CN117361560A - Mesoporous NaY molecular sieve and preparation method thereof - Google Patents
Mesoporous NaY molecular sieve and preparation method thereof Download PDFInfo
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 59
- 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 59
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 150000007523 nucleic acids Chemical class 0.000 claims abstract description 75
- 102000039446 nucleic acids Human genes 0.000 claims abstract description 70
- 108020004707 nucleic acids Proteins 0.000 claims abstract description 70
- 238000002425 crystallisation Methods 0.000 claims abstract description 67
- 230000008025 crystallization Effects 0.000 claims abstract description 64
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 238000000034 method Methods 0.000 claims abstract description 43
- 239000002243 precursor Substances 0.000 claims abstract description 41
- 239000007788 liquid Substances 0.000 claims abstract description 35
- 238000000137 annealing Methods 0.000 claims abstract description 30
- 239000011148 porous material Substances 0.000 claims abstract description 28
- 239000012452 mother liquor Substances 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 108020004414 DNA Proteins 0.000 claims abstract description 22
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 102000053602 DNA Human genes 0.000 claims abstract description 18
- 108020004682 Single-Stranded DNA Proteins 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010413 mother solution Substances 0.000 claims abstract description 16
- 239000012265 solid product Substances 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000011259 mixed solution Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 23
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 15
- 239000011734 sodium Substances 0.000 claims description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- 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 6
- 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 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 3
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 3
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000243 solution Substances 0.000 description 17
- 238000003786 synthesis reaction Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- 239000008367 deionised water Substances 0.000 description 9
- 229910021641 deionized water Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 235000013339 cereals Nutrition 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 108091028043 Nucleic acid sequence Proteins 0.000 description 5
- 229910021536 Zeolite Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 239000010457 zeolite Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001027 hydrothermal synthesis Methods 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000000967 suction filtration Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000012298 atmosphere Substances 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000003945 anionic surfactant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000010812 external standard method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010335 hydrothermal treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000012229 microporous material Substances 0.000 description 2
- 229920000371 poly(diallyldimethylammonium chloride) polymer Polymers 0.000 description 2
- 239000000376 reactant Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004876 x-ray fluorescence Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- GFLJTEHFZZNCTR-UHFFFAOYSA-N 3-prop-2-enoyloxypropyl prop-2-enoate Chemical compound C=CC(=O)OCCCOC(=O)C=C GFLJTEHFZZNCTR-UHFFFAOYSA-N 0.000 description 1
- SJECZPVISLOESU-UHFFFAOYSA-N 3-trimethoxysilylpropan-1-amine Chemical compound CO[Si](OC)(OC)CCCN SJECZPVISLOESU-UHFFFAOYSA-N 0.000 description 1
- CNODSORTHKVDEM-UHFFFAOYSA-N 4-trimethoxysilylaniline Chemical compound CO[Si](OC)(OC)C1=CC=C(N)C=C1 CNODSORTHKVDEM-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium group Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004523 catalytic cracking Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 239000002149 hierarchical pore Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000010517 secondary reaction Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000010532 solid phase synthesis reaction Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002699 waste material 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
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/20—Faujasite type, e.g. type X or Y
- C01B39/205—Faujasite type, e.g. type X or Y using at least one organic template directing agent; Hexagonal faujasite; Intergrowth products of cubic and hexagonal faujasite
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- 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
-
- 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
- C01P2006/16—Pore diameter
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention relates to a mesoporous NaY molecular sieve and a preparation method thereof, wherein the method comprises the following steps: s1, performing nucleic acid annealing treatment on a single-stranded nucleic acid mother solution to obtain a single-stranded nucleic acid annealing mother solution; wherein, the sequence length of the single-stranded DNA chain segment in the single-stranded nucleic acid mother solution is 15-200bp; s2, mixing a silicon source, the single-stranded nucleic acid annealing mother liquor, water, an alkali source, an aluminum source and a NaY guiding agent to obtain a crystallization precursor liquid; and S3, crystallizing the crystallization precursor liquid, taking out a solid product and roasting. The method has simple steps and low cost, and can prepare the mesoporous NaY molecular sieve with high mesoporous volume content and narrow mesoporous pore diameter distribution.
Description
Technical Field
The application relates to a mesoporous NaY molecular sieve and a preparation method thereof.
