CN116062764A - Y-Y composite molecular sieve with core-shell structure, and preparation method and application thereof - Google Patents
Y-Y composite molecular sieve with core-shell structure, and preparation method and application thereof Download PDFInfo
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- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000002808 molecular sieve Substances 0.000 title claims abstract description 117
- 239000002131 composite material Substances 0.000 title claims abstract description 29
- 239000011258 core-shell material Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 78
- 239000000203 mixture Substances 0.000 claims description 56
- 239000011734 sodium Substances 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 29
- 239000003054 catalyst Substances 0.000 claims description 23
- 229910052708 sodium Inorganic materials 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 238000004517 catalytic hydrocracking Methods 0.000 claims description 13
- 238000002425 crystallisation Methods 0.000 claims description 12
- 230000008025 crystallization Effects 0.000 claims description 12
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 12
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000006229 carbon black Substances 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000000047 product Substances 0.000 description 37
- 238000006243 chemical reaction Methods 0.000 description 23
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 18
- 230000000052 comparative effect Effects 0.000 description 18
- 238000001035 drying Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 238000010335 hydrothermal treatment Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 238000001914 filtration Methods 0.000 description 9
- 239000008367 deionised water Substances 0.000 description 8
- 229910021641 deionized water Inorganic materials 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 6
- 238000011049 filling Methods 0.000 description 6
- 239000012467 final product Substances 0.000 description 6
- 238000007865 diluting Methods 0.000 description 5
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000002431 foraging effect Effects 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 2
- 238000005504 petroleum refining Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000872198 Serjania polyphylla Species 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/20—Faujasite type, e.g. type X or Y
- C01B39/24—Type Y
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
- B01J29/084—Y-type faujasite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/617—500-1000 m2/g
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/633—Pore volume less than 0.5 ml/g
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/16—After treatment, characterised by the effect to be obtained to increase the Si/Al ratio; Dealumination
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C01P2006/14—Pore volume
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The invention discloses a Y-Y composite molecular sieve with a core-shell structure, and a preparation method and application thereof. The specific surface area of the Y-Y composite molecular sieve is 800-1000 m 2 Per gram, the external specific surface area is 100-200 m 2 Per gram, the grain size of the shell layer of the outer surface is 100-300 nm, and the pore volume is 0.35-0.46 cm 3 And/g. The Y-Y composite molecular sieve has the characteristics of good hydrothermal stability, large external specific surface area, proper pore volume and the like.
Description
Technical Field
The invention belongs to the field of molecular sieves, and particularly relates to a Y-Y composite molecular sieve with a core-shell structure and a preparation method thereof.
Background
Zeolites have been widely used in a variety of fields such as catalysis, adsorption, etc. because of their large surface area, developed pore structure, high hydrothermal stability, and adjustability to acidity. Among them, Y-type molecular sieves have been widely used in the petroleum refining field. In the field of hydrocracking, Y-type molecular sieves have been used as the primary cracking component, exhibiting high cracking activity and good selectivity. The micron-sized Y-shaped molecular sieve has the particle size of about 1 mu m, pore canal size of 0.74nm multiplied by 0.74nm, has a three-dimensional twelve-membered ring structure, has larger grain size and small pore diameter, is unfavorable for the diffusion of reactant and product molecules, is easy to block at the pore opening, greatly reduces the effective utilization rate of an active center, and is unfavorable for the hydrocracking reaction. Compared with the conventional micron-sized Y-shaped molecular sieve, the nano-sized Y-shaped molecular sieve has high specific surface area and shorter diffusion pore channels, so that the intra-crystalline diffusion rate is effectively improved, the selectivity of the catalyst is improved, and the coking deactivation rate of the catalyst is also effectively reduced. When the nano-scale Y-type molecular sieve is loaded on the nuclear phase micro-scale Y-type molecular sieve, a multi-scale nano composite material with a core-shell structure is formed, and the structural function advantages of the micro-scale and nano-scale molecular sieve are combined to form the molecular sieve with a core-shell structure with gradient acid distribution and pore distribution, so that the molecular sieve has excellent performance in the petroleum refining process.
