CN117427665B - Te modified mesoporous Al 2 O 3 Material, preparation method and application thereof - Google Patents
Te modified mesoporous Al 2 O 3 Material, preparation method and application thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 73
- 229910018072 Al 2 O 3 Inorganic materials 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 32
- 239000003054 catalyst Substances 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 28
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims abstract description 23
- 239000008103 glucose Substances 0.000 claims abstract description 23
- FXADMRZICBQPQY-UHFFFAOYSA-N orthotelluric acid Chemical compound O[Te](O)(O)(O)(O)O FXADMRZICBQPQY-UHFFFAOYSA-N 0.000 claims abstract description 23
- VKZRWSNIWNFCIQ-WDSKDSINSA-N (2s)-2-[2-[[(1s)-1,2-dicarboxyethyl]amino]ethylamino]butanedioic acid Chemical compound OC(=O)C[C@@H](C(O)=O)NCCN[C@H](C(O)=O)CC(O)=O VKZRWSNIWNFCIQ-WDSKDSINSA-N 0.000 claims abstract description 19
- 239000001509 sodium citrate Substances 0.000 claims abstract description 18
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims abstract description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 17
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 9
- 229910052714 tellurium Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 34
- -1 aluminum ions Chemical class 0.000 claims description 24
- 238000001035 drying Methods 0.000 claims description 17
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 15
- 238000001354 calcination Methods 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 35
- 239000000203 mixture Substances 0.000 description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000126 substance Substances 0.000 description 15
- 239000007787 solid Substances 0.000 description 13
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical compound CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 description 12
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- 229910004273 TeO3 Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 239000004005 microsphere Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000005720 sucrose Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OHVLMTFVQDZYHP-UHFFFAOYSA-N 1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-2-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical compound N1N=NC=2CN(CCC=21)C(CN1CCN(CC1)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)=O OHVLMTFVQDZYHP-UHFFFAOYSA-N 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- KRKNYBCHXYNGOX-UHFFFAOYSA-K Citrate Chemical compound [O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O KRKNYBCHXYNGOX-UHFFFAOYSA-K 0.000 description 1
- 238000003775 Density Functional Theory Methods 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 125000000185 sucrose group Chemical group 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/057—Selenium or tellurium; Compounds thereof
- B01J27/0576—Tellurium; Compounds thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The invention provides Te modified mesoporous Al 2 O 3 Material and preparation method and application thereof, belonging to the technical field of catalysts, and Te modified mesoporous Al 2 O 3 The material is prepared by taking an aluminum source, telluric acid, ammonia water, glucose, sodium citrate and ethylenediamine disuccinic acid as raw materials and adopting a precipitation method, has low raw material cost and simple process, and is suitable for industrial production. The Te modified mesoporous Al 2 O 3 The crystal form of the material is gamma-Al 2 O 3 Specific surface area of 300-600m 2 Per gram, pore volume of 0.50-1.50cm 3 /g, average pore size of 4-6nm, wherein TeO 3 The content is 0.1-15wt%, and Te element is uniformly distributed in Al 2 O 3 In the framework, thereby enhancing gamma-Al 2 O 3 The thermal stability of the material is suitable for preparing the supported catalyst.
Description
Technical Field
The invention belongs to the technical field of catalysts, and in particular relates to Te modified mesoporous Al 2 O 3 Materials, and methods of making and using the same.
Background
Because of the limitation of thermodynamic factors, the propane dehydrogenation catalytic reaction is carried out at high temperature, and the catalyst is easy to lose activity rapidly due to carbon deposition and sintering of active components in the reaction process, so that frequent regeneration is required. The physical properties of the catalyst carrier have a great influence on the performance of the catalyst, so how to prepare a more efficient catalyst carrier is also an important research direction. Alumina is an important propane dehydrogenation catalyst carrier because of its advantages of large specific surface area, high mechanical strength, good thermal stability, etc.