Background
As an important active component of the industrial catalyst, the Y-type molecular sieve is widely applied to catalytic cracking and other devices. The Y-type molecular sieve belongs to FAU structure, has pore diameter of 0.74nm and is a microporous material. Under the background that the refining industrial processing raw materials are increasingly heavy and inferior, the pure microporous materials are limited in structural openness, a part of macromolecular reactants are limited in size and are difficult to contact and react with acid centers in micropores of the molecular sieve, so that the utilization efficiency of active centers of the catalytic materials is reduced, in addition, surface coking is aggravated, and the performance and the service life of the catalyst are influenced. Through a specific means, mesopores are introduced into the microporous molecular sieve material to form a multistage porous molecular sieve, so that the diffusion performance of reactants/products can be effectively optimized, adverse secondary reactions are reduced, and the overall catalytic performance is improved. The Y-type molecular sieve can be directly prepared by hydrothermal synthesis from a sol/gel raw material containing a silicon source and an aluminum source through a chemical synthesis method. Research shows that the mesoporous molecular sieve containing mesopores can be obtained by introducing specific materials as mesoporous template agents in the synthesis process. However, the mesoporous and microporous connectivity of the molecular sieve obtained by introducing the mesoporous template agent in the synthesis process is usually insufficient, so that the adsorption or catalytic effect is not improved obviously.
Patent CN100439246C discloses a method for synthesizing composite pore zeolite molecular sieve by using hard template or composite template. The key of the technology is that the common silicon source and the metal atoms of the doped framework are used as raw materials, and the composite pore zeolite molecular sieve with micropores and mesopores is prepared by hydrothermal treatment and calcination and is used as an adsorbent, a catalyst and a catalyst carrier. However, the invention uses rice husk or alkaline styrene ion exchange resin or inorganic carbon and the like as hard template materials, and mesopores introduced in synthetic crystals of the hard template materials are relatively independent, so that the connectivity among mesopores of a crystal product is limited, and the active center of the molecular sieve can not be fully utilized.
Patent CN103539151 discloses a preparation method of a high silica-alumina ratio Y-type zeolite with abundant secondary pores, the key of the technology is that firstly, fe-NaY zeolite with high crystallinity and high silica-alumina ratio is synthesized, then ammonium exchange and hydrothermal treatment are alternately used, and a Y-type molecular sieve (USFeY zeolite) with high silica-alumina ratio and abundant secondary pores is obtained. However, the method relies on a molecular sieve matrix containing hetero atoms, and has limited universality; and the method requires multiple steps of post-treatment, and has complex steps, higher energy consumption and large treatment volume of three wastes.
Patent CN107555446 discloses a preparation method of a hierarchical pore Y-type molecular sieve. The key point of the technology is that an anionic surfactant is used as a mesostructure guiding agent, sol containing seed crystal glue, a silicon source and an aluminum source, a co-structure guiding agent and a template agent are mixed, and the multi-level pore Y molecular sieve is obtained through hydrothermal synthesis, filtration, washing, drying and roasting. However, because the interaction between the anionic surfactant serving as a template agent and inorganic silicon species is weak, a stable mesoscopic phase structure is difficult to form, the method needs to use organosilane such as aminopropyl trimethoxy silane, p-aminophenyl trimethoxy silane and the like as a co-structure directing agent, and meanwhile, the content of mesopores formed in a crystallized product is limited (the volume of mesopores accounts for about 20 percent of the total pore volume).
Disclosure of Invention
The invention aims to provide a mesoporous NaY molecular sieve and a preparation method thereof, and the method has simple steps and low cost, and can prepare the mesoporous NaY molecular sieve with mesoporous content Gao Jujie and narrow pore diameter distribution range.
In order to achieve the above object, a first aspect of the present invention provides a method for preparing a mesoporous NaY molecular sieve, the method comprising:
s1, performing nucleic acid annealing treatment on a single-stranded nucleic acid mother solution to obtain a single-stranded nucleic acid annealing mother solution; wherein, the sequence length of the single-stranded DNA chain segment in the single-stranded nucleic acid mother solution is 15-200bp;
s2, mixing a silicon source, the single-stranded nucleic acid annealing mother liquor, water, an alkali source, an aluminum source and a NaY guiding agent to obtain a crystallization precursor liquid;
and S3, crystallizing the crystallization precursor liquid, taking out a solid product and roasting.
Alternatively, the sequence length of the single-stranded DNA segment is 20-200bp, preferably 30-180bp, and the content of the single-stranded DNA segment in the single-stranded nucleic acid mother solution is 50-200. Mu. Mol/L.
