CN113998707A - Super-macroporous IRR structure silicate molecular sieve material and preparation method thereof - Google Patents
Super-macroporous IRR structure silicate molecular sieve material and preparation method thereof Download PDFInfo
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- 239000002808 molecular sieve Substances 0.000 title claims abstract description 67
- 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 67
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 title claims description 17
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 25
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 5
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 5
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 5
- 150000001767 cationic compounds Chemical class 0.000 claims abstract description 4
- 229910001411 inorganic cation Inorganic materials 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims abstract 2
- 239000010703 silicon Substances 0.000 claims description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 22
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 13
- 150000001875 compounds Chemical class 0.000 claims description 11
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical group F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 10
- -1 N-substituted imidazole Chemical class 0.000 claims description 9
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 239000011737 fluorine Substances 0.000 claims description 5
- 229910052731 fluorine Inorganic materials 0.000 claims 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 claims description 4
- 239000012298 atmosphere Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 4
- 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 3
- 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 3
- 229910052795 boron group element Inorganic materials 0.000 claims description 3
- 150000002892 organic cations Chemical class 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 2
- TYYRFZAVEXQXSN-UHFFFAOYSA-H aluminium sulfate hexadecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O TYYRFZAVEXQXSN-UHFFFAOYSA-H 0.000 claims description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 2
- 239000004327 boric acid Substances 0.000 claims description 2
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical group [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 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
- UQMOLLPKNHFRAC-UHFFFAOYSA-N tetrabutyl silicate Chemical compound CCCCO[Si](OCCCC)(OCCCC)OCCCC UQMOLLPKNHFRAC-UHFFFAOYSA-N 0.000 claims description 2
- 150000001640 boron group elements Chemical class 0.000 claims 1
- 239000006229 carbon black Substances 0.000 claims 1
- 229910052727 yttrium Inorganic materials 0.000 claims 1
- 238000006555 catalytic reaction Methods 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 3
- 239000000047 product Substances 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 238000003786 synthesis reaction Methods 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- 238000000634 powder X-ray diffraction Methods 0.000 description 7
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 229940119177 germanium dioxide Drugs 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 229910021536 Zeolite Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 125000005842 heteroatom Chemical group 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 239000010457 zeolite Substances 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
- MCTWTZJPVLRJOU-UHFFFAOYSA-N 1-methyl-1H-imidazole Chemical compound CN1C=CN=C1 MCTWTZJPVLRJOU-UHFFFAOYSA-N 0.000 description 1
- WAXIFMGAKWIFDQ-UHFFFAOYSA-N 1-tert-butyl-4-(chloromethyl)benzene Chemical compound CC(C)(C)C1=CC=C(CCl)C=C1 WAXIFMGAKWIFDQ-UHFFFAOYSA-N 0.000 description 1
- UEMWTWAFDOVTMZ-UHFFFAOYSA-O C(C1=CC=CC=C1)N1C(=[NH+]C=C1)C(C)(C)C Chemical group C(C1=CC=CC=C1)N1C(=[NH+]C=C1)C(C)(C)C UEMWTWAFDOVTMZ-UHFFFAOYSA-O 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000007171 acid catalysis Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003957 anion exchange resin Substances 0.000 description 1
- 150000001639 boron compounds Chemical class 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000002330 electrospray ionisation mass spectrometry Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
- 238000004467 single crystal X-ray diffraction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
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- 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
- C01B39/04—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 using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
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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
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/047—Germanosilicates; Aluminogermanosilicates
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- 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
- C01B39/06—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis
- C01B39/08—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis the aluminium atoms being wholly replaced
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- 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
- C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
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Abstract
The invention discloses a super-macroporous silicate molecular sieve with an IRR (iron-reducing) framework crystal structure, which has a chemical composition form of p (M)1/nXO2)·qYO2·SiO2Wherein M represents a proton or an inorganic cation of + n valency; x represents one or more trivalent elements; y represents one or more tetravalent elements other than Si and Ge; p is 0-0.03 and q is 0-0.03. The molecular sieve has oversized 18-membered pore channels in the c-axis direction of a unit cell, 12-membered pore channels in the a-axis and b-axis directions, and 18 multiplied by 12 crossed three-dimensional pore channels. The invention further discloses a preparation method of the molecular sieve, which is obtained by a hydrothermal synthesis method and using an organic template agent and a certain amount of seed crystals to promote crystallization,after the organic template agent is removed, the framework structure is stable, and the catalyst has potential application value in the field of catalysis.
