CN106904629B - SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly and preparation method thereof - Google Patents
SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly and preparation method thereof Download PDFInfo
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 88
- 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 88
- 238000001338 self-assembly Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 150000001412 amines Chemical class 0.000 claims abstract description 57
- 239000011148 porous material Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 33
- 229910052710 silicon Inorganic materials 0.000 claims description 33
- 239000010703 silicon Substances 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- 238000002425 crystallisation Methods 0.000 claims description 30
- 230000008025 crystallization Effects 0.000 claims description 30
- 239000007864 aqueous solution Substances 0.000 claims description 29
- 239000000243 solution Substances 0.000 claims description 26
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 20
- 239000000377 silicon dioxide Substances 0.000 claims description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 17
- 239000011574 phosphorus Substances 0.000 claims description 17
- 229910052681 coesite Inorganic materials 0.000 claims description 13
- 229910052906 cristobalite Inorganic materials 0.000 claims description 13
- 229910052682 stishovite Inorganic materials 0.000 claims description 13
- 229910052905 tridymite Inorganic materials 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052593 corundum Inorganic materials 0.000 claims description 12
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 12
- OGTZRIQXVVJUHL-UHFFFAOYSA-N CO.[Cl-].C[NH+](CCCCCCCCCCCCCCCCCC)C Chemical compound CO.[Cl-].C[NH+](CCCCCCCCCCCCCCCCCC)C OGTZRIQXVVJUHL-UHFFFAOYSA-N 0.000 claims description 11
- 229910001868 water Inorganic materials 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims description 9
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims description 9
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical group O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 5
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 4
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 3
- 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 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- NAPSCFZYZVSQHF-UHFFFAOYSA-N dimantine Chemical compound CCCCCCCCCCCCCCCCCCN(C)C NAPSCFZYZVSQHF-UHFFFAOYSA-N 0.000 claims 1
- 150000002148 esters Chemical class 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 17
- 150000001336 alkenes Chemical class 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 238000003786 synthesis reaction Methods 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 7
- 239000003054 catalyst Substances 0.000 abstract description 6
- 238000000926 separation method Methods 0.000 abstract description 3
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 69
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 14
- 239000002245 particle Substances 0.000 description 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 7
- 239000003245 coal Substances 0.000 description 6
- 238000001000 micrograph Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 241000446313 Lamella Species 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- PFKRTWCFCOUBHS-UHFFFAOYSA-N dimethyl(octadecyl)azanium;chloride Chemical group [Cl-].CCCCCCCCCCCCCCCCCC[NH+](C)C PFKRTWCFCOUBHS-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000002336 sorption--desorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000005210 alkyl ammonium group Chemical group 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 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
- 238000009826 distribution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 239000002149 hierarchical pore Substances 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NNKSAZWMTWKXLD-UHFFFAOYSA-N n-methyloctadecan-1-amine;hydrochloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[NH2+]C NNKSAZWMTWKXLD-UHFFFAOYSA-N 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003348 petrochemical agent Substances 0.000 description 1
- 239000009260 qiming Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B37/00—Compounds having molecular sieve properties but not having base-exchange properties
- C01B37/06—Aluminophosphates containing other elements, e.g. metals, boron
- C01B37/08—Silicoaluminophosphates (SAPO compounds), e.g. CoSAPO
-
- 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
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
-
- B01J35/615—
-
- B01J35/617—
-
- B01J35/633—
-
- 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
- C01B39/54—Phosphates, e.g. APO or SAPO compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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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
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/45—Aggregated particles or particles with an intergrown morphology
-
- 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
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/20—Technologies relating to oil refining and petrochemical industry using bio-feedstock
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P30/00—Technologies relating to oil refining and petrochemical industry
- Y02P30/40—Ethylene production
Abstract
The present invention relates to SAPO-34 multistage porous molecular sieves of a kind of nanometer sheet vortex shape self assembly and preparation method thereof, the multistage porous molecular sieve is to be formed by the controllable SAPO-34 molecular sieve nanometer sheet of thickness in vortex shape arrangement self assembly, its have both piled up between SAPO-34 microporous molecular sieve and SAPO-34 molecular sieve nanoscale twins it is mesoporous, it is that organic amine template A and organic amine template B is added in hydrothermal synthesis system to prepare, have both SAPO-34 microporous molecular sieve and nanoscale twins pile up it is mesoporous, mesoporous pore size is piled up to nanoscale twins by adjusting nanoscale twins thickness to regulate and control, and then realize that SAPO-34 molecular sieve is adjustable, and catalyst of the invention has good catalytic performance, the selectivity of alkene can be improved in MTO reaction and extends catalyst service life, Its synthesis process is simple, and product is easy to collect, and without centrifuge separation, greatly simplifies process conditions, is conducive to industrial mass production.
