CN108722476A - 一种lta型磷酸硅铝分子筛的合成方法及由其制备的催化剂 - Google Patents
一种lta型磷酸硅铝分子筛的合成方法及由其制备的催化剂 Download PDFInfo
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- CN108722476A CN108722476A CN201810542679.5A CN201810542679A CN108722476A CN 108722476 A CN108722476 A CN 108722476A CN 201810542679 A CN201810542679 A CN 201810542679A CN 108722476 A CN108722476 A CN 108722476A
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- molecular sieves
- quaternary ammonium
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- ammonium hydroxide
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 37
- 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 37
- 239000003054 catalyst Substances 0.000 title claims abstract description 5
- 238000010189 synthetic method Methods 0.000 title abstract description 9
- 239000002608 ionic liquid Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 18
- 125000001453 quaternary ammonium group Chemical group 0.000 claims abstract description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000908 ammonium hydroxide Substances 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 16
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002425 crystallisation Methods 0.000 claims abstract description 13
- 230000008025 crystallization Effects 0.000 claims abstract description 13
- 239000011541 reaction mixture Substances 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 13
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 9
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 5
- 239000011737 fluorine Substances 0.000 claims abstract description 5
- 239000011574 phosphorus Substances 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical group F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 8
- 150000002500 ions Chemical class 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 7
- -1 phosphine ion Chemical class 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical group [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- LPSKDVINWQNWFE-UHFFFAOYSA-M tetrapropylazanium;hydroxide Chemical compound [OH-].CCC[N+](CCC)(CCC)CCC LPSKDVINWQNWFE-UHFFFAOYSA-M 0.000 claims description 5
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 3
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 claims description 3
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims description 2
- 239000005995 Aluminium silicate Substances 0.000 claims description 2
- 239000004254 Ammonium phosphate Substances 0.000 claims description 2
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Natural products P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 claims description 2
