CN113636570A - Preparation method of nano LEV molecular sieve - Google Patents
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Abstract
The invention discloses a preparation method of a nanometer LEV molecular sieve. The method comprises the following steps: mixing a silicon source, a framework trivalent element X source, a framework balance cation M source, an organic template agent Q and water, and carrying out crystallization reaction to obtain the nanometer LEV molecular sieve; wherein the organic template agent Q is selected from a material containing isopropyl trimethyl ammonium onium ions. The method has the advantages of short crystallization time, simple process and low synthesis cost. The obtained nano LEV molecular sieve can be used as an adsorbent or a catalyst.
Description
Technical Field
The invention relates to the field of molecular sieves, in particular to a preparation method of a nano LEV zeolite molecular sieve.
Background
The zeolite molecular sieve is a porous crystalline material, has a regular molecular size pore channel structure, stronger acidity and high hydrothermal stability, is widely applied to the fields of catalysis, adsorption, ion exchange and the like, and plays an irreplaceable role. At present, the molecular sieve topology approved by the international molecular sieve association has reached 248.
The LEV type zeolite molecular sieve has a two-dimensional eight-membered ring channel structure and a pore size of
In addition, the framework of the molecular sieve also contains [4 ]96583]A cage cavity of a heptadecahedron. The unique hole-cage structure enables the LEV zeolite to show larger application potential in catalytic processes of micromolecular gas separation, methanol-to-olefin, selective reduction of nitrogen oxides and the like.
LEV-structured, naturally occurring LEV chabazite (Levyne) occurs in nature and typically has a silica to alumina molar ratio Si/Al of 2. The framework composition, the crystal size and the morphology of the zeolite molecular sieve can be better controlled by artificially synthesizing the LEV zeolite by using the organic template. U.S. Pat. No. 4, 3459676 discloses a synthesis method of ZK-20 molecular sieve with LEV structure, wherein the template agent is methyl substituted 1, 4-diazabicyclo [2.2.2] octanium ion. Methods for the synthesis of LEV-type zeolite Nu-3 using quinuclidinium ions and an amantadine template are disclosed in european patents EP 0040016 and EP 0255770, respectively. US4495303 discloses a method for preparing LEV zeolite using diethyldimethylammonium ion as a template, with a synthesis cycle of over 20 days. In addition, there are related documents disclosing methods for preparing LEV zeolite using templating agents such as choline (microporus mesophorus mater, 2009,122, 149-. Wherein N, N-dimethylpiperidinium ion is used as a template agent, an FAU molecular sieve is used as a raw material, and the LEV zeolite (J.Mater.chem.A., 2017,5,19245-19254) with the crystal size of about 30nm can be prepared by a molecular sieve hydrothermal crystal transformation method. However, the above preparation method has the problem that the preparation cost of the molecular sieve is increased due to the fact that the template agent is expensive or the crystallization time is long.
From the perspective of catalytic application, the LEV molecular sieve of the nanocrystal can reduce the diffusion limitation of organic molecules in pores, thereby being beneficial to the reaction. Therefore, it is a hot spot of current research to provide a method for preparing a nano LEV molecular sieve with short synthesis time and low cost.
Disclosure of Invention
The invention aims to solve the problems of high price of a template agent used for synthesizing an LEV molecular sieve, long synthesis time and overlarge LEV molecular sieve crystal in the prior art, and provides a preparation method of a nano LEV molecular sieve.
The invention provides a preparation method of a nanometer LEV molecular sieve, which comprises the following steps: mixing a silicon source, a framework trivalent element X source, a framework balance cation M source, an organic template agent Q and water, and carrying out crystallization reaction to obtain the nanometer LEV molecular sieve; wherein the organic template agent Q is selected from a material containing isopropyl trimethyl ammonium onium ions.
Further, the preparation method can also comprise the step of mixing a non-silicon framework tetravalent element Y source, a silicon source, a framework trivalent element X source, a framework equilibrium cation M source, an organic template agent Q and water together to perform crystallization reaction to obtain the nano LEV molecular sieve.
Further, the structural formula of the isopropyltrimethylammonium onium ion is as follows:
further, the organic template Q is preferably an isopropyl trimethylammonium onium ion-containing hydroxide, such as isopropyl trimethylammonium hydroxide.
Further, the silicon source is at least one selected from water glass, silica sol, solid silica gel, fumed silica, amorphous silica, diatomite, zeolite molecular sieve and tetraalkoxysilane.