Description
Technical field
The invention belongs to molecular sieve studying technological domains, and in particular to a kind of SAPO-34 of nanometer sheet vortex shape self assembly
Multistage porous molecular sieve and preparation method thereof.
Background technique
The energy resource structure feature in China determines that in the future for a long period of time coal is still China's energy-consuming
Main body, but conventional method utilize Coal Energy Source when again can with great pollution, therefore to coal high-efficiency clean conversion utilization
Just become emphasis, wherein being one of the emphasis of high-efficiency cleaning trans-utilization coal by ammonia from coal technique.According to statistics, by arriving
2015, China year methanol output to 60,000,000 tons, but annual but consumption is no more than 40,000,000 tons, this is resulted in
Serious excess capacity, it is therefore desirable to which new process is by superfluous methanol trans-utilization.
Methanol-to-olefins technology (MTO technology) is countries in the world all in the high-end core realm of development, it is to utilize methanol
Low-carbon alkene ethylene and propylene are obtained by methanol to olefins reaction for raw material, and ethylene and propylene are the bases of petrochemical industry
Stone, most petrochemicals are come out by ethylene and propylene derived, further according to China's richness coal and methanol mistake
Surplus national conditions have important practical significance so developing methanol-to-olefins technology.
SAPO-34 molecular sieve is the poromerics with CHA topological structure, because having suitable acid and duct knot
Structure shows good performance in methanol to olefins reaction.But SAPO-34 the problem of there is also itself, since duct is narrow
It is small, it is easy to carbon distribution occur and cause its inactivation.Therefore, people are attempting always different methods and are removing synthesis or modified SAPO-
34.Studies have shown that: preparing the SAPO-34 molecular sieve of small crystals (nano-scale) or multi-stage porous SAPO-34 molecular sieve is urged
Agent for MTO reaction have good olefine selective and longer catalytic life (CN102618610A, (Qiming Sun,
Ning Wang,Dongyang Xi,Miao Yang and Jihong Yu*.Organosilane surfactant-
directed synthesis of hierarchical porous SAPO-34catalysts with excellent MTO
Performance.Chem.Commun.2014,50,6502-6505.)), small crystals or nano-scale however are prepared now
SAPO-34 need to limit its industrial application by external conditions such as ultrasonic waves, and deposit obtained nano-scale point in post synthesis
Son sieve crystal is difficult to the problems such as isolated；Multi-stage porous SAPO-34 molecular sieve is then often by extremely complex organic of molecular structure
Structure directing agent synthesizes (Xiaochun Zhu, Jan P.Hofmann, Brahim Mezari, Nikolay as template
Kosinov,Leilei Wu,Qingyun Qian,Bert M.Weckhuysen,Shunsuke Asahina,Javier
Ruiz-Martínez,and Emiel J.M.Hensen*.Trimodal Porous Hierarchical SSZ-
13Zeolite with Improved Catalytic Performance in the Methanol-to-Olefins
Reaction.ACS catalysis.2016,6,2163-2177.), exploitation and application cost are higher.Therefore, as can developing
A kind of synthetic method is simple, product is easily isolated and participates in the excellent SAPO-34 preparation process of MTO reacting catalytic performance, must energy
Greatly push the development of methanol-to-olefins technology.
Summary of the invention
The purpose of the present invention is to provide a kind of SAPO-34 multistage porous molecular sieve of new nanometer sheet vortex shape self assembly,
Its nanoscale twins thickness can regulate and control within the scope of 30~140nm, have both SAPO-34 microporous molecular sieve and SAPO-34 molecular sieve is received
Rice lamella is piled up mesoporous, is a kind of multistage porous molecular sieve.
Meanwhile the present invention provides a kind of simple, the above-mentioned nanometer sheet vortex shape self assembly of rapid synthesis SAPO-34 is multistage
The method of porous molecular sieve.
To achieve the goals above, the technical scheme adopted by the invention is that:
The SAPO-34 multistage porous molecular sieve of this kind of nanometer sheet vortex shape self assembly, the SAPO-34 multistage porous molecular sieve are
It is formed by the controllable SAPO-34 molecular sieve nanometer sheet of thickness in vortex shape arrangement self assembly, has both SAPO-34 microporous molecular sieve
It is piled up between SAPO-34 molecular sieve nanoscale twins mesoporous.
It further limits, the SAPO-34 molecular sieve nanometer sheet thickness regulates and controls within the scope of 30~140nm.
It further limits, the SAPO-34 multistage porous molecular sieve is to be in by the controllable SAPO-34 molecular sieve nanometer sheet of thickness
Vortex shape arranges spherical structure made of self assembly, and outer dia is 1.5~5 μm.