Alumina has various crystal forms, wherein alpha-Al is more common 2 O 3 、β-Al 2 O 3 、θ-Al 2 O 3 、γ-Al 2 O 3 And delta-Al 2 O 3 . Wherein, gamma-Al 2 O 3 Belongs to face-centered cubic lattice and is a defective spinel structure. gamma-Al 2 O 3 Has porous structure and large specific surface area, and has high chemical activity due to the acidic and basic groups contained in the surface, and is called as' active oxidationAluminum ", is commonly used in catalysts and adsorbents. The related studies are as follows: single-step hydrothermal synthesis of copper modified mesoporous gamma-Al (beta-Al) by using (A) Hui, cao Yufeng, yu Gongmei and the like 2 O 3 Study of adsorption desulfurization Performance [ J]Chemical engineering is applied, 2015 (1): 104-108. A one-step hydrothermal synthesis method is disclosed, al (NO) 3 ) 3 Is an aluminum source, P123 is a template agent, naOH and Na 2 CO 3 And K 2 CO 3 Respectively precipitants, cu (NO) 3 ) 2 Preparing ordered mesoporous gamma-Al of copper-loaded metal as copper source 2 O 3 . And the following documents: feng Zhiyu and Feng Qingqin mesoporous nanometer gamma-Al 2 O 3 Is prepared from (A) and its P-sulfate ion [ J ]]Henan science 2009, 27 (8): 924-926 discloses the preparation of mesoporous gamma-Al using cetyltrimethylammonium bromide, ammonium bicarbonate and aluminum nitrate as raw materials 2 O 3 The mesoporous nanometer gamma-Al 2 O 3 Has better adsorption performance to sulfate ions. In addition, patent CN111943242A discloses a mesoporous gamma-Al 2 O 3 Preparation method of carrier and mesoporous gamma-Al 2 O 3 The preparation method of the carrier specifically comprises the following steps: contacting the seed crystal with a mixed aqueous solution containing an aluminum source and a precipitant for hydrothermal reaction to obtain slurry; mixing the slurry with water, and then spray drying to obtain alumina precursor microspheres; and roasting the alumina precursor microspheres. The method of the invention can prepare gamma-Al 2 O 3 And the free modulation of the pore structure and the pore diameter of the catalyst carrier can be realized, so that the catalyst carrier with the pore structure suitable for various catalytic reaction systems is obtained.
But under the high temperature condition, gamma-Al 2 O 3 Will be more thermodynamically stable to alpha-Al 2 O 3 The transition leads to the rapid reduction of the specific surface area of the catalyst carrier, and the active components on the load are aggregated, so that the catalytic activity is reduced and the service life is shortened; moreover, the reduction of the specific surface area and pore volume of the carrier is also unfavorable for the mass transfer and heat transfer of the reaction. Therefore, research and development of novel alumina materials with high thermal stability and controllable morphology and structure are urgently needed.
In order to improve the stability, mechanical strength, surface chemical property and the like of the activated alumina, different synthesis methods can be adopted, modification and modification can be carried out on the activated alumina, and the comprehensive performance of the activated alumina serving as a catalyst carrier can be improved by changing the chemical composition and the internal tissue structure of the activated alumina.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides Te modified mesoporous Al 2 O 3 The material has high specific surface area and high heat stability, and is suitable for preparing supported catalyst.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides Te modified mesoporous Al 2 O 3 A material of mesoporous Al 2 O 3 The crystal form of the material is gamma-Al 2 O 3 Specific surface area of 300-600m 2 Per gram, pore volume of 0.50-1.50cm 3 /g, average pore size of 4-6nm, wherein TeO 3 The content is 0.1-15wt%, and Te element is uniformly distributed in Al 2 O 3 In the framework.
Preferably, the mesoporous Al 2 O 3 The crystal form of the material is gamma-Al 2 O 3 The specific surface area is 440.6-519.4m 2 Per gram, pore volume of 0.64-10.92cm 3 /g, average pore size of 4.9-5.5nm, wherein TeO 3 The content is 0.1-15wt%, and Te element is uniformly distributed in Al 2 O 3 In the framework.
Further, the mesoporous Al 2 O 3 The raw materials of the material comprise an aluminum source, glucose, telluric acid, sodium citrate and ethylenediamine disuccinic acid.
Further, the mesoporous Al 2 O 3 The raw materials of the material also comprise ammonia water.
Further, the aluminum source comprises aluminum nitrate and/or an aluminum sol.
Further, the concentration of aluminum ions in the aluminum source is 0.1-2.5M.
Preferably, the concentration of aluminum ions in the aluminum source is 2M or 1M.
Further, the molar ratio of glucose to aluminum ions is (0.1-3.0): 1; the molar ratio of tellurium ions to aluminum ions in the telluric acid is (0.0005-0.1): 1.