Optionally, the content of the single-stranded DNA segment in the crystallization precursor solution is 5-50nmol/g.
Optionally, in step S1, the conditions of the nucleic acid annealing treatment include: the temperature is 88-98deg.C, and the time is 2-6min.
Optionally, step S2 includes:
SS1, mixing the silicon source, the single-stranded nucleic acid annealing mother liquor and water to obtain a first mixed solution;
SS2, mixing the alkali source, the aluminum source and water to obtain a second mixed solution;
and SS3, mixing the first mixed solution, the second mixed solution and the NaY guiding agent to obtain the crystallization precursor liquid.
Optionally, in step S2, the crystallization precursor liquid has (4-5) Na 2 O·Al 2 O 3 ·(5-12)SiO 2 ·(160-250)H 2 Schematic molar composition of O;
the content of the NaY guiding agent in the crystallization precursor liquid is 8-20 wt%.
Optionally, the NaY directing agent has (15-20) Na 2 O·Al 2 O 3 ·(10-18)SiO 2 ·(250-380)H 2 Schematic molar composition of O.
Optionally, in step S3, the crystallization conditions include: the temperature is 88-110 ℃ and the time is 12-48 hours.
Optionally, step S3 further includes: taking out the solid product, washing and drying the solid product, and roasting the solid product;
the roasting conditions include: the temperature is 500-600 ℃ and the time is 4-6 hours.
Optionally, the silicon source is selected from one or more of water glass, silica sol, ethyl orthosilicate and methyl orthosilicate; the alkali source is selected from sodium hydroxide and/or potassium hydroxide; the aluminum source is selected from one or more of sodium aluminate, aluminum sulfate, aluminum nitrate and aluminum sol.
The second aspect of the invention provides a mesoporous NaY screen prepared by the method provided by the first aspect of the invention.
Optionally, the average grain size of the mesoporous NaY sieve is 400-600nm, the mesoporous volume accounts for 30-35% of the total pore volume, the silicon-aluminum molar ratio is 1.5-3, and the relative crystallinity is 75-90%.
Through the technical scheme, the invention has the following beneficial effects:
(1) The invention uses single-chain nucleic acid as flexible template agent, and the material has mature commercial solid phase synthesis technology, and is easy to obtain; meanwhile, the nucleic acid sequence composition can be flexibly designed, the segment length is nano-scale and the mesoporous scale rationality is adjustable, thereby being beneficial to regulating and controlling a communication pore system in a crystallized product, being suitable for introducing communication mesopores into a molecular sieve material and leading the mesoporous pore size distribution of the prepared molecular sieve to be narrower.
(2) The single-stranded nucleic acid used in the method is in a flexible one-dimensional linear structure, the nucleic acid charge density is low, and the compatibility with inorganic components in a synthesis system is good; in addition, other co-structure guiding agents or mesoporous template agents are not relied on in the synthesis process, so that the synthesis cost is further reduced.
(3) The mesoporous NaY molecular sieve prepared by the method has high mesoporous volume content.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
FIG. 1 is an XRD diffraction pattern of the mesoporous NaY molecular sieve prepared in example 1 of the present invention.
FIG. 2 is a scanning electron microscope image of the mesoporous NaY molecular sieve prepared in example 1 of the present invention.
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The first aspect of the present invention provides a method for preparing a mesoporous NaY molecular sieve, the method comprising: s1, performing nucleic acid annealing treatment on a single-stranded nucleic acid mother solution to obtain a single-stranded nucleic acid annealing mother solution; wherein, the sequence length of the single-stranded DNA chain segment in the single-stranded nucleic acid mother solution is 15-200bp; s2, mixing a silicon source, the single-stranded nucleic acid annealing mother liquor, water, an alkali source, an aluminum source and a NaY guiding agent to obtain a crystallization precursor liquid; and S3, crystallizing the crystallization precursor liquid, taking out a solid product and roasting.
The invention adopts single-stranded nucleic acid as a flexible mesoporous template agent, utilizes good compatibility of the single-stranded nucleic acid and an inorganic synthesis system, does not depend on other co-structure directing agents and multi-step post-treatment, realizes the synthesis of the mesoporous NaY molecular sieve by a one-step hydrothermal method, has simple preparation method and low cost, and can prepare the mesoporous NaY molecular sieve with narrow mesoporous pore size distribution and high mesoporous content.