Further, the framework trivalent element X source is at least one of an aluminum source, a boron source, an iron source, a gallium source, an indium source and a chromium source; wherein the aluminum source is at least one selected from aluminum sulfate, sodium aluminate, aluminum nitrate, aluminum chloride, pseudo-boehmite, alumina, aluminum hydroxide, silicon-aluminum zeolite molecular sieve, aluminum carbonate, simple substance aluminum, aluminum isopropoxide and aluminum acetate; the boron source is selected from at least one of boric acid, sodium tetraborate, amorphous boron oxide, potassium borate, sodium metaborate, ammonium tetraborate and organic borate; the iron source is at least one selected from ferric sulfate, ferric nitrate, ferric halide (such as ferric trichloride), ferrocene and ferric citrate; the gallium source, indium source and chromium source are selected from the conventional substances in the field, such as gallium oxide, gallium nitrate, indium oxide, indium nitrate, chromium chloride, chromium nitrate and the like.
Further, the framework balancing cation M is at least one selected from the group consisting of a hydrogen ion, an ammonium ion, a sodium ion, a potassium ion, a lithium ion, a rubidium ion, a cesium ion, a magnesium ion, a calcium ion, a strontium ion, and a barium ion, and preferably contains at least a sodium ion or at least a sodium ion and a potassium ion.
The framework-balancing cation M source preferably comprises at least a sodium source or at least a sodium source and a potassium source. The sodium source is selected from at least one of sodium oxide, sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium chloride, sodium nitrate, sodium sulfate and sodium fluoride; the potassium source is at least one of potassium oxide, potassium hydroxide, potassium carbonate, potassium bicarbonate, potassium chloride, potassium nitrate, potassium sulfate and potassium fluoride.
Further, the non-silicon framework tetravalent element Y source is preferably at least one selected from the group consisting of a germanium source, a tin source, a titanium source, a zirconium source and a hafnium source; more preferably at least one selected from the group consisting of a germanium oxide source, a tin oxide source, a titanium oxide source, a zirconium oxide source, and a hafnium oxide source.
Further, the organic template agent Q,The silicon source is SiO2As measured), the X source (in X)2O3As measured), the M source (in M)2O is calculated) and water in a molar ratio of Q to SiO2:X2O3:M2O:H2O is 0.08 to 0.8:1:0.0045 to 0.07:0 to 0.5:1 to 30, and preferably Q is SiO2:X2O3:M2O:H2O＝0.17～0.5:1:0.01～0.05:0.05～0.4:4～12。
Further, the non-silicon skeleton tetravalent element Y source (corresponding oxide YO)2Calculated) and the silicon source (in terms of SiO)2Calculated) of the molar ratio YO2/SiO 20 to 0.1, preferably YO2/SiO2＝0.01～0.08。
Further, the crystallization conditions include: crystallizing at 100-200 deg.C for 24-300 hr; preferably, the crystallization is carried out for 36 to 250 hours at the temperature of 110 to 190 ℃; more preferably, the crystallization is carried out at 120 to 180 ℃ for 48 to 200 hours.
Further, after the crystallization reaction is finished, performing conventional post-treatment, such as filtering, washing and drying to obtain the molecular sieve; and optionally, a step of calcining the obtained molecular sieve.
Further, the nanometer LEV molecular sieve obtained by the method has a formula of SiO2·1/x XO1.5·m MO0.5"wherein X is a framework trivalent element, the molar ratio of Si/X is more than or equal to 7 and less than or equal to 100, M is a framework equilibrium cation, and the molar ratio of M/Si is more than or equal to 0.02 and less than or equal to 0.6; the nanometer LEV molecular sieve has an X-ray diffraction pattern shown as the following table:
furthermore, the average grain diameter of the crystal of the nano LEV molecular sieve obtained by the method is 80-200 nm, and the specific surface area is 600m2More than g.
In a second aspect, the invention provides a molecular sieve, prepared by the above method.
In a third aspect, the invention provides a molecular sieve composition comprising a nano LEV molecular sieve prepared according to the method of any one of the preceding aspects, and a binder.
In a fourth aspect, the present invention provides the use of a molecular sieve, a nano LEV molecular sieve prepared according to the method of any one of the preceding aspects, or a nano LEV molecular sieve composition according to any one of the preceding aspects as an adsorbent or catalyst.
The method for preparing the nano LEV molecular sieve adopts the low-price organic template agent, has short required crystallization time and simple process, and is beneficial to realizing industrial popularization.