It further limits, the BET specific surface area of the SAPO-34 multistage porous molecular sieve is 450~650m2.g-1, micropore ratio
Surface area is 400~600m2.g-1, Micropore volume is 0.15~0.25cm3.g-1, external surface area is 45~80m2.g-1, total hole
Holding is 0.40~0.60cm3.g-1, mesoporous pore size is 6~12nm, mesoporous 0.25~0.30cm of Kong Rongwei3.g-1。
A kind of preparation method of the SAPO-34 multistage porous molecular sieve of above-mentioned nanometer sheet vortex shape self assembly, by following
Step composition:
(1) by organic amine template A add deionized water dilute after, be added organic amine template B, at room temperature stir 0.1~
0.5 hour, be uniformly mixed liquid；
(2) silicon source, silicon source are slowly added to above-mentioned uniform mixed liquor, are stirred at room temperature 0.5~1 hour；It is added dropwise later
Phosphorus source, silicon source generate SiO by theoretical2Meter, silicon source generate Al by theoretical2O3Meter, phosphorus source generate P by theoretical2O5Meter, silicon
Source, silicon source, phosphorus source, the mol ratio of organic amine template A, organic amine template B and deionized water are as follows: SiO2: Al2O3: P2O5:
A:B:H2O=0.3~0.8:0.5~1.3:2~6:4~10:0.1~0.8:75~300, aged at room temperature 0.5~1 hour；
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is put
It sets in the homogeneous reactor that revolving speed is 4-20rpm, thermostatic crystallization under the conditions of 150~200 DEG C, crystallization time is 3~48 small
When, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous molecule
Sieve original powder；
(4) SAPO-34 multi-stage porous molecular screen primary powder is dry, it roasts 5~9 hours, removes organic at 500~600 DEG C
Amine template A and organic amine template B obtains the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly；
Above-mentioned organic amine template A is that concentration is 25~35% tetraethyl ammonium hydroxide aqueous solutions；Organic amine template B choosing
From concentration be 42wt%~60wt% dimethyl stearyl ammonium chloride methanol solution or concentration be 65wt% dimethyl ten
Eight alkyl ammonium chloride aqueous solutions；Silicon source in aluminium isopropoxide, aluminium hydroxide or aluminum sulfate any one；Silicon source is selected from orthosilicic acid
Any one in tetra-ethyl ester, silica solution, white carbon black or silicic acid；Phosphorus source is phosphate aqueous solution.
It further limits, above-mentioned silicon source, silicon source, phosphorus source, organic amine template A, organic amine template B and deionized water
Mol ratio are as follows: SiO2: Al2O3: P2O5: A:B:H2O=0.6~0.8:0.8~1.2:2~5:4~8:0.2~0.8:75~
200。
It further limits, homogeneous reactor revolving speed described in above-mentioned steps (3) is 4-10rpm, and thermostatic crystallization temperature is
160~180 DEG C；The thermostatic crystallization time is 12~40 hours.
It further limits, above-mentioned steps (4) are specifically: by SAPO-34 multi-stage porous molecular screen primary powder in 60~90 DEG C of conditions
Lower drying 5~8 hours roasts 5~8 hours at 550~600 DEG C, and heating rate is 1~5 DEG C/min, removes organic amine mould
Plate agent A and organic amine template B.
The SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly of the present invention, is added in hydrothermal synthesis system
Organic amine template A and organic amine template B preparation, by changing two kinds of moulds of organic amine template A and organic amine template B
Ratio between plate agent, nanoscale twins thickness can regulate and control within the scope of 30~140nm, have both SAPO-34 microporous molecular sieve and receive
Rice lamella is piled up mesoporous, is a kind of multistage porous molecular sieve.Compared with prior art, it is the advantages of molecular sieve of the present invention:
(1) sieve synthesis procedure of the invention is simple, mild condition, time are short, and product is easy to collect, without from
Heart separation, greatly simplifies process conditions, is conducive to industrial mass production, effectively overcomes common molecular sieve crystal difficulty separation
Problem.
(2) SAPO-34 molecular sieve of the invention is multistage porous molecular sieve, can be prepared by one-step synthesis, method letter
It is single, provide a kind of new way for preparing multi-stage porous SAPO-34 molecular sieve.
(3) the nanoscale twins thickness of SAPO-34 molecular sieve of the invention is adjustable, by adjusting nanoscale twins thickness to nanometer
Lamella is piled up mesoporous pore size and is regulated and controled, and then realizes that SAPO-34 molecular sieve is adjustable.