Preferably, the molar ratio of glucose to aluminum ions is (0.5-3.0): 1; the molar ratio of tellurium ions to aluminum ions in the telluric acid is (0.005-0.05): 1.
Further preferably, the molar ratio of glucose to aluminum ions is 2:1; the molar ratio of tellurium ions to aluminum ions in the telluric acid is 0.02:1.
Further, the molar ratio of the sodium citrate to the aluminum ions is (0.003-0.006): 1; the mole ratio of ethylenediamine disuccinic acid to aluminum ions is (0.003-0.006): 1.
Preferably, the molar ratio of sodium citrate to aluminum ions is 0.005:1; the molar ratio of ethylenediamine disuccinic acid to aluminum ions is 0.005:1.
Further, the invention provides the mesoporous Al 2 O 3 The preparation method of the material comprises the following steps: adding an aluminum source solution containing telluric acid into a glucose solution, and stirring for the first time; regulating pH, stirring, drying, and calcining.
Further, the primary stirring time is 2-24h, the continuous stirring time is 4-10h, the pH is 4.5-6, ammonia water is used for adjusting, the drying temperature is 100-200 ℃, and the roasting temperature is 600-800 ℃.
Preferably, the primary stirring time is 12-24h, the continuous stirring time is 5-10h, the pH is 4.5-6, ammonia water is used for adjusting, the drying temperature is 120-180 ℃, and the roasting temperature is 600-800 ℃.
In some specific embodiments, the mesoporous Al 2 O 3 The preparation method of the material comprises the following steps:
(1) Dissolving aluminum nitrate nonahydrate in water, and adding telluric acid to obtain an aluminum nitrate solution containing telluric acid;
(2) Adding an aluminum nitrate solution containing telluric acid into a glucose solution according to a proportion, adding sodium citrate and ethylenediamine disuccinic acid, and stirring for a certain time at room temperature to obtain a mixture A;
(3) Dropwise adding ammonia water into the mixture A in the step (2) to adjust the pH value of the system to a certain value, and continuously stirring for a certain time to obtain a mixture B;
(4) Putting the mixture B in the step (3) into an oven, drying at a constant temperature, and removing moisture and other volatile substances to obtain a solid;
(5) Calcining the solid obtained in the step (4) at a certain temperature in an air atmosphere to remove organic components, thereby obtaining the Te doped with gamma-Al 2 O 3 Modified material of the matrix.
Further, the invention also provides the mesoporous Al 2 O 3 Mesoporous Al prepared by the material or the preparation method 2 O 3 The material can be used to prepare a catalyst.
The invention has the technical effects that:
the modified alumina material prepared by the technical proposal of the invention is doped with Te in gamma-Al 2 O 3 In the matrix skeleton, on one hand, the specific surface area of the alumina material is larger, the pore channel structure is controllable, and the alumina material is used as a catalyst carrier, so that the catalyst active component can be better dispersed, and the catalytic activity is further improved; on the other hand, the modified alumina material has higher thermal stability, and is favorable for improving the stability of the catalyst when being used as a catalyst carrier.
Drawings
FIG. 1 shows the Te-modified gamma-Al obtained in example 1 2 O 3 An XRD diffractogram of (c);
FIG. 2 shows the Te-modified gamma-Al obtained in example 4 2 O 3 An XRD diffractogram of (i.e., an XRD diffractogram of the material of example 4 before firing);
FIG. 3 is an XRD diffraction pattern of the material of comparative example 1 before firing;
FIG. 4 is an XRD diffraction pattern of the material of comparative example 1 after calcination;
FIG. 5 is an XRD diffraction pattern of the material of example 4 after calcination;
FIG. 6 shows the Te modified in example 4Sex gamma-Al 2 O 3 The SEM electron microscope EDX mapping scanning image of (a) is Te element distribution, (b) is O element distribution, and (c) is Al element distribution.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Before the embodiments of the invention are explained in further detail, it is to be understood that the invention is not limited in its scope to the particular embodiments described below; it is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the raw materials used in the present invention are all common commercial products, and therefore the sources thereof are not particularly limited.
