ⁇ m and preferably between 100 and 180 ⁇ m.
- said material according to the invention advantageously has a distribution of the particle size of said "coarse” particles of alumina within said material such as that the diameter D10 is at most 3 times smaller than the median diameter D50 and preferably at most 2 times less than the median diameter D50 and such that the diameter D90 is at most 3 times greater than the median diameter D50 and preferably at most 2 times greater at the median diameter D50 and a distribution of the particle size of said "larger” particles of alumina in said material such that the diameter D10 is at most 3 times smaller than the median diameter D50 and preferably at most 2 times less than the median diameter D50 and such that the diameter D90 is at most 3 times greater than the median diameter D50 and preferably at most 2 times greater than the median diameter D50.
- the small particles which constitute the material according to the invention have a median diameter of between 0.5 and 10 ⁇ m, preferably between 0.5 and 6 ⁇ m and, preferably, between 0.5 and 3 ⁇ m. pm.
- median diameter refers to the D50, i.e., the diameter of the equivalent disc such that 50% by number of said small particles has a size smaller than said diameter.
- the distribution of the particle size of said small particles of alumina within the material according to the invention is represented by the dimension DX, defined as the diameter of the equivalent disk such that X% by number of said small particles has a size smaller than said diameter. More precisely, the distribution of the particle size of said small particles is advantageously represented by the three dimensions D10, D50 and D90.
- Said material according to the invention advantageously has a distribution of the particle size of said small particles of alumina within said material such that the diameter D10 is at most 3 times smaller than the median diameter D50 and preferably at most 2 times smaller than the median diameter D50 and such that the diameter D90 is at most 3 times greater than the median diameter D50 and preferably at most 2 times greater than the median diameter D50.
- the diameter of the small particles is determined, in the material according to the invention, from scanning electron microscopy (SEM) images of the material according to the invention on a polished section, using SMile View software.
- the median diameter is calculated from the average of the diameters determined on a number of measurements that the person skilled in the art deems necessary and sufficient and preferably on at least 200 measurements.
- said small particles are distant, from one interface to another, less than 5 ⁇ , preferably less than 3 ⁇ m, and preferably less than 2 ⁇ m.
- the distance between the interface of a small particle and the interface of the smallest particle closest is determined by scanning electron microscopy (SEM) images of the material according to the invention, on a polished section, using SMile View software.
- SEM scanning electron microscopy
- the measurements are made on a number of measurements that the person skilled in the art deems necessary and sufficient and preferably on 50 images in order to determine an average distance from one interface to the other.
- Said small particles advantageously have a median diameter less than 1/5 times the median diameter of the large particles, and preferably a median diameter less than 1/10 times the median diameter of the large particles. This makes it possible to fill the space between said large particles, said small particles being located in the space between said large particles.
- the proportion of said small particles is determined so as to fill the space between said large particles.
- the proportions of the small and large particles of alumina constituting the material according to the invention are expressed as surface percentages with respect to the total surface area of the SEM image of the material according to the invention, so as to indicate the area that the small and large particles occupy within the material, as well as the proportion of coarse fat particles having a median diameter of between 10 and 60 ⁇ m.
- the surface percentages of the micrometric particles are determined from the SEM image analysis of the material according to the invention, on a polished section.
- the resolution of the scanning electron microscope (SEM) is advantageously adapted to the median diameter of said micrometric particles so as to have an image representative of all the material according to the invention.
- the area occupied by the small particles is determined as follows: the diameter of all the small particles is measured using SMile View software, in order to calculate the area occupied by each of said small particles. The sum of each of the areas occupied by each of said small particles corresponds to the total area occupied by all of said small particles in the SEM image.
- the area occupied by the large particles is determined from the GIMP and Analysis software as follows: the edges of each of the large particles are delimited using the GIMP software. The area occupied by all of said large particles is then expressed as a percentage from the Analysis software.
- the proportion of small and large particles occupying the surface of the SEM image of the material according to the invention is expressed as a percentage by surface area relative to the total surface area of the SEM image of the material according to the invention. It is calculated according to the formula: (area occupied by small or large particles I total area of the image SEM) x100.
- the surface percentages are determined on a number of images that those skilled in the art deem necessary and sufficient and preferably on 10 images.
- the surface percentage of the small particles relative to the total surface of the SEM image of the material according to the invention is advantageously between 5 and 55%, preferably between 10 and 45% and preferably between 10 and 30%.
- the surface percentage of the large particles is advantageously between 35 and 85%, preferably between 45 and 80% and preferably between 60 and 80% relative to the total surface of the SEM image of the material according to the invention.
- the complement of the surface fraction that is to say, the sum of the surface percentages dd small and large particles subtracted 100%, corresponds to the surface percentage occupied by the binder consisting of aluminum phosphate, and the residual vacuum .
- the presence of residual vacuum in the SEM image, that is to say unfilled space is related to the existence of a macroporous volume within the material.
- said small particles are located in the space between the large particles.
- This assembly of small and large particles is at the origin of the hierarchical organization of said micrometric particles within the material.
- Said material according to the invention advantageously has a hierarchical organization.
- the hierarchical organization of said micrometric particles within said material leads to a very wide range of texture, in particular of mesoporous volume measured by mercury porosimetry on said material of between 0.2 and 2 ml / g.
- a binder consisting of aluminum phosphate is located in the space between small and large particles.
- said small particles fill the gap between the coarse particles and said binder fills the residual space between the small and coarse particles and the residual space between the small particles.
- Said binder fills the space between said micrometric particles so as to ensure the cohesion of the material according to the invention, and consequently, so as to minimize the residual vacuum, that is to say the unfilled space between said particles micrometric.
- the existence of residual vacuum is responsible for the presence of a macroporous volume within the material.
- the binder present in the space between the micrometric particles makes it possible to minimize the macroporous volume within the material according to the invention so that said macroporous volume of said material is between 0.05 and 0.2 mL / g, preferably included between 0.07 and 0.17 ml / g, and preferably between 0.1 and 0.15 ml / g.