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical group [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 claims description 2
- 235000012211 aluminium silicate Nutrition 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims description 2
- 235000019289 ammonium phosphates Nutrition 0.000 claims description 2
- 229910001593 boehmite Inorganic materials 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000017 hydrogel Substances 0.000 claims description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000006012 monoammonium phosphate Substances 0.000 claims description 2
- 150000002903 organophosphorus compounds Chemical class 0.000 claims description 2
- 235000011007 phosphoric acid Nutrition 0.000 claims description 2
- 229910000073 phosphorus hydride Inorganic materials 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-O pyridinium Chemical class C1=CC=[NH+]C=C1 JUJWROOIHBZHMG-UHFFFAOYSA-O 0.000 claims description 2
- 235000013024 sodium fluoride Nutrition 0.000 claims description 2
- 239000011775 sodium fluoride Substances 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 238000001228 spectrum Methods 0.000 claims description 2
- 230000002269 spontaneous effect Effects 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 239000002585 base Substances 0.000 claims 9
- VDZOOKBUILJEDG-UHFFFAOYSA-M tetrabutylammonium hydroxide Chemical compound [OH-].CCCC[N+](CCCC)(CCCC)CCCC VDZOOKBUILJEDG-UHFFFAOYSA-M 0.000 claims 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 claims 1
- 229910002796 Si–Al Inorganic materials 0.000 claims 1
- 239000003513 alkali Substances 0.000 claims 1
- 150000001768 cations Chemical class 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 238000010792 warming Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 abstract description 4
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000001570 ionothermal synthesis Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 2
- 229940001007 aluminium phosphate Drugs 0.000 description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000010457 zeolite Substances 0.000 description 2
- FHDQNOXQSTVAIC-UHFFFAOYSA-M 1-butyl-3-methylimidazol-3-ium;chloride Chemical compound [Cl-].CCCCN1C=C[N+](C)=C1 FHDQNOXQSTVAIC-UHFFFAOYSA-M 0.000 description 1
- NJMWOUFKYKNWDW-UHFFFAOYSA-N 1-ethyl-3-methylimidazolium Chemical compound CCN1C=C[N+](C)=C1 NJMWOUFKYKNWDW-UHFFFAOYSA-N 0.000 description 1
- BMQZYMYBQZGEEY-UHFFFAOYSA-M 1-ethyl-3-methylimidazolium chloride Chemical compound [Cl-].CCN1C=C[N+](C)=C1 BMQZYMYBQZGEEY-UHFFFAOYSA-M 0.000 description 1
- WVDDUSFOSWWJJH-UHFFFAOYSA-N 1-methyl-3-propylimidazol-1-ium Chemical compound CCCN1C=C[N+](C)=C1 WVDDUSFOSWWJJH-UHFFFAOYSA-N 0.000 description 1