(4) catalyst prepared by the present invention has nano-scale, and has both SAPO-34 microporous molecular sieve and nanoscale twins
It piles up mesoporous, there is good catalytic performance, the selectivity of alkene can be improved in MTO reaction and extend catalyst using the longevity
Life.
Detailed description of the invention
Commercialization SAPO-34 of the Fig. 1 for sample 1~5 in embodiment and as a comparison (purchase in Tian Jinnan by contrast sample 6
Change catalyst Co., Ltd) X-ray diffraction spectrogram.
Fig. 2 is the N of sample 1 in embodiment 12Adsorption and desorption isotherms.
Fig. 3 is the electron scanning micrograph of sample 1 in embodiment 1.
Fig. 4 is the electron scanning micrograph of sample 2 in embodiment 2.
Fig. 5 is the electron scanning micrograph of sample 3 in embodiment 3.
Fig. 6 is the electron scanning micrograph of sample 4 in embodiment 4.
Fig. 7 is the electron scanning micrograph of sample 5 in embodiment 5.
Fig. 8 is the electron scanning micrograph that SAPO-34 (contrast sample 6) is commercialized in comparative example.
Specific embodiment
Technical solution of the present invention is further described below by experimental data and specific embodiment, but the hair
It is bright to be not limited only to following embodiment.
Embodiment 1
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.6:1.0:2:4:0.2:75, A are tetraethyl hydrogen-oxygen
Change ammonium (35wt% aqueous solution), B is dimethyl stearyl ammonium chloride (42% methanol solution).
(1) it weighs 11.769g tetraethyl ammonium hydroxide (35wt% aqueous solution), 0.405g deionized water and 3.302g is added
After dimethyl stearyl ammonium chloride methanol solution (42% methanol solution), stir 0.3 hour, be uniformly mixed liquid.
(2) 2.915g aluminium isopropoxide and 0.63g silica solution (aqueous silica solution containing 40wt%) are weighed, is added to above-mentioned
It in mixed liquor, is stirred at room temperature 1 hour, is added dropwise later 3.224g phosphoric acid (85wt% aqueous solution), aged at room temperature 1 hour；
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is put
It sets in homogeneous reactor, it is 15rpm that revolving speed, which is arranged, in homogeneous reactor, and in 180 ° of progress thermostatic crystallizations, crystallization time is 48 small
When, after the completion of crystallization, obtained product is subjected to 3 suction filtrations, washing, drying, obtains SAPO-34 multi-stage porous molecular screen primary
Powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 5 hours dry under the conditions of 90 DEG C, it is roasted 5 hours at 600 DEG C,
Heating rate is 5 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve, and it is labeled as sample 1.
The SAPO-34 multistage porous molecular sieve with the self assembly of nanometer sheet vortex shape that the above method is prepared, nanometer
Lamellar spacing is 100~140nm, and nanoscale twins self assembly particle size is 3~5 μm.
Embodiment 2
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.4:0.6:2:8:0.2:200, A are tetraethyl hydrogen
Amine-oxides (35wt% aqueous solution), B are dimethyl stearyl ammonium chloride (65wt% aqueous solution).
(1) it weighs 9.50g tetraethyl ammonium hydroxide (35wt% aqueous solution), 3.733g deionized water and 0.431g bis- is added
After methyl octadecyl ammonium chloride (65wt% aqueous solution), stir 0.3 hour, be uniformly mixed liquid.
(2) 0.58g aluminum sulfate is weighed (containing Al2O3For 99.95wt%) and 0.24g tetraethyl orthosilicate (98wt%), it is added
It into above-mentioned mixed liquor, is stirred at room temperature 0.5 hour, 0.65g phosphoric acid (85wt% aqueous solution) is added dropwise, aged at room temperature 0.5 is small
When.
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is put
It sets in homogeneous reactor, it is 10rpm that revolving speed, which is arranged, in homogeneous reactor, and in 200 DEG C of progress thermostatic crystallizations, crystallization time is 12 small
When, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous molecule
Sieve original powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 8 hours dry under the conditions of 65 DEG C, it is roasted 8 hours at 550 DEG C,
Heating rate is 2 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve, and it is labeled as sample 2.
The SAPO-34 multistage porous molecular sieve with the self assembly of nanometer sheet vortex shape that the above method is prepared, nanometer
Lamellar spacing is 50~100nm；Nanoscale twins self assembly particle size is about 3 μm.
Embodiment 3
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.8:1.0:6:10:0.2:300, A are tetraethyl hydrogen
Amine-oxides (25wt% aqueous solution) B is dimethyl stearyl ammonium chloride (60% methanol).