Example 1
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.0046g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; 3.603g of glucose was dissolved in 10ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.052g of sodium citrate and 0.058g of ethylenediamine disuccinic acid, and stirring at room temperature for 12 hours; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 4.5, and continuously stirring for 6 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 120 ℃; the obtained solid was calcined at 600℃in an air atmosphere to remove the organic components, thereby obtaining a material B1.
The prepared Te modified gamma-Al 2 O 3 The XRD diffractogram of (2) is specifically shown in fig. 1.
Example 2
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.0459g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; 7.206g of glucose was dissolved in 20ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.052g of sodium citrate and 0.058g of ethylenediamine disuccinic acid, and stirring at room temperature for 12 hours; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5, and continuously stirring for 6 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 150 ℃; the obtained solid was calcined at 700 ℃ in an air atmosphere to remove the organic components, thereby obtaining material B2.
Example 3
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and 0.1837g of telluric acid is added into an aluminum nitrate solution to obtain a solution 1; 10.810g glucose was dissolved in 30ml water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.031g of sodium citrate and 0.035g of ethylenediamine disuccinic acid, and stirring at room temperature for 12 hours; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 6 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 150 ℃; the obtained solid was calcined at 800℃in an air atmosphere to remove the organic components, thereby obtaining a material B3.
Example 4
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and 0.2296g of telluric acid is added into an aluminum nitrate solution to obtain a solution 1; 14.413g of glucose was dissolved in 40ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.052g of sodium citrate and 0.058g of ethylenediamine disuccinic acid, and stirring at room temperature for 18h; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 700℃in an air atmosphere to remove the organic components, thereby obtaining material B4.
The prepared Te modified gamma-Al 2 O 3 The XRD diffractogram of (i.e. the XRD diffractogram of the material of example 4 before firing) is shown in particular in figure 2;
the prepared Te modified gamma-Al 2 O 3 As can be seen from the SEM electron microscope EDX mapping scan of FIG. 6, te element is uniformly distributed in Al 2 O 3 In the framework.
Example 5
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and 0.3674g of telluric acid is added into an aluminum nitrate solution to obtain a solution 1; 21.619g of glucose was dissolved in 60ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.062g of sodium citrate and 0.070g of ethylenediamine disuccinic acid, and stirring at room temperature for 24 hours; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 6, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 800℃in an air atmosphere to remove the organic components, thereby obtaining a material B5.
Example 6
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and 0.4593g of telluric acid is added into an aluminum nitrate solution to obtain a solution 1; 14.413g of glucose was dissolved in 40ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.052g of sodium citrate and 0.058g of ethylenediamine disuccinic acid, and stirring at room temperature for 12 hours; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 10 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 150 ℃; the obtained solid was calcined at 800℃in an air atmosphere to remove the organic components, thereby obtaining material B6.
Comparative example 1
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water to obtain a solution 1; then 14.413g of glucose is dissolved in 40ml of water to obtain solution 2; adding the solution 1 into the solution 2, and adding 0.052gSodium citrate, 0.058g ethylenediamine disuccinic acid, stirring at room temperature for 18h; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; calcining the obtained solid at 700 ℃ in air atmosphere to remove organic components to obtain gamma-Al 2 O 3 Labeled material A1.
Comparative example 2
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.184g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; 14.472g of glucose was dissolved in 40ml of water to obtain solution 2; adding the solution 1 into the solution 2, and stirring for 18 hours at room temperature; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 700℃in an air atmosphere to remove the organic components, thereby obtaining material A2.
That is, the difference compared to example 4 is only that sodium citrate, ethylenediamine disuccinic acid are replaced with an equimolar amount of glucose.
Comparative example 3
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.184g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; adding the solution 1 into 40mL of water, adding 20.743g of sodium citrate, and stirring at room temperature for 18h; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 700℃in an air atmosphere to remove the organic components, thereby obtaining material A3.
That is, the difference compared to example 4 is only that glucose, ethylenediamine disuccinic acid are replaced with an equimolar amount of sodium citrate.
Comparative example 4
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.184g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; adding the solution 1 into 40mL of water, adding 23.477g of ethylenediamine disuccinic acid, and stirring at room temperature for 18h; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 700℃in an air atmosphere to remove the organic components, thereby obtaining material A4.
That is, the difference compared to example 4 is only that glucose, sodium citrate are replaced with equimolar amounts of ethylenediamine disuccinic acid.