- the binder must not interfere with the hierarchical organization of small and large particles, that is to say, that the binder must not move the micrometric particles apart from each other.
- said binder makes it possible to maintain a distance from one interface to another between the small particles of less than 5 ⁇ m, preferably less than 3 ⁇ m, and preferably less than 2 ⁇ m, and a distance from an interface to the other between the large particles less than 10 ⁇ m, preferably less than 8 ⁇ m and preferably less than 6 ⁇ m.
- said binder constituted aluminum phosphate.
- the location of the phosphorus originating from the binder consisting of aluminum phosphate in the material according to the invention is obtained by means of P phosphorus mapping made from scanning electron microscopy (SEM) coupled to the EDS (Energy) microanalysis. Dispersive Spectroscopy) (MEB-EDS). The material is analyzed on a polished section with a backscattered electron detector.
- Said binder is advantageously present in the material according to the invention in the form of particles having a mean size of less than 1 ⁇ m.
- the size of the particles constituting the binder can advantageously be measured, in the material according to the invention, by SEM image analysis with the help of SMile View software.
- the SEM images must be made on the material according to the invention in fracture mode and with a secondary electron detector.
- said material has a mesoporous volume measured by mercury porosimetry of between 0.2 and 2 ml / g, preferably between 0.2 and 1.5 mIg / g and preferably between 0.2 and 1 ml / ml. /boy Wut.
- said material has a macroporous volume measured by mercury porosimetry of between 0.05 and 0.2 ml / g, preferably between 0.07 and 0.17 ml / g and preferably between 0.1 and 0.15 mIg.
- said material has a median mesopore diameter measured by mercury porosimetry between 8 and 25 nm, preferably between 10 and 25 nm and preferably between 10 and 23 nm.
- said material has a BET specific surface area of between 80 and 350 m 2 / g, preferably between 80 and 250 m 2 / g and preferably between 80 and 200 m 2 / g.
- said material is in the form of a millimeter object.
- the mean diameter of the smallest dimension of the material according to the invention is advantageously between 0.5 and 10 mm, preferably between 0.7 and 5 mm, and preferably between 1.0 and 4.0. mm.
- the dimensions of the millimetric object can be obtained with any measuring tool adapted to the dimensions of said material and in particular with a vernier caliper.
- Said material is advantageously in the form of a granule or an extrusion and preferably in the form of an extrudate.
- the material according to the invention thus has maximized proportions of micrometric particles porous because of this hierarchical organization, resulting in a porous material and having good mechanical strength.
- the material according to the present invention has excellent strength properties. This is due to the combined effect of the hierarchical organization of the small and large particles of alumina material according to the invention and the cohesion of said material provided by the presence of a specific binder.
- the material according to the invention has a mechanical resistance to lateral crushing determined by the grain-to-grain (EGG) crushing test advantageously between 50 and 100 N, preferably between 60 and 100 N and so preferred between 80 and 100 N, expressed in force in the case of the materials according to the invention in the form of granules; and a mechanical resistance to lateral crushing advantageously between 1 and 2.5 daN / mm, preferably between 1 and 2.3 daN / mm and preferably between 1 and 2 daN / mm, expressed in force by unit of length in the case of the materials according to the invention in the form of extrudates.
- GSG grain-to-grain
- the mechanical strength of the material according to the invention determined by the grain-to-grain (GGE) crushing test.
- GGE grain-to-grain
- ASTM D4179-01 a standardized test that involves subjecting a material in the form of a millimeter object, such as a granule or extrusion, to a compressive force that causes the rupture. This test is therefore a measure of the tensile strength of the material. The analysis is repeated on a number of solids taken individually and typically on a number of solids between 10 and 200. The average of the lateral forces of rupture measured is the average EGG which is expressed in the case of the granules in unit of force (N), and in the case of extrusions in unit of force per unit length (daN / mm).
- Another subject of the present invention relates to a process for preparing said material comprising at least the following steps:
- step b) drying the raw material obtained at the end of step b) and;
- micrometric particles used in the mixing step a) of the preparation process, are transition aluminas chosen from chi, kappa, rho and eta alumina. theta, gamma and delta, alone or as a mixture, and preferably gamma-alumina, or are advantageously solid precursors of alumina chosen from hydrargillite, gibbsite, nordstrandite, bayerite, boehmite or pseudo-boehmite.
- the micrometric particles are solid precursors of alumina
- said precursors must be little dispersible in the acid solution introduced in the mixing step a) of the preparation process, that is to say in such a way that that the median diameter of said micrometric particles is little reduced during step a) and that the hierarchical organization of small and large particles can be observed within the material at the end of step d) of preparation according to the characterization techniques described in detail above.
- a phase transformation takes place so as to obtain the transition aluminas within said material.
- the micrometric alumina particles used in the mixing step a) of the preparation process are transition aluminas or solid precursors of alumina which are poorly dispersible in the solution of phosphoric acid used in said step a) of the preparation process, and which will be converted to transition alumina at the end of step d) of calcination.
- step a) of mixing the preparation process according to the invention small particles of alumina with a median diameter of between 0.5 and 10 ⁇ m are mixed with large particles of alumina with a median diameter of between 10 and 200 pm.
- said large particles of alumina have a median diameter of between 10 and 100 ⁇ m, and preferably between 10 and 80 ⁇ m.
- Said large particles mixed in step a) of the preparation process according to the invention may advantageously be composed of two populations of particles having distinct median diameters.
- Said large particles may optionally comprise a proportion of particles, called “lower fat” particles, having a median diameter of between 10 and 60 ⁇ m and preferably between 15 and 30 ⁇ m and a proportion of particles called “large” particles. higher “having a median diameter of between 60 and 200 ⁇ m and preferably between 100 and 180 ⁇ m.