(1) weigh 39.769g tetraethyl ammonium hydroxide (25wt% aqueous solution), be added 6.214g deionized water and
After 11.166g dimethyl stearyl ammonium chloride methanol solution (60% methanol), stir 0.3 hour, be uniformly mixed liquid.
(2) 0.35g aluminium hydroxide and 0.12g white carbon black are weighed (containing SiO2For 90wt%), it is added in above-mentioned mixed liquor,
It is stirred at room temperature 1 hour, is added dropwise 2.646g phosphoric acid (85wt% aqueous solution), aged at room temperature 0.8 hour.
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is put
It sets in homogeneous reactor, it is 4rpm that revolving speed, which is arranged, in homogeneous reactor, and in 150 ° of progress thermostatic crystallizations, crystallization time is 24 small
When, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous molecule
Sieve original powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 8 hours dry under the conditions of 60 DEG C, it is roasted 6 hours at 580 DEG C,
Heating rate is 1 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve, and it is labeled as sample 3.
The SAPO-34 multistage porous molecular sieve for the nanometer sheet vortex shape self assembly that the above method is prepared, nanoscale twins
With a thickness of 80~120nm；Nanoscale twins self assembly particle size is about 1.5~3 μm.
Embodiment 4
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.6:1.2:6:8:0.27:150, A are tetraethyl hydrogen
Amine-oxides (35wt% aqueous solution), B are dimethyl stearyl ammonium chloride (60% methanol).
(1) it weighs 6.143g tetraethyl ammonium hydroxide (35wt% aqueous solution), 0.541g deionized water and 0.408g is added
After dimethyl stearyl ammonium chloride methanol solution (60% methanol), stir 0.3 hour, be uniformly mixed liquid.
(2) 0.913g aluminium isopropoxide and 0.1g silicic acid are weighed, is added in above-mentioned mixed liquor, is stirred at room temperature 0.5 hour, by
It is added dropwise to 2.52g phosphoric acid (85wt% aqueous solution), aged at room temperature 1 hour.
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is put
It sets in homogeneous reactor, it is 4rpm that revolving speed, which is arranged, in homogeneous reactor, and in 160 ° of progress thermostatic crystallizations, crystallization time is 3 hours,
After the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, SAPO-34 multi-stage porous molecular screen primary is obtained
Powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 8 hours dry under the conditions of 60 DEG C, it is roasted 5 hours at 600 DEG C,
Heating rate is 3 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve, and it is labeled as sample 4.
The SAPO-34 multistage porous molecular sieve for the nanometer sheet vortex shape self assembly that the above method is prepared, nanoscale twins
With a thickness of 30~60nm；Nanoscale twins self assembly particle size is about 2 μm or so.
Embodiment 5
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.6:1.0:2:4:0.2:75, A are tetraethyl hydrogen-oxygen
Change ammonium (35wt% aqueous solution), B is dimethyl stearyl ammonium chloride methanol solution (42% methanol solution).
(1) it weighs 11.769g tetraethyl ammonium hydroxide (35wt% aqueous solution), 0.405g deionized water and 3.302g is added
After dimethyl stearyl ammonium chloride methanol solution (42% methanol solution), stir 0.5 hour, be uniformly mixed liquid.
(2) 2.915g aluminium isopropoxide and 0.63g silica solution (aqueous silica solution containing 40wt%) are weighed, is added to above-mentioned
It in mixed liquor, is stirred at room temperature 1 hour, is added dropwise 3.224g phosphoric acid (85wt% aqueous solution), aged at room temperature 1 hour.
(3) it will be transferred in the stainless steel cauldron with polytetrafluoroethyllining lining after the mixed liquor after step (2) aging,
It is placed in homogeneous reactor, it is 15rpm that revolving speed, which is arranged, in homogeneous reactor, and in 150 ° of progress thermostatic crystallizations, crystallization time is 6 small
When, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous molecule
Sieve original powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 6 hours dry under the conditions of 90 DEG C, it is roasted 9 hours at 500 DEG C,
Heating rate is 3 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve, and it is labeled as sample 5.
The SAPO-34 multistage porous molecular sieve for the nanometer sheet vortex shape self assembly that the above method is prepared, nanoscale twins
With a thickness of 30~50nm；Nanoscale twins self assembly particle size is about 1.5~3 μm or so.
Embodiment 6
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.3:1.3:4:6:0.8:150, A are tetraethyl hydrogen
Amine-oxides (35wt% aqueous solution), B are dimethyl stearyl ammonium chloride methanol solution (42% methanol solution).
(1) it weighs 11.769g tetraethyl ammonium hydroxide (35wt% aqueous solution), 4.894g deionized water and 4.405g is added
After dimethyl stearyl ammonium chloride methanol solution (42% methanol solution), stir 0.5 hour, be uniformly mixed liquid.