Description
Technical Field
The invention belongs to the technical field of zeolite molecular sieve preparation, and particularly relates to a preparation method of a super-macroporous IRR structure silicate molecular sieve material.
Background
Molecular sieves are of the type consisting of TO4The (T ═ Si, Al, Ge and the like) tetrahedrons are made of porous materials by sharing vertices, and have excellent chemical and hydrothermal stability, variable chemical compositions, specific pore diameters and pore shapes, thereby showing performances such as solid acidity, gas selective adsorption and separation, ion exchange, guest molecule transportation and the like. Has an empirical chemical formula: x (M)1/ nXO2)·yYO2·zR·qH2O, wherein M represents one or more organic or inorganic cations having a valence of + n; x represents one or more trivalent elements; y represents one or more tetravalent elements, usually Si; r represents one or more organic molecules.
According TO TO of the enclosed tunnel4The tetrahedral number, the molecular sieve material can be divided into small, medium, large and ultra large pore molecular sieves, with corresponding 8-membered rings (i.e. from 8 TO)4Tetrahedral formation), less than 10-membered rings, less than 12-membered rings, and greater than 12-membered rings. Molecular sieve materials successfully used in industry have pore sizes below 1nm, which limits the molecular size and shape of the reaction substrate during adsorption, separation and catalysis, and is an artificial brake for the practical application of molecular sieve materials. Due to the large pore channels, the ultra-large pore molecular sieve has huge application prospects in the aspects of cracking processes, fine chemical production, selective catalysis and macromolecular separation, and attracts the attention of chemists and industries for a long time. Although the synthesis of very large pore molecular sieves has been a tremendous advance over the past decades, the preparation of stable very large pore molecular sieves remains a challenge.
Crystallization of ultra-large pore silicate molecular sieves is very difficult, and the number of synthesized silicate molecular sieve materials having an ultra-large pore structure is very limited. In recent years, the successful synthesis of ultra-large pore molecular sieves has been attributed primarily to the use of specific organic structure directing agents and heteroatoms in the synthesis. Among them, the existence of germanium has lower geometrical constraint on the formation of primary structural units, so that the primary structural units tend to form double four-membered rings or double three-membered rings, and the ultra-large pore molecular sieve is easier to form, thereby leading to the synthesis of a series of silicon germanate molecular sieves. Germanium is a relatively rare and expensive element, and the poor hydrothermal stability of the silicon germanosilicate molecular sieve limits its industrial application.
The ultra large pore silicon germanate molecular sieve ITQ-44 of IRR structure (IRR is the structure code identified by the international molecular sieve association) has 18 × 12 × 12 intersecting three-dimensional channels and a secondary structural unit consisting of a double ternary ring cage (j.jiang, j.l. jorda, m.j).
J.yu, a.corma, angelw.chem.int.ed.2010, 49: 4986). The three-dimensional channel has an eighteen-membered ring channel in the direction of a unit cell c, and each of the a and b directions has a twelve-membered ring channel to form a channel structure crossed with the eighteen-membered ring channel. Unfortunately, the presence of large amounts of germanium in the ITQ-44 framework, not only is costly, but also limits the hydrothermal stability of this material, largely limiting its industrial application, while the structure still does not synthesize pure silicate (silica) and aluminosilicate forms. The pure silicate and aluminosilicate molecular sieves have good hydrothermal stability, and aluminum atoms are introduced into acid sites, so that the pure silicate and aluminosilicate molecular sieves can be directly used for acid catalysis. Therefore, the synthesis and development of the pure silicate and aluminosilicate zeolite molecular sieve with the ultra-large pore IRR structure have very important application value.