The nanometer LEV molecular sieve prepared by the method has nanometer crystals, regular molecular size pore channel structures, stronger acidity and ion exchange performance and high thermal and hydrothermal stability. Particularly, the crystal grain size is small, so that the problem of mass transfer and diffusion obstruction in the hole caused by overlarge crystals is avoided; and various elements such as Al, Ti, Zr, Fe and the like can be introduced into the framework to generate different catalytic active centers, so that the requirements of different catalytic reactions are met.
Drawings
FIG. 1 is an X-ray diffraction (XRD) pattern of a final sample obtained in example 1;
fig. 2 is a Scanning Electron Microscope (SEM) photograph of the final sample obtained in example 1.
Detailed Description
In order to facilitate understanding of the invention, the following examples are set forth. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention. The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values.
In the context of this specification, in the XRD data of molecular sieves, vw, w, m, s, vs represent diffraction peak intensities, vw being very weak, w being weak, m being medium, s being strong, vs being very strong, as is well known to those skilled in the art. Generally, vw is less than 5; w is 5-20; m is 20 to 40; s is 40-70; vs is greater than 70.
In the context of the present specification, the structure of a molecular sieve is determined by X-ray diffraction (XRD) which is determined by X-ray powder diffractometry using a Cu-ka radiation source, K α 1 wavelength λ 1.5405980 angstroms
A nickel filter.
In the invention, an X' Pert PRO type X-ray powder diffraction (XRD) instrument of Dutch Pasnake company is adopted, the working voltage is 40kV, the current is 40mA, and the scanning range is 5-40 degrees. The morphology of the product was photographed by a field emission scanning electron microscope (Fe-SEM) of model S-4800 of HITACHI, Japan.
It should be expressly understood that two or more of the aspects (or embodiments) disclosed in the context of this specification can be combined with each other as desired, and that such combined aspects (e.g., methods or systems) are incorporated in and constitute a part of this original disclosure, while remaining within the scope of the present invention.
Unless otherwise expressly indicated, all percentages, parts, ratios, etc. mentioned in this specification are by weight unless otherwise not in accordance with the conventional knowledge of those skilled in the art.
[ example 1 ]
2.5g of sodium metaaluminate (Al)2O3 41wt％,Na258 percent by weight of O, 1.8g of sodium hydroxide solution (30 percent by weight) and 11.2g of potassium hydroxide solution (30 percent by weight) are added into 39.4g of isopropyl trimethyl ammonium hydroxide solution (20 percent by weight) and stirred uniformly, 60g of Ludox AS-40 silica sol is slowly added into the mixture under stirring, the mixture is heated to 60 ℃ after being stirred for 1 hour, and 25.6g of water is volatilized by opening. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 72 hours. And filtering the reacted solid, washing with distilled water and drying at 100 ℃ to obtain the raw powder LEV molecular sieve. And (3) placing the raw powder solid in a muffle furnace, and roasting at the temperature of 550 ℃ for 5 hours to obtain a final product, wherein an XRD (X-ray diffraction) spectrum is shown in figure 1. The average grain size of LEV molecular sieve grains is about 80nm, and an SEM photograph is shown in figure 2. WhereinThe XRD spectrum data of the final product obtained in example 1 are shown in Table 1:
TABLE 1
[ example 2]
Adding 18g sodium hydroxide solution (30 wt%) into 39.4g isopropyl trimethyl ammonium hydroxide solution (20 wt%), stirring, slowly adding 42g Ludox AS-40 silica sol under stirring, stirring for 1h, adding 8.2g USY molecular Sieve (SiO)2/Al2O312) was stirred for 1.5h and the mixture was heated to 60 c and 17.3g of water was evaporated open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 72 hours. After the reaction, the solid is filtered, washed, dried and roasted (the reaction conditions of the post-treatment are the same as those of example 1), and the obtained solid is an LEV molecular sieve, and the XRD pattern of the solid is similar to that of figure 1. The average grain size of the obtained LEV molecular sieve is about 90 nm. Wherein, the XRD spectrum data of the final product obtained in example 2 is shown in Table 2:
TABLE 2
[ example 3 ]
2.5g of aluminum sulfate octadecahydrate, 10g of sodium hydroxide solution (30 wt%) and 6g of potassium hydroxide solution (30 wt%) are added into 29.6g of isopropyl trimethyl ammonium hydroxide solution (20 wt%) and stirred uniformly, 45g of Ludox AS-40 silica sol is slowly added under stirring, after stirring for 1h, the mixture is heated to 60 ℃ and 26.4g of water is volatilized open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is put into a drying oven at 150 ℃ for crystallization for 96 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as those in example 1), and the obtained solid is the LEV molecular sieve, and the XRD pattern of the solid is similar to that of figure 1. The average grain size of the obtained LEV molecular sieve is about 150 nm. Wherein, the XRD spectrum data of the final product obtained in example 3 is shown in Table 3:
TABLE 3
[ example 4 ]
0.6g of pseudo-boehmite (Al)2O370wt percent), 5g of sodium hydroxide solution (30wt percent), 4g of potassium hydroxide solution (30wt percent) are added into 42g of isopropyl trimethyl ammonium hydroxide solution (20wt percent) and stirred evenly, and 10g of water glass (SiO) is slowly added into the mixture under stirring2 27wt％，Na2O8.4 wt%) and 35g Ludox AS-40 silica sol, and after stirring for 1h the mixture was heated to 60 ℃ and 20g of water was evaporated open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in an oven at 165 ℃ for crystallization for 120 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as those in example 1), and the obtained solid is the LEV molecular sieve, and the XRD pattern of the solid is similar to that of figure 1. The average grain size of the obtained LEV molecular sieve is about 120 nm.