- 238000004410 13C MAS NMR Methods 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- AFCIMSXHQSIHQW-UHFFFAOYSA-N [O].[P] Chemical compound [O].[P] AFCIMSXHQSIHQW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- NWEKXBVHVALDOL-UHFFFAOYSA-N butylazanium;hydroxide Chemical compound [OH-].CCCC[NH3+] NWEKXBVHVALDOL-UHFFFAOYSA-N 0.000 description 1
- 238000002447 crystallographic data Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- HPNMFZURTQLUMO-UHFFFAOYSA-N diethylamine Chemical compound CCNCC HPNMFZURTQLUMO-UHFFFAOYSA-N 0.000 description 1
- WEHWNAOGRSTTBQ-UHFFFAOYSA-N dipropylamine Chemical compound CCCNCCC WEHWNAOGRSTTBQ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JKGITWJSGDFJKO-UHFFFAOYSA-N ethoxy(trihydroxy)silane Chemical class CCO[Si](O)(O)O JKGITWJSGDFJKO-UHFFFAOYSA-N 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229940102396 methyl bromide Drugs 0.000 description 1
- GZUXJHMPEANEGY-UHFFFAOYSA-N methyl bromide Substances BrC GZUXJHMPEANEGY-UHFFFAOYSA-N 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates [SAPO compounds]
-
- 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
-
- 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
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- 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
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- 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
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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
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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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
- 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
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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
- Y02P30/20—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
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- Y02P30/40—Ethylene production
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Abstract
本发明涉及一种LTA型磷酸硅铝分子筛的合成方法及由其制备的催化剂。合成分子筛过程为:将磷源,铝源,硅源,氟源以及季铵碱或氨水加入到离子液体中,在搅拌下使其混合均匀得到初始反应混合物,然后置于反应釜中,在110~280℃下晶化1~180小时;晶化产物经过过滤,洗涤,烘干,得到具有LTA结构的磷酸硅铝分子筛原粉。本发明为离子热法合成,采用季铵碱或氨水作为共模板剂,反应可在常压或较低自生压力下进行,晶化产物具有良好结晶度和酸性特征的LTA型磷酸硅铝分子筛。本发明还涉及该LTA结构的磷酸硅铝分子筛在含氧化合物转化制低碳烯烃反应中的催化应用。
Description
技术领域
本发明涉及一种具有LTA结构的磷酸硅铝分子筛及其制备方法。本发明还涉及上述材料在含氧化合物转化制低碳烯烃反应中的催化应用。
背景技术
分子筛材料由于其规则的孔道结构,可调变的孔道组成以及独特的理化性质,被广泛应用于催化,离子交换,分离,吸附等领域。自从1982年,美国联合碳化物公司(UCC)成功合成出一系列磷铝分子筛及其衍生物以来(US4310440),磷酸铝分子筛及其杂原子取代衍生物一直是材料界和催化领域的研究热点之一。其中,具有LTA拓扑结构的磷酸硅铝分子筛SAPO-42,由于其适宜的孔道结构和酸性质,在甲醇制烯烃(MTO)反应中呈现出较好的催化性能。