- said small alumina particles have a diameter of between 0.5 and 6 ⁇ m and preferably between 0.5 and 3 ⁇ m.
- Said micrometric alumina particles mixed in step a) of the preparation process are advantageously used in powder form.
- the size distribution of said micrometric alumina particles in the powders used in said mixing step a) is measured by laser diffraction granulometry, based on the Mie diffraction theory (GBJ de Boer, C. de Weerd, D Thoenes, HWJ Goossens, Charact 4 (1987) 14-19).
- the distribution of the particle size of the micrometric alumina particles in the powders is represented by the dimension DvX, defined as the diameter of the equivalent sphere such that X% by volume of said particles has a size less than said diameter. More precisely, the distribution of the particle size of said particles is represented by the three dimensions Dv10, Dv50 and Dv90.
- the term "median diameter” used in the description of the preparation process according to the invention denotes the Dv50, that is to say the diameter of the equivalent sphere such that 50% by volume of said particles has a size less than said diameter.
- the distribution of the particle size of the small particles is such that the diameter Dv10 is at most 3 times smaller than the median diameter Dv50 and preferably at most 2 times less than the median diameter Dv50 and such that the diameter Dv90 is at most 3 times greater than the diameter.
- the distribution of the particle size of the larger particles and the particle size distribution of the "coarse" particles is advantageously identical to the particle size distribution of the small particles.
- the particle size distribution of the small particles is preferably monomodal, and the particle size distribution of the coarse particles may be monomodal or bimodal, in the case where said coarse particles are composed of said larger and lower coarse particles.
- the textural properties of said micrometric alumina particles are respectively determined by nitrogen adsorption and mercury porosimetry.
- the BET surface area, the mesoporous volume and the pore size distribution of the micrometric particles constituting the material according to the invention can be very variable depending on the process for preparing the alumina precursor used to prepare the micrometric particles and the operating conditions.
- Said micrometric particles advantageously have a BET specific surface area of between 100 and 480 m 2 / g, preferably between 120 and 300 m 2 / g, and preferably between 120 and 250 m 2 / g.
- said micrometric particles have a mesoporous volume of between 0.2 and 2.5 mL / g, preferably between 0.3 and 2.0 mL / g, and preferably between 0.3 and 1.5 mUg.
- said micrometric particles have a median mesopore diameter of between 7 and 25 nm, preferably between 7 and 24 nm, and preferably between 7.5 and 23 nm.
- the proportions of small and large particles introduced into the mixture of step a) is an essential criterion of the preparation process according to the present invention because said proportions define the compactness of the mixture of small and large particles. Said proportions lead to the hierarchical organization of small and large particles within the material obtained at the end of said preparation process. More specifically, the proportions of small and large particles are chosen so as to have a mixture of small and large particles which leads to a satisfactory compactness. Said compactness of the mixture of small and large particles is determined by a conventional packed fill density (TDD) measurement.
- TDD packed fill density
- step a) of mixing the preparation process according to the invention 10 to 60% and preferably 15 to 35% by weight of small alumina particles with a median diameter of between 0.5 and 10 ⁇ and 40 to 90% and preferably from 65 to 85% by weight of large alumina particles of median diameter between 10 and 200 ⁇ , the percentages being expressed relative to the total amount of micrometric particles.
- the hierarchical organization of micrometric particles of alumina will not be optimal given the large amount of small particles and the maximization of the proportion of micrometric particles of alumina. can not be reached because of a less compact organization.
- the proportion of large particles is too high and in particular greater than 90% by weight, the amount of small particles will not be sufficient to fill the voids between the large particles, and the hierarchical organization of micrometric particles of alumina will not be optimal because a less compact organization.
- Another essential criterion of the preparation process according to the invention is the introduction into step a) of a mixture of a solid precursor of alumina and of an acid in solution allowing the in situ generation of a binder consisting of of aluminum phosphate, after step d) of calcination of the preparation process according to the invention.
- the solid precursor of alumina and the acid in solution must be introduced in said step a) in the proportions as claimed.
- the generation of said binder consisting of aluminum phosphate requires a solid precursor of alumina which, in the presence of the acid solution, is more reactive than the micrometric alumina particles also introduced in step a) of mixing the preparation process according to the invention.
- the solid precursor of alumina must be able to disperse predominantly or dissolve predominantly in the acid solution used and form particles of average size less than 1 ⁇ between the micrometric particles.
- the micrometric alumina particles must be slightly degraded in the presence of said acid solution, that is to say that the median diameter of said alumina particles must be maintained in the presence of the acid in solution introduced in the presence of during step a) of the preparation process according to the invention.
- the solid precursor of alumina is advantageously chosen from aluminum oxides, aluminum hydroxides and aluminum oxyhydroxides that are soluble or dispersible in the phosphoric acid solution, preferably from aluminum hydroxides and oxyhydroxides. 'aluminum.
- said solid alumina precursor is an aluminum oxyhydroxide and more preferably said solid alumina precursor is boehmite or pseudo-boehmite.
- Said alumina precursor is advantageously in the form of a powder consisting of solid particles having a median diameter, determined by laser diffraction granulometry, of between 9 and 80 ⁇ m, preferably between 10 and 60 ⁇ m, and preferably between 15 and 60 ⁇ m. 45 ⁇ m.
- the particles of the solid precursor of alumina are advantageously constituted by agglomerates of elementary units, called crystallites, whose dimensions are advantageously between 2 and 150 nm, preferably between 4 and 150 nm and preferably between 4 and 100 nm. determined by transmission electron microscopy (TEM).
- the morphology of the crystallites, the size and the manner in which the crystallites are organized depend mainly on the synthesis route of the alumina precursor used to prepare said micrometric particles.
- the proportion of the solid precursor of alumina is between 5 and 50% by weight relative to the total amount of solid particles, preferably between 10 and 30% by weight, and preferably between 15 and 25% by weight.
- the total amount of solid particles is the sum of the micrometric particles (small and large alumina particles) and particles of the solid alumina precursor.