In one embodiment of the present invention, the single-stranded nucleic acid mother liquor is subjected to a nucleic acid annealing treatment and then cooled to 20-25 ℃. The complex secondary structure in the nucleic acid mother solution can be converted into a linear structure after the annealing treatment of the single-stranded nucleic acid mother solution, the nucleic acid charge density is low, the compatibility with inorganic components in a synthesis system is good, the nucleic acid length is nano-scale, and the method is suitable for introducing communication mesopores into a microporous molecular sieve material.
In one embodiment of the present invention, the sequence length of the single-stranded DNA segment is 20 to 200bp, preferably 30 to 180bp, and the content of the single-stranded DNA segment in the single-stranded nucleic acid mother solution is 50 to 200. Mu. Mol/L, preferably 80 to 180. Mu. Mol/L. The single-stranded nucleic acid in the method of the invention can be obtained commercially, and the mesoporous NaY molecular sieve with narrower mesoporous pore size distribution can be prepared in the method of the invention.
In one embodiment of the present invention, the content of the single-stranded DNA segment in the crystallization precursor solution is 5 to 50nmol/g, preferably 10 to 45nmol/g.
According to the present invention, the nucleic acid annealing treatment refers to a treatment process in which a complex secondary structure of a nucleic acid is thermally dissociated into a linear structure under a certain temperature condition. The temperature of the annealing treatment of the nucleic acid may be specifically selected according to the melting temperature of the nucleic acid, so long as the annealing temperature is higher than the melting temperature of the nucleic acid. In one embodiment of the present invention, in step S1, the conditions for the annealing treatment of the nucleic acid include: the temperature is 88-98deg.C, and the time is 2-6min; preferably, the temperature is 90-95℃for 3-5min.
According to the present invention, the conditions of mixing in step S2 are not particularly limited, and for example, mixing may be performed at 20 to 25 ℃. In one embodiment of the present invention, step S2 includes: SS1, mixing the silicon source, the single-stranded nucleic acid annealing mother liquor and water to obtain a first mixed solution; SS2, mixing the alkali source, the aluminum source and water to obtain a second mixed solution; and SS3, mixing the first mixed solution, the second mixed solution and the NaY guiding agent to obtain the crystallization precursor liquid. In the embodiment, different raw materials are respectively prepared into different mixed solutions and then mixed, so that the mesoporous NaY molecular sieve with narrower mesoporous pore size distribution and higher mesoporous volume content can be prepared.
In one embodiment of the present invention, in step S2, the crystallization precursor solution has (4-5) Na 2 O·Al 2 O 3 ·(5-12)SiO 2 ·(160-250)H 2 Schematic molar composition of O.
According to the present invention, the content of the NaY directing agent in the crystallization precursor liquid may be discriminated in a wide range, and in one embodiment, the content of the NaY directing agent in the crystallization precursor liquid is 8 to 20 wt%, preferably 10 to 16 wt%.
NaY directing agents are well known to those skilled in the art in accordance with the present invention, and in one embodiment of the present invention, the NaY directing agent has (15-20) Na 2 O·Al 2 O 3 ·(10-18)SiO 2 ·(250-380)H 2 Schematic molar composition of O. The preparation method of the guiding agent is well known to those skilled in the art, and the raw materials used for preparing the NaY guiding agent can be deionized water, sodium metaaluminate, sodium hydroxide, sodium silicate, water glass and the like. In one embodiment, the molar ratio of the raw materials in the preparation of the guiding agent is (15-20) Na 2 O：Al 2 O 3 ：(10-18)SiO 2 ：(250-380)H 2 O, wherein Na in the raw material for preparing NaY directing agent is Na 2 O is calculated, al is calculated as Al 2 O 3 Si is calculated as SiO 2 And (5) counting.
According to the present invention, the crystallization treatment is a static crystallization treatment, and the crystallization treatment may be performed in a heat-resistant sealed container, for example, in a crystallization kettle. The conditions of the crystallization treatment may include: the temperature is 88-110 ℃ and the time is 12-48 hours; preferably, the temperature is 95-105℃and the time is 16-36 hours. The crystallization pressure may be a pressure generated by the reaction itself or an applied pressure, and is preferably a pressure generated by the reaction itself. The method of the invention uses single-stranded nucleic acid as a flexible template agent, realizes no dependence on other co-structure directing agents, avoids multi-step post-treatment, and can realize the synthesis of the mesoporous NaY molecular sieve by a one-step hydrothermal method, and the method is simple and easy to implement.