The core of the synthesized core-shell structure molecular sieve is that a layer of shell nano-scale molecular sieve with different components uniformly grows on the surface of the core-layer molecular sieve. At present, the preparation of the molecular sieve with the core-shell structure is mostly carried out in a synthesis process by using an organic template agent, adding seed crystals, sol-gel and other conditions.
CN104549459a discloses a composite molecular sieve, and its synthesis method and application, in which NaY molecular sieve is used as a nuclear phase, and the Y-Y composite molecular sieve with FAU-FAU structure is obtained through hydrothermal synthesis, and the synthesized product has poor hydrothermal stability, and the shell phase molecular sieve is easy to fall off. The obtained shell molecular sieve has smaller proportion, smaller pore volume and lower silicon-aluminum ratio. "A core-shell Y zeolite with a mono-crystalline core and a loosely aggregated polycrystalline shell: a hierarchical cracking catalyst for large reactants" (Yan chao Liu et Al, catalyst. Sci. Technology, 2044-4753,Volume 10,Issue 7,2020) discloses a method for preparing a Y-type molecular sieve with a core-shell structure, which uses an industrial NaY molecular sieve with Si/Al=2.5 as a core phase, prepares a directing agent by aging at 25 ℃, and crystallizes at 90 ℃ for 24 hours to obtain the Y-type molecular sieve with the core-shell structure. The crystallization process of the preparation method needs to add a certain amount of sulfuric acid, which is not beneficial to controlling the whole reaction system, and the obtained Y-shaped molecular sieve pore has smaller volume, which is not beneficial to the diffusion process of hydrocracking reaction macromolecules.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a Y-Y composite molecular sieve with a core-shell structure and a preparation method thereof.
The invention provides a Y-Y composite molecular sieve with a core-shell structure, wherein the specific surface area of the Y-Y composite molecular sieve is 800-1000 m 2 Per gram, the external specific surface area is 100-200 m 2 Per gram, the grain size of the shell layer of the outer surface is 100-300 nm, and the pore volume is 0.35-0.46 cm 3 /g。
The invention provides a preparation method of a Y-Y composite molecular sieve with a core-shell structure, which comprises the following steps:
(1) Mixing an aluminum source, a silicon source, sodium hydroxide and water, stirring, and aging to prepare a guiding agent;
(2) Mixing an aluminum source, sodium hydroxide and water, then mixing with an SSY molecular sieve, and stirring to obtain a mixture I; mixing a silicon source with water to obtain a mixture II; mixing the mixture II with the mixture I, and stirring to obtain mixed gel;
(3) Mixing the guiding agent prepared in the step (1) with the mixed gel prepared in the step (2), stirring, and crystallizing to obtain the Y-Y type molecular sieve with a core-shell structure.
In the method of the invention, the aluminum source, the silicon source, the sodium hydroxide and the water in the step (1) are fed according to the following molar ratio: al (Al) 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:20.0 to 35.0:8.6 to 32.5:323.1 to 650.0, preferably Al 2 O 3 :Na 2 O:SiO 2 :H 2 O＝1:24.3～33.9:10.0～25.6:359.5～600.3。
In the method of the invention, in the step (1), the stirring time is 30-120 min. The aging temperature is 20-50 ℃, preferably 20-40 ℃; the aging time is 3 to 24 hours, preferably 5 to 20 hours.
In the method of the invention, in the step (2), the aluminum source, sodium hydroxide, a silicon source and water are fed according to the following molar ratio: al (Al) 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:24.3 to 40.3:4.5 to 12.9:266 to 563, preferably 1:27.1 to 36.8:6.5 to 10.9:298 to 533. Wherein in the mixture II, the molar ratio of the silicon source and the water is SiO 2 :H 2 O＝1:13.2～33.6。
In the method, the aluminum sources in the step (1) and the step (2) are respectively and independently selected from one or more of aluminum sources such as aluminum chloride, aluminum sulfate, sodium metaaluminate, aluminum hydroxide and the like; the silicon sources in the step (1) and the step (2) are respectively and independently selected from one or more of water glass, silica sol, white carbon black and other silicon sources.