Disclosure of Invention
The invention aims to provide an ultra-large pore silicate molecular sieve with an IRR structure, which can be obtained by a hydrothermal synthesis method and promoted crystallization by using an organic template and a certain amount of IRR seed crystals (containing germanium or not containing germanium). The super-macroporous IRR structure silicate molecular sieve has an IRR framework crystal structure, does not contain germanium element in a framework, has good hydrothermal stability, and provides a new choice for application of a molecular sieve material in industrial catalysis.
The technical scheme of the invention is as follows:
a super-macroporous silicate molecular sieve with IRR skeleton crystal structure and p (M) as chemical composition1/ nXO2)·qYO2·SiO2Wherein M represents a proton or an inorganic cation of + n valency; x represents one or more trivalent elements; y represents one or more tetravalent elements other than silicon and germanium; p is 0-0.03 and q is 0-0.03.
Preferably M represents a proton or sodium; x is Al or B, X is Ti, and p is 0-0.02; q is 0-0.02.
The super-macroporous IRR structure silicate molecular sieve can be prepared by the following method, and comprises the following steps: (1) proportionally mixing silicon sourceThe material, boron family element compound, tetravalent element compound except silicon and germanium, organic template agent, fluorine source material, IRR Seed crystal Seed and water are uniformly mixed under stirring, the reaction can be carried out under the conditions of static and dynamic stirring, and reaction gel is obtained, wherein the chemical composition of the reaction gel is as follows: rROH, aHF, xX2O3:yYO2:SiO2:bSeed:wH2O, wherein R represents a positively charged group of the organic templating agent; x represents one or more trivalent elements, preferably X is Al or B; y represents one or more tetravalent elements other than silicon and germanium, preferably Y is Ti; 0.1 to 1.0, 0 to 1.0 a, 0.001 to 0.05 b, 0 to 0.03 x, 0 to 0.03 y, 1 to 50 w, preferably 0.5 to 0.75 r, 0.5 to 0.75 a, 0.01 to 0.05 b, 0 to 0.02 x, 0 to 0.02 y, 1 to 10 w; r is Ar- (im)+An organic cation, wherein Ar represents para-and meta-substituted tert-butylbenzyl, and im represents N-substituted imidazole;
(2) removing excessive solvent (such as under infrared lamp or 80 deg.C oven) from the reaction gel to theoretical weight, transferring the reaction gel into a stainless steel reaction kettle, and reacting at 140-170 deg.C under sealed condition for 7-30 days, preferably 14-20 days;
(3) and (3) washing and drying the product crystallized in the step (2), and roasting for 2-5 hours at 400-650 ℃ in the air atmosphere to obtain the super-macroporous silicate molecular sieve without the template agent.
Preferably, the silicon source material is one or more of water glass, silica sol, ethyl orthosilicate or butyl orthosilicate. The boron compound is preferably one or more of sodium metaaluminate, aluminum isopropoxide, aluminum sulfate hexadecahydrate, aluminum hydroxide or boric acid. Preferably, the fluorine source material is hydrofluoric acid and/or ammonium fluoride. The tetravalent element compound other than silicon and germanium is preferably tetra-n-butyl titanate, tin dioxide.
In the preparation method of the ultra-large pore molecular sieve, the organic template is tert-butyl benzyl imidazolium salt, and the positive charge group R is preferably listed in Table 1.
TABLE 1
The IRR Seed crystal Seed is an IRR structure molecular sieve of silicate germanate, pure silicate, aluminosilicate or silicate titanate. The IRR silicon germanosilicate ITQ-44 can be prepared by adding a germanium element-containing compound, such as germanium dioxide, in the step (1) on the basis of the preparation method disclosed by the invention. Or by literature methods (e.g., j.jiang, j.l.jorda, m.j).
Yu, a.corma, angelw.chem.int.ed.2010, 49: 4986; r.bai, q.sun, n.wang, y.zou, g.guo, s.iborra, a.corma, j.yu, chem.mater.2016,28:6455) to form ITQ-44 germanosilicate. The pure silicate, aluminosilicate or titanosilicate molecular sieves of the present invention may be further seeded for large scale production.