Comparative example 5
15.005g of aluminum nitrate nonahydrate is dissolved in 20ml of water, and then 0.184g of telluric acid is added into the aluminum nitrate solution to obtain solution 1; 14.413g of sucrose was dissolved in 40ml of water to obtain solution 2; adding the solution 1 into the solution 2, adding 0.1168g of ethylenediamine tetraacetic acid, and stirring at room temperature for 18h; dropwise adding ammonia water into the obtained mixture to adjust the pH value of the system to 5.5, and continuously stirring for 8 hours; placing the obtained mixture into an oven, and drying water and other volatile substances at 180 ℃; the obtained solid was calcined at 700℃in an air atmosphere to remove the organic components, thereby obtaining material A5.
That is, the difference from example 4 is that glucose is replaced with sucrose in an equimolar amount, and sodium citrate and ethylenediamine disuccinic acid are replaced with ethylenediamine tetraacetic acid in an equimolar amount.
Material performance experiment one:
pore structure parameter analysis of the samples in the experiments was performed on a JW-TB series specific surface and pore size analyzer purchased from beijing micro-advanced high-bos scientific technology limited. The sample was vacuum degassed at 350 ℃ for 4 hours before measurement, the specific surface area of the sample was calculated by BET method, the pore volume was calculated by BJH model, and the pore size distribution was analyzed by DFT method.
The above materials A1 to A5 and B1 to B6 were subjected to nitrogen adsorption and desorption experiments, and the results are shown in Table 1:
TABLE 1 results of surface Properties of samples of examples of the invention
| Numbering device | Material | Specific surface area (m 2/g) | Pore volume (cm 3/g) | Average pore diameter (nm) | TeO3 content (%) |
| Example 1 | B1 | 440.6 | 0.64 | 5.2 | 0.13 |
| Example 2 | B2 | 478.5 | 0.78 | 5.5 | 1.55 |
| Example 3 | B3 | 490.4 | 0.84 | 4.9 | 6.29 |
| Example 4 | B4 | 512.2 | 0.98 | 5.6 | 7.86 |
| Example 5 | B5 | 464.7 | 0.69 | 5.4 | 12.50 |
| Example 6 | B6 | 519.4 | 0.92 | 5.5 | 15.67 |
| Comparative example 1 | A1 | 362.5 | 0.55 | 4.8 | 0 |
| Comparative example 2 | A2 | 405.6 | 0.78 | 5.1 | 7.03 |
| Comparative example 3 | A3 | 327.1 | 0.65 | 4.7 | 6.32 |
| Comparative example 4 | A4 | 415.5 | 0.64 | 4.5 | 5.04 |
| Comparative example 5 | A5 | 423.8 | 0.72 | 4.8 | 5.15 |
As can be seen from Table 1, compared with the non-doped Te alumina material, the Te doped modified alumina material prepared by the method provided by the invention has larger specific surface area and controllable pore channel structure, and the modified material is used as a catalyst carrier, thereby being beneficial to better dispersing the catalyst active component and further improving the catalytic activity.
Material performance experiment one:
to examine the thermal stability of the above modified alumina materials, materials A1 to A5, materials B1, B4, and B6 were calcined at 1000 ℃ for 2 hours, and then subjected to nitrogen adsorption and desorption experiments, and the obtained results are shown in table 2:
TABLE 2 thermal stability results for samples of examples of the invention
| Numbering device | Material | Specific surface area (m 2/g) | Pore volume (cm 3/g) | Average pore diameter (nm) | TeO3 content (%) |
| Example 1 | After calcination B1 | 418.7 | 0.59 | 5.6 | 0.11 |
| Example 4 | Post-roasting B4 | 500.7 | 0.91 | 6.0 | 7.84 |
| Example 6 | Post-roasting B6 | 505.6 | 0.87 | 6.1 | 15.51 |
| Comparative example 1 | After calcination A1 | 183.8 | 0.36 | 9.2 | 0 |
| Comparative example 2 | After calcination A2 | 219.4 | 0.53 | 8.9 | 5.35 |
| Comparative example 3 | After calcination A3 | 163.3 | 0.39 | 10.2 | 3.12 |
| Comparative example 4 | After calcination A4 | 198.5 | 0.30 | 9.3 | 2.90 |
| Comparative example 5 | After calcination A5 | 233.8 | 0.35 | 10.9 | 2.54 |
As can be seen from Table 2, after the material A1 is baked at 1000 ℃ for 2 hours, the specific surface area is obviously reduced, the pore volume and the average pore diameter are changed, and after the material A2-A5 is baked at 1000 ℃ for 2 hours, the specific surface area is obviously reduced, and the pore volume is flatPore size and TeO 3 The contents are changed, and the materials B1, B4 and B6 are baked for 2 hours at 1000 ℃ and then have specific surface area, pore volume, average pore diameter and TeO 3 The content is not obvious, and especially the material B4 is basically unchanged. Compared with the non-doped Te alumina material, the Te doped modified alumina material prepared by the method provided by the invention has better thermal stability, and is beneficial to improving the stability of the catalyst when being used as a catalyst carrier.