In the method, in the step (2), the SSY molecular sieve is a modified molecular sieve obtained by dealuminating and silicon supplementing the Y molecular sieve by ammonium fluosilicate. The specific surface area of the SSY molecular sieve is 650-850 m 2 Per gram, pore volume of 0.30-0.50 cm 3 And/g. The mass content of sodium oxide contained is less than 2.5% based on the total mass of the SSY molecular sieve.
In the method of the present invention, in the step (2), siO in the obtained mixed gel 2 Based on the mass of the SSY molecular sieve, the addition amount of the SSY molecular sieve accounts for SiO 2 8.5 to 35.7 percent of the mass, preferably 15.3 to 28.4 percent of the mass.
In the process according to the invention, in step (2), the stirring time after mixing of mixture II with mixture I is generally from 30 to 60 minutes, until the mixture assumes a milky gel state.
In the method of the invention, in the step (3), the mass of the added guiding agent is 4.5-25% of the mass of the mixed gel obtained in the step (2), and preferably 10-20%.
In the method of the present invention, in the step (3), the crystallization temperature is 80 to 150 ℃, preferably 90 to 120 ℃, and the crystallization time is 12 to 36 hours, preferably 16 to 28 hours.
In the process of the present invention, in step (3), after the crystallization reaction is completed, the Y-Y type molecular sieve product may be separated by any conventionally known separation means. Examples of the separation method include a method of filtering, washing and drying the obtained mixture. Here, the filtering, washing and drying may be performed in any manner conventionally known in the art. As a specific example, as the filtration, for example, the obtained product mixture may be simply suction-filtered. The washing may be performed using deionized water and/or ethanol, for example. The drying temperature may be, for example, 100 to 150 ℃, and the drying time may be, for example, 24 to 48 hours. The drying may be performed under normal pressure or under reduced pressure.
The invention provides an application of a Y-Y composite molecular sieve with a core-shell structure.
The Y-Y composite molecular sieve with the core-shell structure is used in a hydrocracking catalyst.
Compared with the prior art, the invention has the following advantages:
the core-shell structure Y-Y type molecular sieve has good hydrothermal stability, keeps good morphology and pore structure after being subjected to high-temperature hydrothermal treatment, can be used for preparing a hydrocracking catalyst carrier, and is beneficial to improving the yields of heavy naphtha and aviation kerosene.
Research results show that the SSY molecular sieve treated by ammonium fluosilicate is used as a nuclear phase molecular sieve, the nuclear phase molecular sieve is subjected to a hole expanding process, the surface of the nuclear phase molecular sieve is rich in silicon to form Si-O-Al bonds, surrounding silica-alumina gel is attracted to aggregate in the process of synthesizing a shell layer molecular sieve to form a primary structural unit, so that the shell phase Y-shaped molecular sieve is obtained, the outer surface area of the molecular sieve is effectively improved, the diffusion path of reactant molecules in the shell layer structure can be greatly shortened, and the smooth pore channel structure of the nuclear phase Y-shaped molecular sieve is beneficial to improving the diffusion efficiency of reactants and products.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) photograph of a composite product of example 1 of the present invention.
FIG. 2 is a Scanning Electron Microscope (SEM) photograph of a composite product of example 2 of the present invention.
FIG. 3 is a Scanning Electron Microscope (SEM) photograph of a composite product of comparative example 1 of the present invention.
FIG. 4 is a Scanning Electron Microscope (SEM) photograph of a composite product of comparative example 2 of the present invention.
FIG. 5 is a Scanning Electron Microscope (SEM) photograph of a composite product of comparative example 3 of the present invention.