- the amount of solid precursor of alumina is less than 5% by weight relative to the total amount of solid particles introduced, the amount of binder consisting of aluminum phosphate which will be formed in situ after step d) calcination , will not be sufficient to ensure the cohesion of the hierarchical organization of small and large micrometric particles of alumina.
- the quantity of solid precursor of alumina is greater than 50% by weight relative to the total amount of solid particles
- the quantity of binder consisting of aluminum phosphate which will be formed in situ after step d) The amount of calcination will be greater than the amount necessary to fill the residual voids between the micrometric particles, and therefore the micrometric particles will be dispersed unorganized within said binder and the proportion of micrometric particles present in the resulting material. the preparation process according to the final invention will not be maximum.
- the phosphoric acid in solution is introduced into the mixture.
- Phosphoric acid is also called orthophosphoric acid.
- the role of the phosphoric acid solution is to promote the formation of an amorphous phase of aluminum phosphate from the reaction with the solid precursor of alumina.
- the particles of the solid precursor of alumina which initially have a median diameter of about ten microns become with the action of the acid and the mechanical energy provided during step a) of the process for preparing the material according to the invention, an amorphous phase of aluminum phosphate whose particles have an average size of less than 1 ⁇
- the phosphoric acid in solution is introduced in proportions such that the molar ratio P / Al is between 0.2 and 1.2.
- the phosphoric acid in solution is introduced in proportions such that said ratio P / Al is between 0.4 and 1.0, and preferably between 0.6 and 0.9.
- P is derived from the introduced phosphoric acid
- Al is derived from the solid precursor of alumina.
- the specific P / Al molar ratio as claimed corresponds to a proportion of phosphoric acid such that the ratio of the mass of acid introduced onto the mass of introduced alumina solid precursor is between 30 and 225% by weight, of preferably between 59 and 160% by weight and preferably between 89 and 125% by weight.
- the use of a molar ratio P / Al of between 0.2 and 1.2 in step a) of the preparation process according to the invention makes it possible to form the amorphous phase of aluminum phosphate at the same time. result of the reaction between phosphoric acid and the solid precursor of alumina, but also to promote the partial and minor dissolution of micrometric particles of alumina without affecting their size.
- This high acid ratio dissolution favors the local formation of aluminum phosphate, and consequently, after step d) of calcination, it makes it possible to increase the cohesion of the hierarchical organization of small and large particles. micrometric alumina and therefore the material obtained by the preparation process according to the invention.
- an organic binder may optionally be added in step a) of mixing.
- the presence of said organic binder facilitates shaping by extrusion.
- Said organic binder can advantageously be chosen from methylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, carboxymethylcellulose and polyvinyl alcohol.
- the proportion of said organic binder is advantageously between 0 and 5% by weight, preferably between 0 and 3% by weight and preferably between 0 and 1% by weight, relative to the total amount of solid particles.
- step d) of calcination of the preparation process according to the invention said organic binder is decomposed, that is to say that at the end of step d) calcination, said Organic binder is no longer present within the material according to the invention.
- step a) of the preparation process according to the invention is advantageously carried out in a single step or in two steps.
- step a) differs according to the shaping technique used in step b) of the preparation process according to the invention.
- the mixing step a) is preferably carried out in a single step.
- the micrometric alumina particles, the solid precursor of alumina, the acid in solution and optionally an organic binder are mixed all at once using a batch mixer, preferably with a cam or an arm. Z, or using a twin-screw mixer-mixer.
- the mixing conditions are adjusted in a manner known to those skilled in the art and aim to obtain a homogeneous and extrudable paste.
- the extrudability of the paste can advantageously be adjusted with the addition of water to the acid in solution, in order to obtain a paste suitable for carrying out the extrusion forming step b).
- the mixing step a) is preferably carried out in two steps.
- the small and large micrometric particles of alumina are advantageously dry mixed for a period of between 1 and 5 min and preferably between 2 and 4 min.
- the mixture is preferably made at using a mixer such as for example, a bezel or a rotating drum.
- the solid precursor of alumina and the acid in solution are then advantageously introduced into said dry mixture of micrometric alumina particles, in the form of a binder solution formed with the solid precursor of alumina dispersed in said acidic solution.
- the acid in solution and the solid precursor of alumina dispersed in said acid solution are advantageously introduced in a second step, using a spray nozzle, to ensure the contact between the components of the mixture. and allow the progressive agglomeration of micrometric alumina particles during rotation of the bezel or rotating drum.
- the addition in a second step of the solid precursor of alumina dispersed in the acid in solution makes it possible to ensure the shaping by wet granular growth during the granulation shaping step b).
- the shaping conditions are adjusted in a manner known to those skilled in the art and are aimed at obtaining spherical granules of desired size.
- step a) The mixture resulting from step a) is then shaped according to step b) of the process for preparing the material according to the invention.
- Step b) shaping makes it possible to obtain a green material.
- raw material is meant the material shaped and having not undergone any heat treatment steps.
- Said b) shaping step can advantageously be carried out by wet granulation or by extrusion.
- said shaping step b) is carried out by extrusion in a manner known to those skilled in the art.
- the mixture resulting from stage a), that is to say the paste resulting from stage a) advantageously passes through a die, for example using a piston or a continuous twin-screw or single-screw extruder.
- the diameter of the die is advantageously variable and is between 1 and 5 mm.
- the shape of the die, and therefore the form of the millimeter solid obtained in extruded form, is advantageously cylindrical, trilobal, quadrilobed or multilobed.
- the green material from step b) can therefore be in the form of granules or extrudates and preferably in the form of extrudates.
- step b) of the preparation process according to the invention is then subjected to the heat treatments of steps c) and d).
- step c) of the preparation process according to the invention the raw material obtained at the end of step b) undergoes a drying step.
- Said drying step c) is advantageously carried out according to the techniques known to those skilled in the art to evaporate in a controlled manner the solvent from the acid solution present in the material. shaped raw obtained after step b), and give a first solidification said material.