In the above method, before the reaction gel is prepared, the organic template is exchanged to the form of hydroxide base (ROH) through an ion exchange resin, and the concentration of the organic template is calibrated by 0.1M hydrochloric acid solution for later use.
If the silicon titanate or silicon silicate molecular sieve is prepared, firstly, a compound containing titanium or germanium elements is added into the obtained basic template solution, the mixture is stirred and dissolved, then a silicon source is added and the mixture is continuously stirred, finally, a corresponding boron group element compound is added, a fluorine source substance is added after the mixture is uniformly stirred, and the mixture is heated under an infrared lamp or in an oven to remove redundant solvent in the system, so that the target gel is obtained.
The invention has the advantages that:
the invention utilizes a specific template agent, adds a certain IRR structure seed crystal (containing germanium or not), and prepares the silicate molecular sieve with a micro-germanium or germanium-free ultra-large pore IRR structure by hydrothermal synthesis, thereby avoiding the defect that the prior molecular sieve with the structure can obtain pure silicate and aluminosilicate molecular sieve with the IRR structure by synthesizing the silicon germanate ITQ-44 with germanium and then supplementing silicon or aluminum by removing germanium and supplementing silicon. The silicate molecular sieve with the IRR structure prepared by the invention has 18-membered pore channels in the c direction of the crystal axis and 12-membered pore channels in the a and b directions, has good thermal stability, can be doped with heteroatoms and has potential application value in the field of catalysis.
Drawings
FIG. 1 is an X-ray powder diffraction pattern (Cu target) of the synthesized product.
FIG. 2 is a scanning electron micrograph of the synthesized all-silicon molecular sieve product.
Detailed Description
The following examples illustrate specific steps of the present invention, but are not intended to limit the invention.
Terms used in the present invention generally have meanings commonly understood by those of ordinary skill in the art, unless otherwise specified.
The present invention is described in further detail below with reference to specific examples and with reference to the data. It will be understood that these examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
In the following examples, various procedures and methods not described in detail are conventional methods well known in the art.
Example 1: the synthesis process of the template is described by taking template 1 in Table 1 as an example.
15mL of 4-tert-butyl benzyl chloride was dissolved in 150mL of tetrahydrofuran, and 6.2mL of 1-methylimidazole was added thereto, followed by reflux reaction for 2 days. Then cooled to room temperature, filtered to give a white solid product, washed with ether (3X 10mL), dried overnight under vacuum, yield 95%. Subjecting the product to liquid nuclear magnetic resonance (D)2O) and electrospray mass spectrometry, and identifying the target compound.
The obtained product is dissolved in 100mL deionized water, and ion exchange is carried out through 717 strongly basic anion exchange resin, so that the template agent aqueous alkali in the form of hydroxide radical can be obtained through exchange. The appropriate amount of this solution was weighed and calibrated with 0.1mol/L hydrochloric acid solution, phenolphthalein was used as the indicator. The calibration results confirmed that the exchange efficiency of the template 1 chloride salt to hydroxide base reached 94%.
The templating agents 2-4 in Table 1 were prepared according to the methods described above.
Example 2: according to the molar ratio of 1SiO2：0.2GeO2:0.5ROH：0.5HF：3H2O ratio preparing the gel synthesized by the molecular sieve, and the steps are as follows: weighing metered template agent 1 alkali solution, and respectively adding 02mmol (0.0209g) of germanium dioxide and 1mmol (0.2084g) of ethyl orthosilicate, stirring for about two hours at normal temperature to completely dissolve the germanium dioxide and the ethyl orthosilicate, then adding a designed amount of hydrofluoric acid solution, stirring uniformly, placing the mixed gel under an infrared lamp or in an oven at 80 ℃, and removing the excessive solvent to the theoretical weight. And transferring the finally obtained reaction gel into a 15mL stainless steel reaction kettle with a polytetrafluoroethylene lining, reacting for 15 days at 160 ℃ under a sealed condition, washing the product twice by water and twice by ethanol, and drying for later use. The results of single crystal X-ray diffraction tests carried out at-180 ℃ show that crystals crystallized from space group P6/mmm,
the molecular sieve is structurally isomorphic with ITQ-44, has 18-membered ring channels in the c direction of the crystal axis and 12-membered channels in the a and b directions, and is the silicon germanate molecular sieve ITQ-44 with IRR structure. And performing theoretical analysis fitting on the powder diffraction of the molecular sieve according to the single crystal X-ray result, wherein the result is consistent with the actual powder X-ray diffraction analysis result. The above-described silicon germanate molecular sieves can be used as seeds for the synthesis of silicate molecular sieves.