FIG. 6 is a Scanning Electron Microscope (SEM) photograph of a composite product of comparative example 4 of the present invention.
Figure 7 is an XRD pattern of the synthetic product of example 1 of the invention.
FIG. 8 is an XRD pattern of the synthetic product of comparative example 5 of the present invention.
FIG. 9 is a Scanning Electron Microscope (SEM) photograph of the product obtained by hydrothermal treatment at 500℃for 1h of the synthetic product of example 1 of the present invention.
FIG. 10 is a Scanning Electron Microscope (SEM) photograph of the product obtained by hydrothermal treatment at 600℃for 1h of the synthetic product of example 1 of the present invention.
Detailed Description
The following examples further illustrate the preparation of the present invention, but are not intended to limit the invention.
In the present invention, XRD was measured by X-ray diffractometer of D/Max-2500 of RIGAKU Co., japan; n2 adsorption-desorption characterization was measured at ASAP 2420 from MICROMERITICS Inc., USA; SEM was a JEM-2100 (HR) type transmission electron microscope manufactured by JEOL corporation, japan.
Example 1
(1) Sodium metaaluminate, sodium hydroxide, sodium silicate and deionized water are mixed according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:28.9:18.7:532 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 25 ℃ for aging for 14h, and taking out for standby to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (the specific surface area of the SSY molecular sieve is 750.9m 2 Per gram, pore volume of 0.37cm 3 Per g, sodium oxide contained, based on the total mass of the SSY molecular sieveThe mass content is 1.81 percent) and is stirred at a high speed until the mixture is in a uniform state, so as to obtain a mixture I; diluting water glass with an aqueous solution to obtain a mixture II; wherein, in the total system, the molar ratio of sodium metaaluminate, sodium hydroxide, water glass and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:32.5:8.6:445, siO in mixture II 2 :H 2 O=1:20.8, pouring mixture II into mixture I, stirring at high speed for 45min until the mixture is in a milky gel state, to obtain a mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 18.9wt% of the mass;
(3) Adding the guiding agent prepared in the step (1) into the mixed gel prepared in the step (2), wherein the mass of the added guiding agent is 15% of the mass of the mixed gel prepared in the step (2), stirring for 60min, filling into a reaction kettle for sealing, placing at 100 ℃ for crystallization for 24h, filtering the product in the reaction kettle, and drying at 100 ℃ for 30h to obtain the final product. The SEM photograph of the obtained product is shown in fig. 1, and is a core-shell structure Y-Y type molecular sieve, and the XRD pattern of the obtained product is shown in fig. 7, and is a crystalline phase of the Y type molecular sieve.
The SEM photograph of the product obtained by the hydrothermal treatment at 500 ℃ for 1h is shown in figure 9, the SEM photograph of the product obtained by the hydrothermal treatment at 600 ℃ for 1h is shown in figure 10, and the appearance of the product after the hydrothermal treatment is basically unchanged.
Example 2
(1) Mixing sodium metaaluminate, sodium hydroxide, silica sol and water according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:25.9:18.7:532 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 35 ℃ for aging for 8 hours, and taking out for later use to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (the specific surface area of the SSY molecular sieve is 820.4 m) 2 Per gram, pore volume of 0.38cm 3 And/g, wherein the mass content of sodium oxide is 2.05 percent based on the total mass of the SSY molecular sieve, and stirring at a high speed until the sodium oxide is in a uniform state to obtain a mixture I; will beDiluting the silica sol with an aqueous solution to obtain a mixture II; wherein, in the total system, the mole ratio of sodium metaaluminate, sodium hydroxide, silica sol and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:34.8:10.5:435, siO in mixture II 2 :H 2 O=1:15.8, pouring mixture II into mixture I, stirring at high speed for 60min until the mixture is in a milky gel state, to obtain a mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 25.9wt% of mass;
(3) Adding the guiding agent prepared in the step (1) into the mixed gel, wherein the mass of the added guiding agent is 12% of the mass of the mixed gel prepared in the step (2), stirring for 60min, filling into a reaction kettle for sealing, placing at 100 ℃ for crystallization for 24h, filtering the product in the reaction kettle, and drying at 100 ℃ for 28h to obtain the final product. The SEM photograph of the obtained product is shown in figure 2, and is a core-shell structure Y-Y type molecular sieve.