(2) 2.525g aluminium isopropoxide and 0.0933g white carbon black are weighed (containing SiO2For 90wt%), it is added to above-mentioned mixed liquor
In, it is stirred at room temperature 0.5 hour, is added dropwise 4.298g phosphoric acid (85wt% aqueous solution), aged at room temperature 0.5 hour.
(3) it will be transferred in the stainless steel cauldron with polytetrafluoroethyllining lining after the mixed liquor after step (2) aging,
It is placed in homogeneous reactor, it is 15rpm that revolving speed, which is arranged, in homogeneous reactor, in 160 ° of progress thermostatic crystallizations, crystallization time 30
Hour, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous point
Son sieve original powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 6 hours dry under the conditions of 90 DEG C, it is roasted 9 hours at 500 DEG C,
Heating rate is 3 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve.
The SAPO-34 multistage porous molecular sieve for the nanometer sheet vortex shape self assembly that the above method is prepared, nanoscale twins
With a thickness of 90~130nm；Nanoscale twins self assembly particle size is about 1.5~4 μm.
Embodiment 7
Final silicon source, silicon source, the oxide of phosphorus source and organic amine template A, the organic amine template B for moving into reaction kettle
Mol ratio with deionized water is SiO2: Al2O3: P2O5: A:B:H2O=0.8:0.5:4:6:0.1:150, A are tetraethyl hydrogen
Amine-oxides (35wt% aqueous solution), B are dimethyl stearyl ammonium chloride methanol solution (42% methanol solution).
(1) it weighs 11.769g tetraethyl ammonium hydroxide (35wt% aqueous solution), 4.272g deionized water and 0.551g is added
After dimethyl stearyl ammonium chloride methanol solution (42% methanol solution), stir 0.5 hour, be uniformly mixed liquid.
(2) 0.363g aluminium hydroxide and 0.793g tetraethyl orthosilicate (98wt%) are weighed, is added in above-mentioned mixed liquor,
It is stirred at room temperature 0.5 hour, is added dropwise 4.298g phosphoric acid (85wt% aqueous solution), aged at room temperature 0.5 hour.
(3) it will be transferred in the stainless steel cauldron with polytetrafluoroethyllining lining after the mixed liquor after step (2) aging,
It is placed in homogeneous reactor, it is 15rpm that revolving speed, which is arranged, in homogeneous reactor, in 160 ° of progress thermostatic crystallizations, crystallization time 30
Hour, after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, obtain SAPO-34 multi-stage porous point
Son sieve original powder.
(4) SAPO-34 multi-stage porous molecular screen primary powder is 6 hours dry under the conditions of 90 DEG C, it is roasted 9 hours at 500 DEG C,
Heating rate is 3 DEG C/min, removes organic amine template A and organic amine template B, obtains nanometer sheet vortex shape self assembly
SAPO-34 multistage porous molecular sieve.
The SAPO-34 multistage porous molecular sieve for the nanometer sheet vortex shape self assembly that the above method is prepared, nanoscale twins
With a thickness of 60~100nm；Nanoscale twins self assembly particle size is about 2~4 μm.
By the SAPO-34 multi-stage porous sieve sample 1-5 of the nanometer sheet vortex shape self assembly in embodiment and as a comparison
The commercial goods SAPO-34 molecular sieve (buying is in Tianjin Nan Hua catalyst Co., Ltd) of sample 6 carries out X-ray diffraction comparison
Analysis, as a result as shown in Figure 1.
As shown in Figure 1, the SAPO-34 multi-stage porous molecule of the sample nanometer sheet vortex shape self assembly in each embodiment
Sieve all has typical SAPO-34 molecular sieve characteristic diffraction peak, and has similar crystallinity and purity with contrast sample 6.
By the SAPO-34 multi-stage porous sieve sample 1 of the nanometer sheet vortex shape self assembly in embodiment and contrast sample 6 into
Row N2The analysis of adsorption desorption Experimental Comparison, Adsorption and desorption isotherms are as shown in Figure 2.
From Fig. 2 comparison as can be seen that the N of the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly2Adsorption desorption etc.
Warm line has both I type and the isothermal feature of IV type, and in lower N2Divide (p/p0< 0.01) there is jumping, embody typical pores
The adsorpting characteristic of molecular sieve shows containing a large amount of microcellular structures in sample, in N2It divides and occurs one in 0.75~0.95 section
Hysteresis loop embodies typical capillary condensation phenomenon, shows containing a certain amount of big mesoporous in sample 1, is a kind of multi-stage porous point
Son sieve；The N of contrast sample 62Adsorption and desorption isotherms are typical I type adsorption isotherm, show that sample 6 is conventional micro-pore zeolite
Molecular sieve.