SAPO-42(LTA)分子筛,拥有独特的由SOD笼以简单立方形式排列而形成的三维骨架结构,其骨架由PO2 +,AlO2 -和SiO2四面体交替连接组成,孔径为0.41×0.41nm,笼大小1.105×1.105nm,属于小孔分子筛。SAPO-42分子筛可广泛应用于催化,分离等领域。
1984年,美国联合碳化物公司采用水热合成法首次合成SAPO-n系列分子筛(US4440871),这其中包括了磷酸硅铝分子筛SAPO-42。2004年,Morris,R.E.等人发展了一种磷酸铝分子筛的离子热合成方法(Nature430,1012-1016(2004))。与传统的水热方法相比,离子热合成法可以在常压下进行,消除了反应过程中溶剂自生高压带来的安全隐患;并且在合成过程中,离子液体可作为溶剂和模板剂;反应后离子液体可回收利用。2013年,中国海洋石油总公司报道了采用离子热法连续合成SAPO-42分子筛的方法(CN103553074),在合成中所采用的共模板剂均为有机胺,包括二正丙胺,二乙胺,三乙胺和1,6己二胺中的一种或多种,而且专利中并未就SAPO-42分子筛中硅掺杂的程度和分子筛酸性进行说明,也不包含SAPO-42分子筛的催化应用。
发明内容
本发明的目的在于提供一种具有LTA结构的磷酸硅铝分子筛及其在甲醇制低碳烯烃反应中的应用。
为实现上述目的,本发明采用离子热合成,采用季铵碱/氨水作为共模板剂,通过电荷匹配协同效应,有效促进了离子热合成LTA结构分子筛过程中硅原子的掺杂,所合成的LTA磷酸硅铝分子筛具有独特的酸性特征,在甲醇制低碳烯烃反应中表现出非常优异的催化性能。
一种LTA结构的磷酸硅铝分子筛,其特征在于,化学组成为:
mR·nT·uQ·(SixAlyPz)O2
其中,R为离子液体,分布于分子筛笼及孔道中;m为每摩尔(SixAlyPz)O2中离子液体模板剂的摩尔数,m=0.01~2;T为季铵碱/氨水,分布于分子筛笼及孔道中,n为每摩尔(SixAlyPz)O2中T共模板剂的摩尔数,n=0.01~1;Q为F-,u为0.01~1,x,y,z分别表示Si、Al、P的摩尔分数,其范围分别是x=0.001~0.3,y=0.01~0.7,z=0.01~0.6,且x+y+z=1;
其中所述LTA型磷酸硅铝分子筛的X射线衍射图谱在以下位置具有衍射峰:
通过与XRD粉末衍射数据库卡片比较确定其结构为国际沸石协会确认的LTA结构。
本发明报道的一种取制备上述LTA结构磷酸硅铝分子筛的方法,该方法的特点在于制备过程如下:
(a)将磷源,硅源,铝源,氟源和季铵碱/氨水,加入到离子液体中,并混合均匀得到初始反应混合物;
(b)将步骤(a)所得的反应混合物在110℃~280℃下晶化1-180小时;
(c)步骤(b)结束后,将产物冷却至室温,过滤,洗涤和干燥,即得到具有LTA结构的磷酸硅铝分子筛。
上述合成方法步骤(a)所述的反应混合物中SiO2:Al2O3:P2O5:F-:季铵碱/氨水:离子液体的摩尔比为0.01~10:1:0.1~20:0.1~10:0.05~10:2~1000,优选为0.01~2:1:0.5~12:0.5~6:0.4~4:10~200。
上述合成方法中离子液体包含以下阳离子烷基季铵离子[NR4]+,烷基季膦离子[PR4]+,烷基取代的咪唑离子[Rim]+,烷基取代的吡啶离子[Rpy]+中的一种或者两种以上混合的离子液体,R为C1-C16的烷基,其中离子液体的阴离子可为:Cl-,Br-,I-,BF4 -,PF6 -,PO4 3-,NO3 -,SO4 2-,CF3SO3 -,N(CF3SO2)2 -,C(CF3SO2)3-中的一种或两种以上。
上述合成方法中季铵碱为四甲基氢氧化铵,四乙基氢氧化铵,四丙基氢氧化铵,四丁基氢氧化铵等化合物中的一种或两种以上。
上述合成方法中硅源为硅溶胶,硅凝胶,水玻璃,白炭黑,正硅酸乙酯,活性二氧化硅中的一种或两种以上;磷源为磷酸,磷酸铵,磷酸一氢铵,磷酸二氢铵,有机磷化物或磷氧化物中的一种或两种以上;铝源为异丙醇铝,拟薄水铝石,硫酸铝,氢氧化铝,氯化铝,γ氧化铝,高岭土中的一种或两种以上;氟源为氢氟酸,氟化铵,氟化钠中的一种或两种以上。
上述合成方法步骤(a)优选的原料混合温度为70~110℃,步骤(b)优选的晶化温度为140~240℃,优选的晶化时间为1.5~96h,晶化过程的加热方式可采用传统的加热方式,如:烘箱加热,油浴加热,也可以采用微波加热。
上述合成方法中步骤(a)所述的反应混合物中可以含有一定比例的水,水可以由磷酸溶液及氢氟酸溶液等原料带入,也可以额外加入,含水量为反应混合物总重量的0~10wt%。
合成的LTA型磷酸硅铝分子筛经过300~700℃空气中焙烧后,可用作一种含氧化合物转化制低碳烯烃反应的催化剂。
本发明能产生的有益效果在于:
(1)采用离子热法,以季铵碱/氨水为共模板剂,合成获得了具有优异酸性特征的LTA结构的磷酸硅铝分子筛。
(2)通过本发明得到的具有高硅掺杂量的LTA结构磷酸硅铝分子筛具有非常优异的甲醇转化制低碳烯烃反应性能。
(3)本发明采用的制备方法经济性好,操作安全方便。
附图说明
图1为本发明实施例1中样品的XRD谱图。
图2为本发明实施例1中样品的SEM电镜照片。
具体实施方式
下面通过实施例对本发明做进一步的描述,但本发明的实施方式不限于此,不能理解为对本发明保护范围的限制。
实施例中,下列物质采用英文缩写简称:
1-乙基-3-甲基溴化咪唑离子液体简称为EmimBr;1-乙基-3-甲基氯化咪唑离子液体简称为EmimCl;1-丙基-3-甲基溴化咪唑离子液体简称为PmimBr;1-丁基-3-甲基溴化咪唑离子液体简称为BmimBr;1-丁基-3-甲基氯化咪唑离子液体简称为BmimCl;四甲基氢氧化铵简称为TMAOH;四乙基氢氧化铵简称为TEAOH;四丙基氢氧化铵简称为TPAOH;四丁基氢氧化铵简称为TBAOH。
实施例1
将0.4g磷酸(浓度为85wt%)加入到盛装有26.4g1-乙基-3-甲基溴化咪唑离子液体的100ml烧杯中,在保持110℃及搅拌的条件下,加入4.2g四丙基氢氧化铵溶液(浓度为25wt%),0.17g氢氟酸(浓度为40wt%),0.07g正硅酸乙酯(浓度为98wt%),以及0.7g异丙醇铝,继续搅拌30分钟后,得到均匀的初始反应混合物。将上述反应混合物转移到100ml聚四氟乙烯内衬中,再将内衬放入到不锈钢反应釜中,密封好后放入180℃烘箱中晶化10小时。晶化结束后将反应釜取出,并放在水槽中冷却至室温,将产物过滤,用去离子水反复洗涤,于90℃空气中烘干,即得到白色粉末产物。