Example 3
(1) Sodium metaaluminate, sodium hydroxide, white carbon black and water are mixed according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:32.9:24.7:489 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 20 ℃ for ageing for 20h, and taking out for standby to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (the specific surface area of the SSY molecular sieve is 783.2 m) 2 Per gram, pore volume of 0.37cm 3 And/g, wherein the mass content of sodium oxide is 1.79 percent based on the total mass of the SSY molecular sieve, and stirring at a high speed until the sodium oxide is in a uniform state to obtain a mixture I; diluting white carbon black with an aqueous solution to obtain a mixture II; wherein, in the total system, the molar ratio of sodium metaaluminate, sodium hydroxide, white carbon black and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:35.8:6.5:435, siO in mixture II 2 :H 2 O=1:32.8, pour mixture II into mixture I, stir at high speed for 90min until the mixture is a milky white gelObtaining mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 15.6wt% of the mass;
(3) And (3) adding the guiding agent prepared in the step (1) into the obtained mixed gel, wherein the mass of the added guiding agent is 18% of the mass of the mixed gel obtained in the step (2), stirring for 90min, filling into a reaction kettle for sealing, placing at 90 ℃ for crystallization for 28h, filtering the product in the reaction kettle, and drying at 100 ℃ for 32h to obtain the final product.
Example 4
(1) Sodium metaaluminate, sodium hydroxide, water glass and water according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:27.3:24.7:363.5 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 20 ℃ for ageing for 20 hours, and taking out for standby to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (specific surface area of the SSY molecular sieve is 803.5m 2 Per gram, pore volume of 0.39cm 3 And/g, wherein the mass content of sodium oxide is 2.11 percent based on the total mass of the SSY molecular sieve, and stirring at a high speed until the sodium oxide is in a uniform state to obtain a mixture I; diluting water glass with an aqueous solution to obtain a mixture II; wherein, in the total system, the molar ratio of sodium metaaluminate, sodium hydroxide, water glass and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:27.8:6.9:335, siO in mixture II 2 :H 2 O=1:16.8, pouring mixture II into mixture I, stirring at high speed for 60min until the mixture is in a milky gel state, to obtain a mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 15.9wt% of the mass;
(3) Adding the guiding agent prepared in the step (1) into the mixed gel, wherein the mass of the added guiding agent is 10% of the mass of the mixed gel prepared in the step (2), stirring for 90min, filling into a reaction kettle for sealing, placing at 120 ℃ for crystallization for 16h, filtering the product in the reaction kettle, and drying at 100 ℃ for 25h to obtain the final product.
Example 5
(1) Mixing sodium metaaluminate, sodium hydroxide, silica sol and water according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:20.9:18.7:532 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 40 ℃ for aging for 8 hours, and taking out for standby to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (the specific surface area of the SSY molecular sieve is 723.1m 2 Per gram, pore volume of 0.35cm 3 And/g, the mass content of sodium oxide contained in the SSY molecular sieve is 1.65 percent by weight, and the mixture is stirred at a high speed until the mixture is in a uniform state, so that a mixture I is obtained; diluting the silica sol with an aqueous solution to obtain a mixture II; wherein, in the total system, the mole ratio of sodium metaaluminate, sodium hydroxide, silica sol and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:30.8:9.5:335, siO in mixture II 2 :H 2 O=1:18.8, pouring mixture II into mixture I, stirring at high speed for 60min until the mixture is in a milky gel state, to obtain a mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 28.4wt% of the mass;
(3) Adding the guiding agent prepared in the step (1) into the mixed gel, wherein the mass of the added guiding agent is 10% of the mass of the mixed gel prepared in the step (2), stirring for 90min, filling into a reaction kettle for sealing, placing at 120 ℃ for crystallization for 18h, filtering the product in the reaction kettle, and drying at 100 ℃ for 30h to obtain the final product.