By the SAPO-34 multi-stage porous sieve sample 1 of nanometer sheet vortex shape self assembly of the invention and commercially available contrast sample 6
Specific surface area, hole hold parameter and be compared, as a result such as table 1, table 1 lists specific surface area and the hole of sample 1 and contrast sample 6
Hold parameter.
The specific surface area of 1 sample 1 of table and contrast sample 6 and hole hold parameter
From the comparison of table 1 as can be seen that the multi-stage porous with nanoscale twins vortex shape packing structure prepared by the present invention
SAPO-34 sieve sample 1 is maintaining micropore specific area similar with the business SAPO-34 of contrast sample 6 and micropore hole
It is a kind of multistage porous molecular sieve with biggish external surface area and mesopore volume other than appearance.
Again by the SAPO-34 multi-stage porous sieve sample 1-5 and comparative sample of the nanometer sheet vortex shape self assembly in embodiment
Product 6 are scanned electron microscope observation analysis, as a result as shown in figures 3-8.
Found out by the comparison of Fig. 3~8, multi-stage porous SAPO-34 molecular sieve prepared by the present invention is SAPO-34 molecular sieve nanometer
Lamella is in particle made of swirl shape self assembly, and lamellar spacing is uniform, and can be controlled by synthesis condition and realize nanometer sheet thickness
Degree regulates and controls within the scope of 30~140nm, and the size of self assembly particle regulates and controls in 1.5-5 μ m.
In order to verify nanometer sheet vortex shape self assembly of the invention SAPO-34 multistage porous molecular sieve catalytic effect, will
The sample 1 and contrast sample 6 that embodiment 1 obtains respectively take 500mg, and the particle of 40~60 mesh is made in tabletting, put into internal diameter and are
MTO reaction test is carried out in the stainless steel reaction pipe of 6mm.Methanol sample introduction is carried by carrier gas He, and He flow velocity is 30ml/min, constant temperature
25 DEG C, methanol quality air speed (WHSV) is 0.75h-1.After device connection, 1h is activated under the conditions of 550 DEG C under He atmosphere first, it
After be cooled to 450 DEG C, after temperature is stablized, open air intake valve, start sample introduction reaction, and with gas-chromatography on-line checking
(FL9790), fid detector, chromatographic column are KB-PLOT Q (30m × 0.32mm × 10 μm).When the conversion ratio of methanol is lower than
When 40%, stop sample introduction.MTO reaction test the results are shown in Table 2.
2 sample 1 of table and 6 catalysis methanol of contrast sample are converted to the reaction result of alkene
From table 2 it can be seen that the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly prepared by the present invention
It converts in catalysis methanol into olefins reaction process, compared to the SAPO-34 molecular sieve of commercialization, catalyst service life is mentioned
It is high by 24.0%, in addition, the selectivity of primary product (ethylene+propylene) improves 17.1%, therefore prepare through the invention
SAPO-34 hierarchical pore molecular sieve catalyst can be widely applied in industrial production.
Being analyzed respectively with above-mentioned identical experimental method 2~7 products therefrom of the other embodiment of the present invention can be true
Fixed, the BET specific surface area of present invention gained SAPO-34 multistage porous molecular sieve is 450~650m2.g-1, micropore specific area is
400~600m2.g-1, Micropore volume is 0.15~0.25cm3.g-1, external surface area is 45~80m2.g-1, total pore volume 0.40
~0.60cm3.g-1, mesoporous pore size is 6~12nm, mesoporous 0.25~0.30cm of Kong Rongwei3.g-1, therefore, obtained by the present invention
SAPO-34 multi-stage porous molecular sieve has nano-scale, and has both SAPO-34 microporous molecular sieve and nanoscale twins pile up mesoporous, tool
There is good catalytic performance, the selectivity of alkene can be improved in MTO reaction.
Claims (8)
1. a kind of SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly, it is characterised in that: the SAPO-34 is multistage
Porous molecular sieve is to be formed by the controllable SAPO-34 molecular sieve nanometer sheet of thickness in vortex shape arrangement self assembly, has both SAPO-34
It is piled up between microporous molecular sieve and SAPO-34 molecular sieve nanoscale twins mesoporous.
2. the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly according to claim 1, it is characterised in that:
The SAPO-34 molecular sieve nanometer sheet thickness regulates and controls within the scope of 30~140nm.
3. the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly according to claim 1 or 2, feature exist
In: the SAPO-34 multistage porous molecular sieve is to arrange self assembly in vortex shape by the controllable SAPO-34 molecular sieve nanometer sheet of thickness
Made of spherical structure, outer dia be 1.5~5 μm.