Example 3: according to the molar ratio of 1SiO2：0.75ROH：0.03Seed：0.75HF：3H2O ratio preparing the gel synthesized by the molecular sieve, and the steps are as follows: weighing a metered alkali solution of the template agent 1, adding 1mmol (0.2084g) of tetraethoxysilane, stirring for about two hours at normal temperature to completely dissolve the tetraethoxysilane, then adding a designed amount of hydrofluoric acid solution, uniformly stirring, finally adding 0.03mmol (0.0120g) of the product of example 2 serving as a seed crystal, placing the mixed gel under an infrared lamp or in an oven at 80 ℃, and removing the redundant solvent to the theoretical weight. And transferring the finally obtained reaction gel into a 15mL stainless steel reaction kettle with a polytetrafluoroethylene lining, reacting for 15 days at 160 ℃ under a sealed condition, washing the product twice by water and twice by ethanol, and drying for later use. The X-ray powder diffraction phase is identified as silicate molecular sieve (named NUD-16) with IRR structure, which is calcined at 550 deg.C in airThe template molecules are removed after 4 hours of burning, and the structure of the template molecules is kept stable, as shown in figure 1. Scanning electron microscopy showed that the product was spherical (see FIG. 2).
Example 4: according to the molar ratio of 1SiO2：0.5ROH：0.01Al2O3：0.03Seed：0.5NH4F：3H2O ratio preparing the gel synthesized by the molecular sieve, and the steps are as follows: weighing a metered alkali solution of the template agent 1, firstly adding 0.01mmol (0.0021g) of aluminum isopropoxide into the alkali solution, stirring for about half a hour, later adding 1mmol (0.2084g) of tetraethoxysilane, stirring for about two hours at normal temperature to completely dissolve the tetraethoxysilane, then adding a designed amount of ammonium fluoride solution, uniformly stirring, finally adding 0.03mmol (0.0120g) of the product of example 3 serving as a seed crystal, placing the mixed gel under an infrared lamp or in an oven at 80 ℃, and removing the redundant solvent to the theoretical weight. And transferring the finally obtained reaction gel into a 15mL stainless steel reaction kettle with a polytetrafluoroethylene lining, reacting for 20 days at 160 ℃ under a sealed condition, washing the product twice with water and twice with ethanol, and identifying the product as an aluminosilicate molecular sieve Al-NUD-16 with an IRR structure by an X-ray powder diffraction phase. The molecular sieve is calcined for 2 hours at 550 ℃ in the air atmosphere to remove the template agent molecules, and the structure of the molecular sieve is kept stable. The X-ray powder diffraction results of the molecular sieve are shown in fig. 1.
Example 5: according to the molar ratio of 1SiO2：0.75ROH：0.01TiO2：0.05Seed：0.75HF：3H2O ratio preparing the gel synthesized by the molecular sieve, and the steps are as follows: weighing a metered solution of the template agent 2 alkali, firstly adding 0.01mmol (0.0035g) of tetrabutyl titanate into the solution, stirring for about half a hour, later adding 1mmol (0.2084g) of tetraethoxysilane, stirring for about two hours at normal temperature to completely dissolve the tetraethoxysilane, then adding a designed amount of hydrofluoric acid solution, uniformly stirring, finally adding 0.05mmol (0.0200g) of the product of example 3 serving as a seed crystal, placing the mixed gel under an infrared lamp or in an oven at 80 ℃, and removing the redundant solvent to the theoretical weight. Transferring the finally obtained reaction gel into a 15mL stainless steel reaction kettle with a polytetrafluoroethylene lining, reacting for 15 days at 170 ℃ under a sealed condition, washing the product twice with water and ethanol, and identifying the product by X-ray powder diffractionThe silicon titanate molecular sieve is defined as a silicon titanate molecular sieve Ti-NUD-16 with an IRR structure. The molecular sieve is calcined for 2 hours at 550 ℃ in the air atmosphere to remove the template agent molecules, and the structure of the molecular sieve is kept stable. The X-ray powder diffraction results for the molecular sieve are substantially in accordance with figure 1.