Comparative example 1
The guiding agent was prepared according to the formulation and procedure of example 1. Meanwhile, materials are added according to the material proportion of the embodiment 1, SSY molecular sieves are not added in the process, and other preparation steps are identical to the embodiment 1. The SEM photograph of the obtained product is shown in fig. 3.
Comparative example 2
According to example 1The guiding agent is prepared by the following steps. Simultaneously, materials are added according to the material proportion of the embodiment 1, and the SSY molecular sieve added in the process occupies SiO 2 5.3% by weight, the other preparation steps are identical to those of example 1. The SEM photograph of the obtained product is shown in fig. 4.
Comparative example 3
The guiding agent was prepared according to the formulation and procedure of example 1. Simultaneously, materials are added according to the material proportion of the embodiment 1, and the SSY molecular sieve added in the process occupies SiO 2 40wt% of the mass, the other preparation steps are identical to those of example 1. As shown in FIG. 5, the SEM photograph of the obtained product shows that the shell phase molecular sieve is not uniformly wrapped on the outer surface of the core phase molecular sieve, and is in a dispersed state.
Comparative example 4
The materials were added in the material proportions of example 1, the director aging temperature was 60℃and the aging time was 12 hours, the other preparation steps being identical to example 1. An SEM photograph of the obtained product is shown in fig. 6.
Comparative example 5
The material ratios were varied according to the experimental conditions of example 1.
(1) Sodium metaaluminate, sodium hydroxide, water glass and water according to Al 2 O 3 :Na 2 O:SiO 2 :H 2 Adding O=1:10.9:40.7:532 mol ratio into a container, stirring for 60min to a uniform state, sealing, standing at a constant temperature of 25 ℃ for aging for 14h, and taking out for standby to prepare a guiding agent;
(2) Dissolving sodium metaaluminate and sodium hydroxide with deionized water, and adding SSY molecular sieve (the specific surface area of the SSY molecular sieve is 750.9m 2 Per gram, pore volume of 0.37cm 3 And/g, wherein the mass content of sodium oxide is 1.81 percent based on the total mass of the SSY molecular sieve, and stirring at a high speed until the sodium oxide is in a uniform state to obtain a mixture I; diluting water glass with an aqueous solution to obtain a mixture II; wherein, in the total system, the molar ratio of sodium metaaluminate, sodium hydroxide, water glass and water is Al 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:32.5:8.6:445, siO in mixture II 2 :H 2 O＝1:20.8，Pouring the mixture II into the mixture I, and stirring at high speed for 45min until the mixture is in a milky gel state to obtain mixed gel; siO in the obtained mixed gel 2 Wherein the SSY molecular sieve is added in an amount based on the mass of SiO 2 18.9wt% of the mass;
(3) Adding the guiding agent prepared in the step (1) into the obtained mixed gel, wherein the mass of the added guiding agent is 15% of the mass of the mixed gel prepared in the step (2), stirring for 60min, filling into a reaction kettle for sealing, placing at 100 ℃ for crystallization for 24h, filtering the product in the reaction kettle, and drying at 100 ℃ for 30h to obtain the final product. The XRD pattern of the obtained product is shown in figure 8, and the molecular sieve synthesized under the condition has a hetero-phase P molecular sieve XRD peak, namely a P molecular sieve hetero-phase.