- the drying step c) may advantageously be carried out under vacuum or under air or in moist air, in one or more substeps of determined conditions of temperature, vacuum or gas.
- Said c) drying step is advantageously carried out at a temperature between 40 and 200 ° C, preferably between 50 and 150 ° C, and preferably between 70 and 100 ° C.
- the drying step c) is advantageously carried out for a period of between 12 and 72 hours, and preferably between 12 and 24 hours.
- Said drying step c) is advantageously carried out under ambient air or in moist air, with a water vapor content of between 20 and 100% by volume.
- step d) of the preparation process according to the invention the dried material obtained at the end of the drying step c) undergoes a calcination step.
- Said step d) of calcination is advantageously carried out according to the techniques known to those skilled in the art.
- Said step d) can be carried out under air or under air with steam, in one or more substeps of determined conditions of temperature or gas.
- Said d) calcination step is advantageously carried out at a temperature between 400 and 1000 ° C, preferably between 450 and 850 ° C, and preferably between 500 and 700 ° C.
- the d) calcination step is advantageously carried out for a period of between 1 to 6 hours and preferably between 2 and 3 hours, under ambient air or under air and steam.
- Said step d) of calcination is advantageously carried out under ambient air.
- Said step d) of calcination makes it possible to generate the binder constituted by aluminum phosphate and to ensure the cohesion of the hierarchical organization of small and large micrometric particles of alumina and thus of the material obtained by the preparation method according to the invention.
- the invention in particular by the conversion of the amorphous phase of aluminum phosphate formed after step a) of the preparation process according to the invention, mainly in a cristobalite-tridymite crystalline phase.
- the phase transformation allowing the formation of the cristobalite-tridymite crystalline phase also makes it possible to improve the adhesion between said micrometric particles of alumina and the binder consisting of aluminum phosphate.
- the material in the form of millimetric object according to the invention is obtained.
- material in the form of a millimeter object is meant a material having dimensions of the order of one millimeter.
- the material in the form of a millimetric object, preferably in extruded form, prepared according to the sequence of steps a), b), c) and d) of the preparation process according to the invention can be characterized according to the following techniques : nitrogen adsorption for the determination of the specific surface according to the BET method; mercury porosimetry for volume measurements mesoporous and macroporous and pore size distribution; scanning electron microscopy (SEM) for the microstructure analysis to observe the hierarchical organization and dimensions of the small and large micrometric alumina particles assembled by the aluminum phosphate binder; scanning electron microscopy (SEM) can also be coupled with EDS microanalysis (MEB-EDS) to visualize the location of phosphorus; a grain-to-grain crushing test for evaluating the mechanical strength of the material.
- nitrogen adsorption for the determination of the specific surface according to the BET method
- mercury porosimetry for volume measurements mesoporous and macroporous and pore size distribution
- SEM scanning
- the preparation method of the invention ensures the formation of said material but also:
- step b) a good flow of the mixture obtained in step a) during step b) which limits the generation of geometric defects and micrometric defects on the surface of the raw material thus improving the appearance and strength of the material as a millimetric object obtained according to the invention
- the formation of the defects related to the densification of the binder during steps c) and d) is minimized because of its location in the small space between the micrometric particles of alumina, which improves the mechanical strength of the material under millimetric object form obtained according to the invention.
- Example 1 preparation of an alumina-based material, in the form of a millimetric, porous obiet, with a hierarchical organization of two classes of micrometric particles assembled by a binder consisting of aluminum phosphate with a molar ratio P / Al of 0.8
- the large particle population consists of alumina Puralox Scfa-140 (Sasol). These particles have a BET specific surface area of 144 m 2 / g determined by nitrogen adsorption (ASAP 2420 - Micromeritics), a mesoporous volume of 0.45 mL / g and a median mesopore diameter of 11.5 nm determined by porosimetry. mercury (Autopore 9500 - Micromeritics). The median diameter, i.e., the Dv50 of said large particles is about 19 ⁇ m, the Dv10 is about 7 ⁇ m, and the Dv90 is about 38 ⁇ m, determined by laser diffraction particle size (Mastersizer 2000 - Malvem).
- the small micrometric alumina particles are obtained by spray drying of a boehmite sol prepared from the Pural powder SB3 (Sasol).
- the soil is prepared so as to obtain a mass ratio (mass of boehmite / mass of water) ⁇ 100 of 3.4% by weight and an acid level (mass of nitric acid / mass of alumina formed from boehmite after calcination) of 4.6% by weight.
- the powder Pural SB3 referenced (Sasol) is introduced into the acid solution, and the mixture is subjected to strong stirring for 2 hours. After the mixing time, the soil is centrifuged for 20 min at a speed of 4000 rpm to remove sediment of undispersed boehmite.
- the boehmite sol is then spray-dried using a laboratory spray dryer (Buchi B-290). Atomization conditions such as feed rate, compressed air flow, inlet and outlet temperatures, and suction flow are optimized to produce small spherical particles in the separation cyclone. the median diameter is about 2 ⁇ .
- the particles obtained by spray drying are then calcined in a muffle furnace at 600 ° C. for 2 hours in order to ensure the conversion of boehmite to gamma-alumina, and thus to obtain the small micrometric and spherical particles of alumina.
- Said small particles have, after calcination, a BET specific surface area of 212 m 2 / g determined by nitrogen adsorption (ASAP 2420 - Micromeritics), a mesoporous volume of 0.35 ml / g and a median mesopore diameter of 7, 5 nm, determined by mercury porosimetry (Autopore 9500 - Micromeritics).
- the median diameter, i.e., the Dv50 of said small particles is about 1.7 ⁇ m
- the Dv10 is about 0.75 ⁇ m
- the Dv90 is about 3.4 ⁇ m, determined by laser diffraction granulometry (Mastersizer 2000 - Malvern).