As can be seen from comparison of fig. 2 to 5, the crystal structure of the non-Te doped alumina material A1 is changed from gamma phase to delta phase after roasting at 1000 ℃ for 2 hours, and the crystal structure is changed obviously; while Te-doped modified alumina material B4 is still gamma-Al after being roasted for 2 hours at 1000 DEG C 2 O 3 The crystal phase further proves that the Te doped modified alumina material has better thermal stability and is very suitable for being used as a catalyst carrier.
In conclusion, the modified alumina material prepared by the technical proposal of the invention is doped with Te in gamma-Al 2 O 3 In the matrix framework, the specific surface area of the alumina material is larger, the pore channel structure is controllable, and the alumina material is used as a catalyst carrier, so that the catalyst active component can be better dispersed, and the catalytic activity is further improved; meanwhile, the modified alumina material has higher thermal stability, and is favorable for improving the stability of the catalyst when being used as a catalyst carrier.
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (9)
1. Te modified mesoporous Al 2 O 3 The material is characterized in that: the mesoporous Al 2 O 3 The crystal form of the material is gamma-Al 2 O 3 Specific surface area of 300-600m 2 Per gram, pore volume of 0.50-1.50cm 3 /g, average pore size of 4-6nm, wherein TeO 3 The content is 0.1-15wt%, and Te element is uniformly distributed in Al 2 O 3 In the framework;
the raw materials comprise an aluminum source, glucose, telluric acid, sodium citrate and ethylenediamine disuccinic acid.
2. Mesoporous Al according to claim 1 2 O 3 The material is characterized in that: the aluminum source comprises aluminum nitrate.
3. Mesoporous Al according to claim 1 2 O 3 The material is characterized in that: the concentration of aluminum ions in the aluminum source was 1M.
4. The mesoporous Al according to claim 3 2 O 3 The material is characterized in that: the molar ratio of the sodium citrate to the aluminum ions is (0.003-0.006): 1; the mole ratio of ethylenediamine disuccinic acid to aluminum ions is (0.003-0.006): 1.
5. The mesoporous Al according to claim 3 2 O 3 The material is characterized in that: the molar ratio of the glucose to the aluminum ions is (0.5-3.0): 1; the molar ratio of tellurium ions to aluminum ions in the telluric acid is (0.005-0.05): 1.
6. Mesoporous Al according to claim 5 2 O 3 The material is characterized in that: the molar ratio of the glucose to the aluminum ions is 2:1; the molar ratio of tellurium ions to aluminum ions in the telluric acid is 0.02:1.
7. Mesoporous Al according to any one of claims 1 to 4 2 O 3 The preparation method of the material is characterized by comprising the following steps: the method comprises the following steps: adding an aluminum source solution containing telluric acid into a glucose solution, and stirring for the first time; regulating pH, stirring, drying, and calcining.
8. The method of manufacturing according to claim 7, wherein: the primary stirring time is 12-24h, the continuous stirring time is 5-10h, the pH is 4.5-6, ammonia water is used for adjusting, the drying temperature is 120-180 ℃, and the roasting temperature is 600-800 ℃.
9. The mesoporous Al according to any one of claims 1 to 6 2 O 3 Material or mesoporous Al prepared by the preparation method of any one of claims 7 to 8 2 O 3 The application of the material in preparing the catalyst.
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| CN110642280A (en) * | 2019-11-09 | 2020-01-03 | 王杰 | alpha-Al2O3Nanotube and method for preparing the same |
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| CN1473654A (en) * | 2002-08-06 | 2004-02-11 | 中国科学院大连化学物理研究所 | Composite oxide catalyst and its preparing method and use |
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