4. the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly according to claim 3, it is characterised in that:
The BET specific surface area of the SAPO-34 multistage porous molecular sieve is 450~650m2.g-1, micropore specific area be 400~
600m2.g-1, Micropore volume is 0.15~0.25cm3.g-1, external surface area is 45~80m2.g-1, total pore volume be 0.40~
0.60cm3.g-1, mesoporous pore size is 6~12nm, mesoporous 0.25~0.30cm of Kong Rongwei3.g-1。
5. the preparation method of the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly as described in claim 1, special
Sign is to comprise the steps of:
(1) after adding deionized water to dilute organic amine template A, organic amine template B is added, it is small to stir 0.1~0.5 at room temperature
When, be uniformly mixed liquid；
(2) silicon source, silicon source are slowly added to above-mentioned uniform mixed liquor, are stirred at room temperature 0.5~1 hour；Phosphorus source is added dropwise later,
Silicon source generates SiO by theoretical2Meter, silicon source generate Al by theoretical2O3Meter, phosphorus source generate P by theoretical2O5Meter, silicon source, aluminium
Source, phosphorus source, the mol ratio of organic amine template A, organic amine template B and deionized water are as follows: SiO2: Al2O3: P2O5: A:B:
H2O=0.3~0.8:0.5~1.3:2~6:4~10:0.1~0.8:75~300, aged at room temperature 0.5~1 hour；
(3) mixed liquor after step (2) aging is transferred in the stainless steel cauldron with polytetrafluoroethyllining lining, is placed on
Revolving speed is thermostatic crystallization under the conditions of 150~200 DEG C in the homogeneous reactor of 4-20rpm, and crystallization time is 3~48 hours, etc.
To after the completion of crystallization, after obtained product is repeatedly filtered, is washed, is dried, SAPO-34 multi-stage porous molecular screen primary is obtained
Powder；
(4) SAPO-34 multi-stage porous molecular screen primary powder is dry, it is roasted 5~9 hours at 500~600 DEG C, removes organic amine mould
Plate agent A and organic amine template B obtains the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly；
Above-mentioned organic amine template A is that concentration is 25~35% tetraethyl ammonium hydroxide aqueous solutions；Organic amine template B is selected from dense
The dimethyloctadecylammonium that the dimethyl stearyl ammonium chloride methanol solution or concentration that degree is 42wt%~60wt% are 65wt%
Ammonium chloride aqueous solution；Silicon source in aluminium isopropoxide, aluminium hydroxide or aluminum sulfate any one；Silicon source is selected from orthosilicic acid tetrem
Any one in ester, silica solution, white carbon black or silicic acid；Phosphorus source is phosphate aqueous solution.
6. the preparation method of the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly as claimed in claim 5, special
Sign is: the silicon source, silicon source, phosphorus source, the mol ratio of organic amine template A, organic amine template B and deionized water are as follows:
SiO2: Al2O3: P2O5: A:B:H2O=0.6~0.8:0.8~1.2:2~5:4~8:0.2~0.8:75~200.
7. the preparation method of the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly as claimed in claim 5, special
Sign is: homogeneous reactor revolving speed described in step (3) is 4-10rpm, and thermostatic crystallization temperature is 160~180 DEG C；Constant temperature is brilliant
Changing the time is 12~40 hours.
8. the preparation method of the SAPO-34 multistage porous molecular sieve of nanometer sheet vortex shape self assembly as claimed in claim 5, special
Sign is that step (4) are specifically: SAPO-34 multi-stage porous molecular screen primary powder is 5~8 hours dry under the conditions of 60~90 DEG C,
It is roasted 5~8 hours at 550~600 DEG C, heating rate is 1~5 DEG C/min, removes organic amine template A and Organic amine template
Agent B.
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| US7578987B2 (en) * | 2005-06-20 | 2009-08-25 | Uop Llc | Synthesis of SAPO-34 with essentially pure CHA framework |
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| CN1106715A (en) * | 1994-02-05 | 1995-08-16 | 中国科学院大连化学物理研究所 | Method of synthesizing aluminosilico-phosphate molecular sieve using double template agent |
| CN1693202A (en) * | 2005-04-14 | 2005-11-09 | 南京工业大学 | Process for prepareing SAPO-34 molecular siever |
| CN101279207A (en) * | 2008-05-20 | 2008-10-08 | 吉林大学 | Preparation of SAPO-34 molecular sieve film for selectively separating methane gas |
| CN102336413A (en) * | 2010-11-29 | 2012-02-01 | 中国科学院大连化学物理研究所 | Synthesis method of low-silicon SAPO-34 molecular sieves |
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