- the solid precursor of alumina, necessary for the formation of the binder consisting of aluminum phosphate, is the powder referenced Pural SB3 (Sasol), and it is a very reactive boehmite.
- the large micrometric particles (Puralox Scfa-140 - Sasol), the small micrometric particles obtained by spray drying of a boehmite sol, and the solid alumina precursor referenced Pural SB3 (Sasol), are dry blended in such a way that to obtain, respectively, the proportions of 80% and 20% by weight of large and small particles, and 19% by weight of solid precursor of alumina.
- the proportions of large and small particles are expressed in relation to the total amount of micrometric particles, and the proportion of solid precursor of alumina is expressed in relation to the total amount of solid.
- the dry blending is carried out using a cam blender (Brabender 50 EHT) at an arm rotation speed of 10 rpm for 2 minutes.
- a solution of phosphoric acid is introduced using a syringe pump, so as to obtain an acid ratio (mass of introduced phosphoric acid / mass of introduced alumina solid precursor) ⁇ 100 of 125, 4% by weight, which corresponds to a molar ratio P / Al of 0.8, where P comes from phosphoric acid and Al from the solid precursor of alumina.
- the water is added with the acid solution so as to obtain a cohesive, homogeneous and extrudable paste.
- the kneading is continued at a rotation speed of the arms of 16 revolutions / min for 30 minutes, after the end of the addition of the acid solution.
- the solution of phosphoric acid associated with the mechanical energy provided during the kneading make it possible to disperse the micrometer agglomerates of crystallites of the solid precursor of alumina and forming a binder consisting of an amorphous phase of aluminum phosphate.
- the high acid ratio employed also promotes the local formation of aluminum phosphate from the partial dissolution of the micrometric alumina particles.
- the paste obtained is shaped in a step b) using a piston extruder (MTS), equipped with a cylindrical die 3 mm in diameter and 6 mm in length, to form the millimeter object. .
- MTS piston extruder
- the extrudates are then dried in a ventilated oven at 80 ° C. for 16 hours under ambient air in a step c), in order to evaporate the solvent from the acidic solution.
- the dried extrudates are then calcined in a muffle furnace at 600 ° C. for 2 h under ambient air, in a d) calcination stage, in order to ensure the solidification of the material by the transformation of the amorphous phase of aluminum phosphate. binder in crystalline cristobalite-tridymite phases.
- the extrudates obtained are characterized according to the following techniques: nitrogen adsorption, for the determination of the BET specific surface area; mercury porosimetry for mesoporous and macroporous volume measurements and mesopore diameter distribution; by Scanning Electron Microscopy (SEM) (JEOL JSM 6340F) for the observation of the hierarchical organization of small and large micrometric particles of alumina and in particular the distance from one interface to another between said large particles (D large ) and from one interface to another between said small particles ( small D) and the surface percentage of small ( small S) and large particles ( large S) with respect to the total surface of the SEM image; by MEB coupled to EDS microanalysis (MEB-EDS) to visualize the phosphorus mapping within the material, and the grain-to-grain (GGE) crush test to determine the lateral crushing strength of the material.
- SEM Scanning Electron Microscopy
- MEB-EDS EDS microanalysis
- GGE grain-to-grain
- the material according to the invention obtained according to Example 1 has good mechanical strength due to the hierarchical organization of small and large particles assembled by a binder consisting of aluminum phosphate.
- the distances D gr0SS es and D pe tites and the surface percentages Sg rows and S pe tites are essential criteria for obtaining the hierarchical organization of said small and large particles and are consistent with those of the material of the invention.
- the textural properties of the material obtained are related to the textural properties of the micrometric alumina particles and are consistent with the expected properties of the material according to the invention.
- the hierarchical organization makes it possible to increase the mesoporous volume of the material, by maximizing the proportion of micron particles with respect to the binder content.
- the hierarchical organization also makes it possible to have good sliding of the small and large micrometric alumina particles relative to each other, which results in a low mixing torque of the order of 3 Nm.
- EXAMPLE 2 (according to the invention: preparation of an alumina-based material, in the form of a millimetric, highly porous object, with a hierarchical organization of two classes of micrometric particles assembled by a binder consisting of aluminum phosphate with a molar ratio P / Al of 0.8
- the large micrometric and porous alumina particles are obtained from calcination in a muffle furnace at 600 ° C. for 2 hours, under ambient air, with the Pural TH100 powder (Sasol), in order to convert the starting boehmite into alumina. gamma.
- the micrometric particles have, after calcination, a specific surface area of 142 m 2 / g determined by nitrogen adsorption (ASAP 2420 - Micromeritics), a mesoporous volume of 0.87 mlJg and a median diameter of the mesopores of 22.5 nm determined. by mercury porosimetry (Autopore 9500 - Micromeritics).
- the median diameter, i.e., the Dv50 of said large particles is about 40 ⁇ m, the Dv10 is about 15 ⁇ m, and the Dv90 is about 77 ⁇ m, determined by laser diffraction particle size (Mastersizer 2000 - Malvern).
- the small micrometric particles are obtained by spray drying of a boehmite sol prepared from the Pural powder 100 (Sasol).
- Said boehmite sol is prepared according to the same conditions described in Example 1; and the atomization parameters are optimized to produce in the separation cyclone small spherical particles having a median diameter of about 3 ⁇ m.
- the particles obtained by spray drying are subjected to the same heat treatment as Example 1, in order to ensure the conversion of boehmite to gamma-alumina, and thus to obtain small micrometric and spherical particles of alumina.
- These particles have, after calcination, a BET specific surface area of 130 m 2 / g determined by nitrogen adsorption (ASAP 2420 - Micromeritics), a mesoporous volume of 0.78 mUg and a median mesopore diameter of 23 nm, determined by mercury porosimetry (Autopore 9500 - Micromeritics).
- the median diameter, i.e., the Dv50 of said small particles is about 2.7 ⁇ m, the Dv10 is about 1.7 ⁇ m, and the Dv90 is about 8 ⁇ m, determined by particle size distribution.