According to the present invention, the method for taking out the solid product is not particularly limited, and for example, centrifugal separation, filtration, suction filtration and the like can be employed.
In a specific embodiment of the present invention, step S3 further includes: the solid product is taken out, washed and dried, and then the roasting is carried out to remove single-stranded nucleic acid materials. Calcination is well known to those skilled in the art and may be carried out, for example, in a muffle furnace or a tube furnace. The roasting conditions include: the temperature is 500-600 ℃ and the time is 4-6 hours, and the roasting atmosphere is not particularly limited in the invention, and can be, for example, air atmosphere or inert gas atmosphere. The washing may be with any liquid that does not react with the solid product, and in one embodiment, the solid product is washed with ethanol and deionized water sequentially, 5-10 times for each solvent. Drying may be performed in a constant temperature oven, and the drying conditions may include: the temperature is 100-150 ℃ and the time is 2-4 hours.
According to the present invention, the silicon source may be selected from one or more of water glass, silica sol, ethyl orthosilicate and methyl orthosilicate; the alkali source is selected from sodium hydroxide and/or potassium hydroxide; the aluminum source is selected from one or more of sodium aluminate, aluminum sulfate, aluminum nitrate and aluminum sol.
The second aspect of the invention provides a mesoporous NaY screen prepared by the method provided by the first aspect of the invention.
In a specific embodiment of the invention, the average grain size of the mesoporous NaY sieve is 400-600nm, the mesoporous volume accounts for 30-35% of the total pore volume, the silicon-aluminum molar ratio is 1.5-3, wherein the silicon-aluminum molar ratio refers to the molar ratio of Si element to Al element, and the relative crystallinity is 75-90%.
The invention is further illustrated by the following examples, which are not intended to be limiting in any way.
In the examples below, the room temperature is 25 ℃. The raw materials used in the examples and comparative examples were all commercially available unless otherwise specified. The water glass is provided by Qilu division of China petrochemical catalyst, wherein the content of sodium oxide is 77.6g/L, the content of silicon dioxide is 249.6g/L, and the modulus is 3.32.
The relative crystallinity, average grain size, silicon-aluminum molar ratio, micropore volume and mesopore volume of the molecular sieve in the application are measured as follows:
the relative crystallinity of the molecular sieves referred to ASTM D3906-91 and SH/T0340-92 standard methods were normalized to commercial Y molecular sieves (Tianjin southbound catalyst Co., ltd., na-type Y molecular sieves), which was defined as 100%. And multiplying the sum of peak heights of 8 diffraction characteristic peaks with 2 theta angles of 14-35 degrees in an XRD spectrum of the crystallized product by the half-width of a (533) diffraction peak with the 2 theta angles of 23.5 degrees to obtain the diffraction intensity of the molecular sieve, and calculating the crystallinity of the molecular sieve to be detected by an external standard method. Test instrument: type D5005X-ray diffractometer from siemens, germany. Test conditions: cu target, K alpha radiation, solid detector, tube voltage 40kV, tube current 40mA, step scanning, step length 0.02 DEG, prefabrication time 2s, scanning range 5 DEG-70 deg.
The molar ratio of silicon to aluminum of the molecular sieve is quantitatively characterized by adopting an X-ray fluorescence method. Test instrument: 3271E-type X-ray fluorescence spectrometer of Nippon Denshoku Kogyo Co. Test conditions: the powder sample is pressed into tablets, the rhodium target is pressed into tablets, the excitation voltage is 50kV, the excitation current is 50mA, the spectral line intensity of each element is detected by a scintillation counter and a proportional counter, and the element content is quantitatively and semi-quantitatively analyzed by an external standard method.
In examples and comparative examples, the grain size of the molecular sieve was measured by Scanning Electron Microscopy (SEM), and 20 grain sizes (maximum observable size) were randomly measured, and the average was taken to obtain the average grain size of the molecular sieve sample.
The pore volume (total pore volume, mesoporous pore volume) and pore size distribution of the molecular sieve are measured by adopting a low-temperature nitrogen adsorption capacity method. Test instrument: micromeritics company ASAP2400 static nitrogen adsorber. Test conditions: the sample is vacuumized and degassed for 4 hours under the conditions of 1.33Pa and 300 ℃, then is contacted with liquid nitrogen under the condition of 77K, isothermal adsorption and desorption are carried out, adsorption and desorption isotherms are measured, the pore volume is calculated by using a BET formula, and the pore size distribution is calculated by using a BJH formula.