Example 6: molecular sieve synthesis gel was prepared and synthesized according to the material ratios and procedure of example 3, except that the template used was an alkali solution of para-substituted methylbenzylimidazole cation. The resulting product was identified as amorphous by X-ray powder diffraction (as shown in figure 1).
Claims (9)
1. The super-macroporous silicate molecular sieve with IRR structure is characterized by having IRR framework crystal structure and having chemical composition form of p (M)1/nXO2)·qYO2·SiO2Wherein M represents a proton or an inorganic cation of + n valency; x represents one or more trivalent elements; y represents one or more tetravalent elements other than silicon and germanium; p is 0-0.03 and q is 0-0.03.
2. Molecular sieve according to claim 1, characterized in that M represents a proton or sodium, X is Al or B, Y is Ti, p ═ 0 to 0.02; q is 0-0.02.
3. The method for preparing the ultra-large pore IRR structure silicate molecular sieve according to claim 1 or 2, characterized by comprising the following steps:
(1) uniformly mixing a silicon source substance, a boron family element compound, a tetravalent element compound except silicon and germanium, an organic template agent, a fluorine source substance, an IRR Seed crystal Seed and water in proportion under stirring to obtain a reaction gel, wherein the reaction gel comprises the following chemical components: rROH, aHF, xX2O3:yYO2:SiO2:b Seed:wH2O, wherein R represents a positively charged group of the organic templating agent; x represents one or more trivalent boron group elements; y represents one or more tetravalent elements other than silicon and germanium, r is 0.1-1, a is 0-1, b is 0.001-0.05, x is 0-0.03, Y is 0-0.03, w is 1-50; r is Ar- (im)+Organic cations, in which Ar represents para-or meta-substitutedT-butylbenzyl, im represents an N-substituted imidazole;
(2) removing the excessive solvent from the reaction gel, transferring the reaction gel into a stainless steel reaction kettle, and reacting for 7-30 days at the temperature of 140-;
(3) and (3) washing and drying the product crystallized in the step (2), and roasting for 2-5 hours at 400-650 ℃ in the air atmosphere to obtain the super-macroporous silicate molecular sieve without the template agent.
4. The method according to claim 3, wherein step (1) X is Al and/or B.
5. The preparation method according to claim 3, wherein the silicon source material is selected from one or more of white carbon black, water glass, silica sol, ethyl orthosilicate and butyl orthosilicate; the boron group element compound is selected from one or more of sodium metaaluminate, aluminum isopropoxide, aluminum sulfate hexadecahydrate, aluminum hydroxide or boric acid; the fluorine source substance is hydrofluoric acid and/or ammonium fluoride; the tetravalent element compound except silicon and germanium is tetrabutyl titanate and/or tin dioxide.
6. The method according to claim 3 or 4, wherein the steps (1) r, a, x, y and w are: r-0.5-0.75, a-0.5-0.75, b-0.01-0.05, x-0.02, y-0.02, w-1-10.
7. The method according to claim 3, wherein R is selected from one or more of the following structures:
8. the method according to claim 3, wherein the IRR Seed is IRR structure molecular sieve of silicate germanate, pure silicate, aluminosilicate or titanosilicate.
9. The use of the extra-large pore IRR structure silicate molecular sieve of claim 1 or 2 as an adsorption material, a separation material, a catalyst in the chemical and chemical field.
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