- laser diffraction Mastersizer 2000 - Malvern).
- the solid precursor of alumina, necessary for the formation of the binder consisting of aluminum phosphate, is the powder referenced Pural TH100 (Sasol).
- the large micrometric particles obtained after calcination of the powder referenced Pural TH100 (Sasol), the small micrometric particles obtained by spray drying of a soil of boehmite, and the solid precursor of alumina referenced Pural ⁇ 100 (Sasol) are mixed dry in a step a) of mixing in the same proportions and under the same conditions described in Example 1.
- a solution of phosphoric acid is introduced in the same way as that described in Example 1, and in order to obtain an acid ratio (mass of introduced phosphoric acid / solid precursor mass of introduced alumina) ⁇ 100 of 125.4% by weight, which corresponds to a molar ratio P / Al of 0.8, where P comes from phosphoric acid and Al from the solid precursor of alumina.
- Example 1 The mixing is continued under the same conditions as in Example 1.
- the water is added with the acid solution so as to obtain a cohesive paste, homogeneous and extrudable.
- the paste obtained is then shaped according to the same conditions as in Example 1.
- extrudates are then dried and calcined according to the conditions described in Example 1; and characterized according to the same techniques described in the same example.
- the material according to the invention obtained according to Example 2 has good mechanical strength due to the hierarchical organization of small and large particles assembled by a binder consisting of aluminum phosphate.
- the distances D large and small D and the surface percentages S large and S pems are essential criteria for obtaining the hierarchical organization of said small and large particles and are consistent with those of the material of the invention.
- the textural properties of the material obtained are related to the textural properties of the micrometric alumina particles and are consistent with the expected properties of the material according to the invention.
- the hierarchical organization makes it possible to increase the mesoporous volume of the material, by maximizing the proportion of micrometric particles with respect to the binder content.
- the hierarchical organization also allows good sliding of the small and large micrometric alumina particles relative to each other which results in a low mixing torque of the order of 5 Nm.
- Example 3 preparation of a material based on alumina, in the form of a millimetric, porous object, with a hierarchical organization of three classes of micrometric particles assembled by a binder consisting of aluminum phosphate with a molar ratio P / Al of 0.8
- the large particles of alumina consist of two populations of particles whose median diameter is distinct, and which are identified as: a population of so-called lower fat particles and referenced Puralox Scfa-140 (Sasol) and a population of so-called larger particles , referenced Puralox SCCa 150/200 (Sasol).
- the characteristics of the alumina powder referenced Puralox Scfa-140 are described in Example 1.
- the alumina powder referenced Puralox SCCa 150/200 has a BET specific surface area of 199 m 2 / g determined by nitrogen adsorption ( ASAP 2420 - Micromeritics), a mesoporous volume of 0.43 mIg and a mesopore median diameter of 8.7 nm determined by mercury porosimetry (Autopore 9500 - Micromeritics).
- the median diameter, i.e., the Dv50 of said larger fat particles is about 160 ⁇ m
- the Dv10 is about 104 ⁇ m
- the Dv90 is about 247 ⁇ m, determined by laser diffraction particle size ( Mastersizer 2000 - Malvem).
- the small particles are obtained in the same manner as described in Example 1 and their characteristics are also described in the same example.
- the solid precursor of alumina is the boehmite referenced Pural SB3 (Sasol), also used in Example 1.
- the conditions for mixing the alumina particles with the solid alumina precursor and the acid solution, the mixing conditions, the extrusion shaping and the heat treatments, are identical to those described in Example 1, but with 4 powders instead of 3 powders.
- the proportions of coarse particles, that is to say of the whole of the coarse lower and upper coarse particles, and small micrometric particles of alumina are respectively 76% and 24% by weight, expressed relative to the total quantity of particles. micrometric, and the proportion of solid precursor of alumina is 13% by weight relative to the total amount of solid.
- the proportion of so-called smaller particles relative to the totality of large particles is 40% by weight.
- the ratio of acid (mass of introduced phosphoric acid) / (mass of solid precursor of alumina) ⁇ 100 used is 125.4% by weight, which corresponds to a molar ratio P / Al of 0.8, where P is derived from phosphoric acid and Al from the solid precursor of alumina.
- the material according to the invention obtained according to Example 3 has good mechanical strength due to the hierarchical organization of small and large particles assembled by a binder consisting of aluminum phosphate.
- the distances D large and small D and the surface percentages S large and small S are essential criteria for obtaining the hierarchical organization of said small and large particles and are consistent with those of the material of the invention.
- the textural properties of the obtained material are related to the textural properties of the micrometric alumina particles and are in accordance with the expected properties of the material according to the invention.
- the hierarchical organization makes it possible to increase the mesoporous volume of the material, by maximizing the proportion of micrometric particles with respect to the binder content.
- the hierarchical organization also makes it possible to have good sliding of the small and large micrometric particles of alumina with respect to each other, which results in a low mixing torque of the order of 8 Nm.
- Example 4 preparation of an alumina material, in the form of a millimetric, porous obet, with a single class of micrometric particles assembled by a binder consisting of aluminum phosphate with a molar ratio P / Al 0.8
- micrometric and porous alumina particles come from the powder Puralox SCfa-140 referenced (Sasol) whose characteristics are described in Example 1.
- the solid precursor of alumina is the boehmite referenced Pural SB3 (Sasol), also used in Example 1.
- the conditions for mixing the alumina particles with the solid alumina precursor and the acid solution, the mixing conditions, the extrusion shaping and the heat treatments, are identical to those described in Example 1, but with 2 powders instead of 3 powders.
- the proportions of micrometric particles of alumina and alumina solid precursor relative to the total amount of solid are respectively 74 and 26% by weight.