Example 1
(1) Preparation of NaY directing agent: 4g of sodium hydroxide solid, 1g of sodium metaaluminate solid and 10.0g of deionized water are thoroughly mixed, stirred at room temperature for 15 minutes, 25g of water glass is added thereto to obtain a mixed solution, the mixed solution is stirred at room temperature for 1 hour, and then placed in a water bath at 33 ℃ for standing for 26 hours to obtain a NaY guide agent which has 17.8Na 2 O：Al 2 O 3 ：17.0SiO 2 ：357.9H 2 Molar composition of O.
(2) Preparing single-stranded nucleic acid mother liquor: and heating the single-stranded nucleic acid mother liquor (with the concentration of 100 mu mol/L) to 95 ℃ for annealing and keeping for 3 minutes, and cooling to room temperature to finish the annealing treatment of the nucleic acid to obtain the single-stranded nucleic acid mother liquor. The nucleic acid sequence in this example is (length 40bp according to 5 'end to 3' end): GACGG CTCAA ACTTT ACTCA TCTCA ACGCA AATTC AACTC (SEQ ID NO. 1).
(3) Preparing crystallization precursor liquid: and (3) fully dissolving water glass in the ionized water, uniformly mixing to obtain a silicon source solution, adding the single-stranded nucleic acid obtained in the previous step into the silicon source solution, and uniformly mixing at room temperature to obtain a first mixed solution. And fully dissolving sodium hydroxide in deionized water, adding aluminum sulfate, and stirring for 2 hours at room temperature to obtain a second mixed solution. Mixing the first mixed solution and the second mixed solution to obtain crystallization mother liquor, adding 1g of the guiding agent obtained in the step (1) into 9g of the crystallization mother liquor, stirring for 1h at room temperature to obtain 10g of crystallization precursor liquid, wherein the content of single-stranded DNA chain segments in the crystallization precursor liquid is 10nmol/g, and the crystallization precursor liquid has 4.8Na 2 O·Al 2 O 3 ·6.5SiO 2 ·216H 2 Schematic molar composition of O.
(4) Crystallization: and (3) filling the crystallization precursor liquid into a crystallization kettle, and crystallizing for 24 hours at 95 ℃ by adopting a static crystallization method.
(5) Post-treatment: after crystallization, the crystallized mixture is subjected to solid-liquid separation, and suction filtration, washing and drying are sequentially carried out. Roasting the dried crystallized product for 4 hours at 550 ℃, removing residual single-stranded nucleic acid to obtain the mesoporous NaY molecular sieve, wherein the XRD diffraction pattern of the mesoporous NaY molecular sieve is shown in figure 1, and the scanning electron microscope pattern is shown in figure 2.
Example 2
(1) Preparation of NaY directing agent: 4.2g of sodium hydroxide solid, 1g of sodium metaaluminate solid and 7.6g of deionized water are fully mixed, stirred at room temperature for 15 minutes, 20.5g of water glass is added to the mixture, the obtained mixture is stirred at room temperature for 1 hour, and then the mixture is placed in a water bath at 35 ℃ for standing for 24 hours, so as to obtain a NaY directing agent which has 16.5Na 2 O·Al 2 O 3 ·13.9SiO 2 ·287.7H 2 Molar composition of O.
(2) Preparing single-stranded nucleic acid mother liquor: and heating the single-stranded nucleic acid mother liquor (with the concentration of 100 mu mol/L) to 95 ℃ for annealing and keeping for 3 minutes, and cooling to room temperature to finish the annealing treatment of the nucleic acid to obtain the single-stranded nucleic acid mother liquor. The nucleic acid sequence in this example is (according to the 5 '-end to 3' -end direction, sequence length 80 bp): CTCTG TACCT ATCAT CCCAC TTACC GTTCA TCAGC ACTAG CTCTG TACCT ATCAT CCCAC TTACC GTTCA TCAGC ACTAG (SEQ ID NO. 2).
(3) Preparing crystallization precursor liquid: fully dissolving water glass in ionized water, and uniformly mixing to obtain a silicon source solution; and adding the single-stranded nucleic acid obtained in the previous step into a silicon source solution, and uniformly mixing at room temperature to obtain a first mixed solution. And fully dissolving sodium hydroxide in deionized water, adding aluminum sulfate, and stirring for 2 hours at room temperature to obtain a second mixed solution. And mixing the first mixed solution and the second mixed solution to obtain crystallization mother liquor. Adding 0.8g of the directing agent obtained in the step (1) into 9.2g of crystallization mother liquor, stirring for 2 hours at room temperature to obtain 10g of crystallization precursor solution, wherein the content of single-stranded DNA chain segments in the crystallization precursor solution is 50nmol/g, and the crystallization precursor solution has 4.5Na 2 O：Al 2 O 3 ：10SiO 2 ：185H 2 Schematic molar composition of O.