Table 1 properties of the synthesized molecular sieves of each of the examples and comparative examples
| Sample of | Specific surface area, m 2 /g | External specific surface area, m 2 /g | Pore volume, cm 3 /g | Grain size of outer surface shell layer, nm |
| Example 1 | 845.3 | 168.6 | 0.44 | 150 |
| Example 2 | 843.2 | 157.4 | 0.43 | 200 |
| Example 3 | 839.8 | 153.8 | 0.43 | 180 |
| Example 4 | 815.9 | 134.2 | 0.42 | 240 |
| Example 5 | 810.3 | 133.9 | 0.42 | 250 |
| Comparative example 1 | 413.2 | —— | 0.17 | Amorphous state |
| Comparative example 2 | 801.3 | —— | 0.33 | Amorphous state |
| Comparative example 3 | 861.2 | —— | 0.38 | Amorphous state |
| Comparative example 4 | 618.9 | —— | 0.24 | Amorphous state |
| Comparative example 5 | 741.3 | —— | 0.31 | With P molecular sieve impurity phase |
Table 2 properties of the synthetic molecular sieves of examples and comparative examples after hydrothermal treatment
The application of the core-shell structure Y-Y composite molecular sieve in the hydrocracking catalyst:
the pretreatment process of the core-shell structure Y-Y composite molecular sieve comprises the following steps: preparing 1.5mol/L ammonium nitrate solution, wherein the liquid-solid ratio is 1g/10ml, carrying out ammonium exchange treatment on the Y-Y composite molecular sieve at 80 ℃ for 1.0h each time, and exchanging for 2 times to obtain NH 4 Y-Y molecular sieve. For NH 4 And carrying out hydrothermal treatment on the Y-Y molecular sieve, wherein the hydrothermal treatment temperature is 600 ℃, the hydrothermal treatment time is 1 hour, and the pressure is controlled to be 0.1MPa, so as to obtain the SY-Y molecular sieve. Acid treatment of SY-Y molecular sievesPreparing 1.0mol/L nitric acid solution with a solid-liquid ratio of 1:10, and stirring for 1 hour at 90 ℃ to obtain the pretreated Y-Y type molecular sieve.
The preparation method of the catalyst comprises the following steps: uniformly mixing the Y-Y type molecular sieve obtained in the pretreated examples 1-5 and the SSY molecular sieve used in the example 1 of the invention with aluminum oxide, molybdenum oxide and nickel nitrate, uniformly rolling the powder under the action of an adhesive to prepare a hydrocracking catalyst, drying at 120 ℃ for 24 hours, putting into a muffle furnace, roasting at 500 ℃ for 3 hours to obtain the hydrocracking catalyst 1-6 respectively, wherein the catalyst comprises the following components: y molecular sieve (35 wt%), molybdenum oxide (18 wt%), nickel oxide (2 wt%), aluminum oxide (balance).
Catalyst evaluation conditions: the hydrocracking catalyst was presulfided and then placed in a 200mL small hydrocracking apparatus. The properties of the raw oil used in the experiment are shown in Table 3, and the evaluation process conditions are as follows: the pressure is 15.7MP, the liquid hourly space velocity (R1/R2) is 1.0/1.5h -1 The hydrogen oil volume ratio is 1500:1, and the conversion rate is 75wt%. The comparative results of the catalyst reaction performance are shown in Table 4. The raw oil sequentially passes through two beds of a hydrofining catalyst and a hydrocracking catalyst, and the organic nitrogen content of the raw oil in the hydrofining catalyst bed needs to be controlled<5ppm。
TABLE 3 Properties of raw oil
TABLE 4 catalyst product distribution
As can be seen from Table 4, when the conversion rate of the hydrocracking reaction is controlled to be the same, the reaction temperature is obviously lower than that of the catalyst prepared by adopting the nuclear phase Y-type molecular sieve in the embodiment, and the reaction temperature is 7-11 ℃ lower, which indicates that the catalyst prepared by taking the Y-Y composite molecular sieve of the invention as a cracking component has higher reaction activity. In the product distribution, the yield of heavy naphtha (65-177 ℃) and the yield of aviation kerosene (177-260 ℃) obtained by adopting the catalyst are obviously higher than those of the catalyst prepared by adopting the SSY molecular sieve. The modified Y-Y composite molecular sieve prepared by the method has better reactivity and selectivity performance of target products.