产物做XRD分析,结果表明该合成产物具有LTA拓扑结构,样品的XRD谱图见附图1。附图2为合成样品的扫描电镜(SEM)照片。
实施例2-15
具体配料比例和晶化条件见表1,具体配料过程同实施例1。
合成样品做XRD分析,数据结果与图1接近,即峰位置和形状相同,依合成条件的变化峰相对峰强度在±10%范围内波动,表明合成产物具有LTA结构的特征。
实施例16
对实施例1-15原粉样品进行13C MAS NMR分析,并对分析结果进行拟合,结合TG分析,将拟合结果与XRF测定得到的无机元素组成归一化,得到分子筛原粉的无水化学组成依次为
0.071Emim+·0.05TPA+·0.5F-·(Si0.07Al0.5P0.44)O2
0.073Emim+·0.052TPA+·0.51F-·(Si0.03Al0.52P0.45)O2
0.075Emim+·0.058TPA+·0.52F-·(Si0.11Al0.49P0.4)O2
0.075Emim+·0.045TBA+·0.5F-·(Si0.15Al0.46P0.39)O2
0.08Emim+·0.069TMA+·0.48F-·(Si0.06Al0.48P0.46)O2
0.084Emim+·0.06TEA+·0.47F-·(Si0.06Al0.53P0.41)O2
0.082Emim+·0.055TPA+·0.49F-·(Si0.05Al0.49P0.46)O2
0.084Emim+·0.054TPA+·0.42F-·(Si0.14Al0.44P0.42)O2
0.072Pmim+·0.05TPA+·0.55F-·(Si0.07Al0.48P0.45)O2
0.08Emim+·0.059TPA+·0.54F-·(Si0.05Al0.52P0.43)O2
0.078Emim+·0.057TPA+·0.48F-·(Si0.06Al0.55P0.35)O2
0.077Emim+·0.055TPA+·0.5F-·(Si0.15Al0.53P0.32)O2
0.066Bmim+·0.07TMA+·0.51F-·(Si0.06Al0.51P0.43)O2
0.082Emim+·0.06TPA+·0.46F-·(Si0.03Al0.55P0.44)O2
0.069Bmim+·0.067TEA+·0.49F-·(Si0.12Al0.49P0.39)O2
实施例17
将实施例1得到的样品于550℃下通入空气焙烧12小时,然后压片,破碎至20~40目。称取150mg样品装入固定床反应器,进行MTO反应评价。在500℃下通氮气活化2小时,然后降温至400℃进行反应。甲醇由氮气携带,氮气流速为7.2ml/min,甲醇重时空速为1h-1。反应产物由在线气相色谱进行分析(GC2014,FID检测器,毛细管柱CP-PoraPLOT Q)。结果示于表1。
表1实施例1的甲醇转化制烯烃反应结果
*最高甲醇转化率99%时最高(乙烯+丙烯+丁烯)选择性
Claims (10)
1.一种LTA结构的磷酸硅铝分子筛,其特征在于,化学组成为:
mR·nT·uQ·(SixAlyPz)O2
其中,R为离子液体,分布于分子筛笼及孔道中;m为每摩尔(SixAlyPz)O2中离子液体模板剂的摩尔数,m=0.01~2;T为季铵碱/氨水,季铵碱/氨水表示季铵碱或氨水;
分布于分子筛笼及孔道中,n为每摩尔(SixAlyPz)O2中T共模板剂的摩尔数,n=0.01~1;Q为F-,u为0.01~1,x,y,z分别表示Si、Al、P的摩尔分数,其范围分别是x=0.001~0.3,y=0.01~0.7,z=0.01~0.6,且x+y+z=1;
其中所述LTA型磷酸硅铝分子筛的X射线衍射图谱在以下位置具有衍射峰:
2.制备如权利要求1所述LTA结构的磷酸硅铝分子筛的方法,其特征在于,包括以下步骤:
(a)将磷源,硅源,铝源,氟源和季铵碱/氨水,加入到离子液体中,并混合均匀得到初始反应混合物,其SiO2:Al2O3:P2O5:F-:季铵碱/氨水:离子液体的摩尔比为0.01~10:1:0.1~20:0.1~10:0.05~10:2~1000;季铵碱/氨水表示季铵碱或氨水;
(b)将步骤(a)所得的反应混合物在110℃~280℃下晶化1-180h;
(c)步骤(b)结束后,将产物冷却至室温,过滤,洗涤和干燥,即得到具有LTA结构的磷酸硅铝分子筛。
3.根据权利要求2所述的方法,其特征在于:离子液体为包含以下阳离子:烷基季铵离子[NR4]+,烷基季膦离子[PR4]+,烷基取代的咪唑离子[Rim]+,烷基取代的吡啶离子[Rpy]+中的一种或者两种以上混合的离子液体,R为C1-C16的烷基。
4.根据权利要求2所述的方法,其特征在于:步骤(a)所述的反应混合物中SiO2:Al2O3:P2O5:F-:季铵碱/氨水:离子液体的摩尔比为0.01~2:1:0.5~12:0.5~6:0.4~4:10~200。
5.根据权利要求2所述的方法,其特征在于:硅源为硅溶胶,硅凝胶,水玻璃,白炭黑,正硅酸乙酯,活性二氧化硅中的一种或两种以上;磷源为磷酸,磷酸铵,磷酸一氢铵,磷酸二氢铵,有机磷化物或磷氧化物中的一种或两种以上;铝源为异丙醇铝,拟薄水铝石,硫酸铝,氢氧化铝,氯化铝,γ氧化铝,高岭土中的一种或两种以上;氟源为氢氟酸,氟化铵,氟化钠中的一种或两种以上。
6.根据权利要求2所述的方法,其特征在于:共模板剂为氨水,季铵碱化合物中的一种或两种以上。季铵碱为四甲基氢氧化铵,四乙基氢氧化铵,四丙基氢氧化铵,四丁基氢氧化铵中的一种或两种以上。
7.根据权利要求2所述的方法,其特征在于:晶化条件为140℃~240℃,常压或自生压力下,晶化时间为1.5~96小时。
8.根据权利要求2所述的方法,其特征在于:步骤(a)中离子液体在原料加入前升温至60~130℃,即原料混合温度为60~130℃。
9.根据权利要求2所述的方法,其特征在于:步骤(a)所述的反应混合物中可以含有一定比例的水,水可以由原料带入,也可以额外加入,含水量为反应混合物总重量的0~10wt%。
10.应用如权利要求1-9任意一项所述方法合成的LTA结构磷酸硅铝分子筛经300~700℃空气中焙烧得到的催化剂。
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