(4) Crystallization: and (3) filling the crystallization precursor liquid into a crystallization kettle, and crystallizing for 20 hours at 100 ℃ by adopting a static crystallization method.
(5) Post-treatment: after crystallization, the crystallized mixture is subjected to solid-liquid separation, and suction filtration, washing and drying are sequentially carried out. Roasting the dried crystallized product at 520 ℃ for 5 hours, and removing the residual single-stranded nucleic acid to obtain the mesoporous NaY molecular sieve.
Example 3
(1) Preparation of NaY directing agent: 3.9g of sodium hydroxide solid, 1.05g of sodium metaaluminate solid and 11.5g of deionized water are fully mixed, stirred at room temperature for 15 minutes, 25.5g of water glass is added to the mixture, the obtained mixture is stirred at room temperature for 2 hours, and then the mixture is placed in a water bath at 37 ℃ for standing for 20 hours, so as to obtain a NaY directing agent which has 16.9Na 2 O·Al 2 O 3 ·16.5SiO 2 ·362.2H 2 Schematic molar composition of O.
(2) Preparing single-stranded nucleic acid mother liquor: the single-stranded nucleic acid mother liquor (concentration 200 mu mol/L) is heated to 90 ℃ for annealing and kept for 4 minutes, and then cooled to room temperature, thus the nucleic acid annealing treatment is completed, and the single-stranded nucleic acid mother liquor is obtained. The nucleic acid sequence in this example is (length 160bp according to 5 'end to 3' end): GTTAT CATCA CGTCT AATCC CTGGC AAATA CAATA CTATA GTTAT CATCA CGTCT AATCC CTGGC AAATA CAATA CTATA GTTAT CATCA CGTCT AATCC CTGGC AAATA CAATA CTATA GTTAT CATCA CGTCT AATCC CTGGC AAATA CAATA CTATA (SEQ ID NO. 3).
(3) Preparing crystallization precursor liquid: fully dissolving silica sol in ionized water, and uniformly mixing to obtain a silicon source solution; and adding the single-stranded nucleic acid obtained in the previous step into a silicon source solution, and uniformly mixing at room temperature to obtain a first mixed solution. And fully dissolving sodium hydroxide in deionized water, adding aluminum nitrate, and stirring for 2 hours at room temperature to obtain a second mixed solution. And mixing the first mixed solution and the second mixed solution to obtain crystallization mother liquor. Adding 1.3g of the directing agent obtained in the step (1) into 8.7g of crystallization mother liquor, stirring for 2 hours at room temperature to obtain 10g of crystallization precursor solution, wherein the content of single-stranded DNA chain segments in the crystallization precursor solution is 20nmol/g, and the crystallization precursor solution has 4.3Na 2 O·Al 2 O 3 ·9SiO 2 ·200H 2 Schematic molar composition of O.
(4) Crystallization: and (3) filling the crystallization precursor liquid into a crystallization kettle, and crystallizing for 40 hours at 90 ℃ by adopting a static crystallization method.
(5) Post-treatment: after crystallization, the crystallized mixture is subjected to solid-liquid separation, and suction filtration, washing and drying are sequentially carried out. Roasting the dried crystallized product at 500 ℃ for 6 hours, and removing the residual single-stranded nucleic acid to obtain the mesoporous NaY molecular sieve.
Example 4
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that in step (3), the content of single-stranded DNA segments in the crystallization precursor solution was 1nmol/g.
Example 5
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that in step (2), the nucleic acid sequence was (15 bp in length according to the 5 'to 3' orientation): GACGG CTCAA ACTTT (SEQ ID NO. 4).
Example 6
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that in step (2), the temperature of the nucleic acid annealing treatment was 50 ℃ for 1min.
Example 7
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that in step (3), water glass, single-stranded nucleic acid mother liquor, deionized water, sodium hydroxide, aluminum sulfate, and the NaY directing agent prepared in step (1) of example 1 were mixed instead of stepwise mixing.