- the ratio of acid (mass of introduced phosphoric acid) / (mass of solid precursor of alumina) ⁇ 100 used is 125.4% by weight, which corresponds to a molar ratio P / Al of 0.8, where P is derived from phosphoric acid and Al from the solid precursor of alumina.
- a lower mechanical resistance is observed with respect to the materials of Examples 1, 2 and 3 according to the invention because of the presence of a single class of micrometric alumina particles, which also leads to a mesoporous volume and a BET surface. lower compared to the examples according to the invention.
- a higher macroporous volume is also observed because of the lack of hierarchical organization of small and large particles in this material.
- Examples 1 to 3 according to the invention having both a hierarchical organization of small and large particles of alumina and comprising a binder consisting of aluminum phosphate with a molar ratio P / Al specific, have increased mechanical properties compared to the material of the prior art (Example 4).
- the hierarchical organization also makes it possible to increase the mesoporous volume of the material, by maximizing the proportion of micrometric particles with respect to the binder content. Even higher textural properties can be achieved from the use of micrometer particles of high porosity alumina.
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Abstract
Description
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JP2014546595A JP2015500196A (ja) | 2011-12-14 | 2012-11-27 | マルチスケール構造を有し、かつ、良好な機械強度を有するリン酸アルミニウムバインダを含む、アルミナベースの材料、およびその調製方法 |
US14/365,322 US9227873B2 (en) | 2011-12-14 | 2012-11-27 | Material based on alumina, with a multiscale structure, comprising an aluminium phosphate binder with good mechanical strength, and process for its preparation |
EP12813404.6A EP2791079A1 (fr) | 2011-12-14 | 2012-11-27 | Materiau a base d'alumine, a structure multiechelle, comprenant un liant phosphate d'aluminium ayant une bonne resistance mecanique et son procede de preparation |
CN201280061707.2A CN104136394B (zh) | 2011-12-14 | 2012-11-27 | 具有优良机械强度的包含磷酸铝粘合剂的具有多尺度结构的氧化铝基材料,及其制备方法 |
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FR1103858A FR2984303B1 (fr) | 2011-12-14 | 2011-12-14 | Materiau a base d'alumine, a structure multiechelle, comprenant un liant phosphate d'aluminium ayant une bonne resistance mecanique et son procede de preparation |
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CN109052358A (zh) * | 2018-10-09 | 2018-12-21 | 湖南雅城新材料有限公司 | 一种介孔-大孔磷酸铁的制备方法 |
CN111639431A (zh) * | 2020-06-01 | 2020-09-08 | 扬州大学 | 二元颗粒混合物最小孔隙比预测方法 |
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JP6236647B2 (ja) * | 2014-02-26 | 2017-11-29 | 国立研究開発法人産業技術総合研究所 | アルミナ粒子 |
SG11201810208RA (en) * | 2016-05-16 | 2018-12-28 | Martinswerk Gmbh | Products and uses thereof |
US11091396B2 (en) | 2016-05-23 | 2021-08-17 | Sasol (Usa) Corporation | High strength shaped aluminas and a method of producing such high strength shaped aluminas |
EP3760602A4 (fr) * | 2018-02-28 | 2021-11-17 | Sumitomo Chemical Company Limited | Composition de particules |
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US3223537A (en) * | 1962-01-15 | 1965-12-14 | Aeronca Mfg Corp | Method for preparing foamed insulating material |
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NZ224209A (en) * | 1987-05-18 | 1990-10-26 | Mobil Oil Corp | Amorphous refractory composition as support for catalyst and its use in upgrading feedstock of petroleum residues |
FR2734812B1 (fr) * | 1995-05-31 | 1997-07-04 | Atochem Elf Sa | Procede de preparation de pieces foreuses en ceramique comprenant des plaquettes monocristallines d'alumine alpha |
CA2320485C (fr) * | 1998-12-08 | 2005-02-08 | Japan Energy Corporation | Catalyseur d'hydrodesulfuration et son procede de preparation |
FR2809496B1 (fr) * | 2000-05-23 | 2002-07-12 | Saint Gobain Vitrage | Couche diffusante |
FR2933088B1 (fr) * | 2008-06-27 | 2010-08-20 | Inst Francais Du Petrole | Procede de preparation d'une alumine a mesoporosite controlee |
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2011
- 2011-12-14 FR FR1103858A patent/FR2984303B1/fr not_active Expired - Fee Related
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2012
- 2012-11-27 JP JP2014546595A patent/JP2015500196A/ja active Pending
- 2012-11-27 US US14/365,322 patent/US9227873B2/en not_active Expired - Fee Related
- 2012-11-27 WO PCT/FR2012/000491 patent/WO2013088000A1/fr active Application Filing
- 2012-11-27 EP EP12813404.6A patent/EP2791079A1/fr not_active Withdrawn
- 2012-11-27 CN CN201280061707.2A patent/CN104136394B/zh not_active Expired - Fee Related
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US3223537A (en) * | 1962-01-15 | 1965-12-14 | Aeronca Mfg Corp | Method for preparing foamed insulating material |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109052358A (zh) * | 2018-10-09 | 2018-12-21 | 湖南雅城新材料有限公司 | 一种介孔-大孔磷酸铁的制备方法 |
CN111639431A (zh) * | 2020-06-01 | 2020-09-08 | 扬州大学 | 二元颗粒混合物最小孔隙比预测方法 |
CN111639431B (zh) * | 2020-06-01 | 2024-02-13 | 扬州大学 | 二元颗粒混合物最小孔隙比预测方法 |
Also Published As
Publication number | Publication date |
---|---|
US9227873B2 (en) | 2016-01-05 |
JP2015500196A (ja) | 2015-01-05 |
EP2791079A1 (fr) | 2014-10-22 |
FR2984303B1 (fr) | 2014-05-09 |
CN104136394A (zh) | 2014-11-05 |
US20140377561A1 (en) | 2014-12-25 |
FR2984303A1 (fr) | 2013-06-21 |
CN104136394B (zh) | 2016-03-30 |
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