Claims (12)
1. A Y-Y composite molecular sieve with a core-shell structure is characterized in that: the specific surface area of the Y-Y composite molecular sieve is 800-1000 m 2 Per gram, the external specific surface area is 100-200 m 2 Per gram, the grain size of the shell layer of the outer surface is 100-300 nm, and the pore volume is 0.35-0.46 cm 3 /g。
2. A preparation method of a Y-Y composite molecular sieve with a core-shell structure comprises the following steps:
(1) Mixing an aluminum source, a silicon source, sodium hydroxide and water, stirring, and aging to prepare a guiding agent;
(2) Mixing an aluminum source, sodium hydroxide and water, then mixing with an SSY molecular sieve, and stirring to obtain a mixture I; mixing a silicon source with water to obtain a mixture II; mixing the mixture II with the mixture I, and stirring to obtain mixed gel;
(3) Mixing the guiding agent prepared in the step (1) with the mixed gel prepared in the step (2), stirring, and crystallizing to obtain the Y-Y type molecular sieve with a core-shell structure.
3. A method according to claim 2, characterized in that: in the step (1), the aluminum source, the silicon source, the sodium hydroxide and the water are fed according to the following molar ratio: al (Al) 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:20.0 to 35.0:8.6 to 32.5:323.1 to 650.0, preferably Al 2 O 3 :Na 2 O:SiO 2 :H 2 O＝1:24.3～33.9:10.0～25.6:359.5～600.3。
4. A method according to claim 2, characterized in that: in the step (1), the stirring time is 30-120 min.
5. A method according to claim 2, characterized in that: in the step (1), the aging temperature is 20-50 ℃, preferably 20-40 ℃; the aging time is 3 to 24 hours, preferably 5 to 20 hours.
6. A method according to claim 2, characterized in that: in the step (2), the aluminum source, the sodium hydroxide, the silicon source and the water are fed according to the following molar ratio: al (Al) 2 O 3 :Na 2 O:SiO 2 :H 2 O=1:24.3-40.3:4.5-12.9:266-563; wherein in the mixture II, the molar ratio of the silicon source and the water is SiO 2 :H 2 O＝1:13.2～33.6。
7. A method according to claim 2, characterized in that: the aluminum sources in the step (1) and the step (2) are respectively and independently selected from one or more of aluminum chloride, aluminum sulfate, sodium metaaluminate and aluminum hydroxide; the silicon sources in the step (1) and the step (2) are respectively and independently selected from one or more of water glass, silica sol and white carbon black.
8. A method according to claim 2, characterized in that: in the step (2), the SSY molecular sieve is a modified molecular sieve obtained by dealuminating and silicon supplementing the Y molecular sieve through ammonium fluosilicate; the specific surface area of the SSY molecular sieve is 650-850 m 2 Per gram, pore volume of 0.30-0.50 cm 3 /g; the mass content of sodium oxide contained is less than 2.5% based on the total mass of the SSY molecular sieve.
9. A method according to claim 2, characterized in that: in the step (2), siO in the obtained mixed gel 2 Based on the mass of the SSY molecular sieve, the addition amount of the SSY molecular sieve accounts for SiO 2 8.5 to 35.7 percent of the mass, preferably 15.3 to 28.4 percent of the mass.
10. A method according to claim 2, characterized in that: in the step (3), the mass of the added guiding agent is 4.5-25% of the mass of the mixed gel obtained in the step (2), and preferably 10-20%.
11. A method according to claim 2, characterized in that: in the step (3), the crystallization temperature is 80 to 150 ℃, preferably 90 to 120 ℃, and the crystallization time is 12 to 36 hours, preferably 16 to 28 hours.
12. Use of a Y-Y composite molecular sieve according to claim 1 or prepared according to any of claims 2 to 11 in a hydrocracking catalyst.
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