The content of the directing agent in the obtained crystallization precursor liquid is 10 weight percent, the content of the single-stranded DNA chain segment is 10nmol/g, and the crystallization precursor liquid has 4.8Na 2 O·Al 2 O 3 ·6.5SiO 2 ·216H 2 Schematic molar composition of O.
Comparative example 1
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that step (2) was not present and that the crystallization precursor solution was prepared without adding a single-stranded nucleic acid mother liquor.
Comparative example 2
Mesoporous NaY molecular sieves were prepared in the same manner as in example 1, except that step (2) was omitted and that the crystallization precursor liquid was prepared by replacing the single-stranded nucleic acid mother liquor with the chain oligomer polydiallyl dimethyl ammonium chloride (PDDA, mw 100,000-200,000, innochem, a 71079).
The results of testing the relative crystallinity, average crystal grain size and pore structure characteristics of the molecular sieves obtained in each example and comparative example are shown in table 1.
TABLE 1
As can be seen from Table 1, the mesoporous NaY molecular sieve obtained by the method of the invention has mesoporous volume which accounts for more than 21% of the total pore volume, has higher mesoporous volume content, narrower mesoporous pore size distribution and small grain size; and compared with the comparative sample, the mesoporous volume is less than 10% of the total pore volume, and the mesoporous pore size distribution is wider.
Sequence listing
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Research Institute of petrochemicals, Sinopec
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Claims (12)
1. A method of preparing a mesoporous NaY molecular sieve, the method comprising:
s1, performing nucleic acid annealing treatment on a single-stranded nucleic acid mother solution to obtain a single-stranded nucleic acid annealing mother solution; wherein, the sequence length of the single-stranded DNA chain segment in the single-stranded nucleic acid mother solution is 15-200bp;
s2, mixing a silicon source, the single-stranded nucleic acid annealing mother liquor, water, an alkali source, an aluminum source and a NaY guiding agent to obtain a crystallization precursor liquid;
and S3, crystallizing the crystallization precursor liquid, taking out a solid product and roasting.
2. The method according to claim 1, wherein the sequence length of the single-stranded DNA segment is 20-200bp, preferably 30-180bp, and the content of the single-stranded DNA segment in the single-stranded nucleic acid mother liquor is 50-200. Mu. Mol/L.
3. The method according to claim 1, wherein the content of the single-stranded DNA segment in the crystallization precursor liquid is 5-50nmol/g.
4. The method according to claim 1, wherein in step S1, the conditions of the nucleic acid annealing treatment include: the temperature is 88-98deg.C, and the time is 2-6min.
5. The method according to claim 1, wherein step S2 comprises:
SS1, mixing the silicon source, the single-stranded nucleic acid annealing mother liquor and water to obtain a first mixed solution;
SS2, mixing the alkali source, the aluminum source and water to obtain a second mixed solution;
and SS3, mixing the first mixed solution, the second mixed solution and the NaY guiding agent to obtain the crystallization precursor liquid.
6. The method according to claim 1, wherein in step S2, the crystallization precursor liquid has (4-5) Na 2 O·Al 2 O 3 ·(5-12)SiO 2 ·(160-250)H 2 Schematic molar composition of O;
the content of the NaY guiding agent in the crystallization precursor liquid is 8-20 wt%.
7. The method of claim 1, wherein the NaY directing agent has (15-20) Na 2 O·Al 2 O 3 ·(10-18)SiO 2 ·(250-380)H 2 Schematic molar composition of O.
8. The method according to claim 1, wherein in step S3, the conditions of the crystallization process include: the temperature is 88-110 ℃ and the time is 12-48 hours.
9. The method of claim 1, wherein step S3 further comprises: taking out the solid product, washing and drying the solid product, and roasting the solid product;
the roasting conditions include: the temperature is 500-600 ℃ and the time is 4-6 hours.
10. The method of claim 1, wherein the silicon source is selected from one or more of water glass, silica sol, ethyl orthosilicate, and methyl orthosilicate; the alkali source is selected from sodium hydroxide and/or potassium hydroxide; the aluminum source is selected from one or more of sodium aluminate, aluminum sulfate, aluminum nitrate and aluminum sol.
11. A mesoporous NaY sieve prepared by the method of any one of claims 1-10.
12. The mesoporous NaY sieve according to claim 11, wherein the average grain size of the mesoporous NaY sieve is 400-600nm, the mesoporous volume is 30-35% of the total pore volume, the molar ratio of silicon to aluminum is 1.5-3, and the relative crystallinity is 75-90%.
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