[ example 5 ]
Dissolving 9.7g of rubidium chloride and 16g of sodium hydroxide solution (30 wt%) in 39.4g of isopropyl trimethyl ammonium hydroxide solution (20 wt%) and uniformly stirring, slowly adding 42g of Ludox AS-40 silica sol while stirring, stirring for 1h and then adding 8.2g of USY molecular Sieve (SiO)2/Al2O312) was stirred for 1.5h and the mixture was heated to 60 c and 15g of water was evaporated open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed into an oven at 145 ℃ for crystallization for 100 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as those in example 1), and the obtained solid is the LEV molecular sieve, and the XRD pattern of the solid is similar to that of figure 1. The average grain size of the obtained LEV molecular sieve is about 100 nm.
[ example 6 ]
Dissolving 8.9g of calcium chloride in 16g of sodium hydroxide solution (30 wt%), 39.4g of isopropyl trimethyl ammonium hydroxide solution (20 wt%) and 10g of water, stirring uniformly, slowly adding 42g of Ludox AS-40 silica sol while stirring, stirring for 1h, and adding 8.2g of USY molecular Sieve (SiO)2/Al2O312). Stirring for 1.5h, placing the mixture into a crystallization kettle with a polytetrafluoroethylene lining, and placing the crystallization kettle in an oven at 155 ℃ for crystallization for 80 h. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as those in example 1), and the obtained solid is the LEV molecular sieve, and the XRD pattern of the solid is similar to that of figure 2. The average grain size of the obtained LEV molecular sieve is about 130 nm.
[ example 7 ]
1.5g of boric acid, 12g of sodium hydroxide solution (30 wt%) and 11g of potassium hydroxide solution (30 wt%) are dissolved in 49.3g of isopropyl trimethyl ammonium hydroxide solution (20 wt%) and stirred uniformly, 75g of Ludox AS-40 silica sol is slowly added under stirring, after stirring for 1h, the mixture is heated to 60 ℃ and 40g of water is volatilized open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 14 hours. And filtering, washing, drying and roasting the reacted solid to obtain the solid LEV molecular sieve, wherein the XRD pattern of the solid LEV molecular sieve is similar to that of figure 1. The average grain size of the obtained LEV molecular sieve is about 165 nm. The XRD spectrum data of the final product obtained in example 7 is shown in Table 4:
TABLE 4
[ example 8 ]
0.75g of boric acid, 2.8g of sodium metaaluminate (Al)2O3 41wt％,Na2O58 wt%) is dissolved in 8g of sodium hydroxide solution (30 wt%) and 10g of potassium hydroxide solution (30 wt%), 68g of isopropyl trimethyl ammonium hydroxide solution (20 wt%) is added and stirred uniformly, 75g of Ludox AS-40 silica sol is slowly added under stirring, after stirring for 1h, the mixture is heated to 60 ℃, and 10g of water is volatilized in an open air. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 120 hours. And filtering, washing, drying and roasting the reacted solid to obtain the solid LEV molecular sieve, wherein an XRD (X-ray diffraction) spectrum of the solid LEV molecular sieve is similar to that of figure 1. The crystal size of the obtained LEV molecular sieve is about 180 nm.
[ example 9 ]
Dissolving 3g of aluminum sulfate octadecahydrate and 2.2g of ferric nitrate into 15g of sodium hydroxide solution (30 wt%), adding 60g of isopropyl trimethyl ammonium hydroxide solution (20 wt%), stirring uniformly, slowly adding 42g of Ludox AS-40 silica sol while stirring, stirring for 1h, heating the mixture to 60 ℃, and volatilizing 45g of water by opening. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed into an oven at 165 ℃ for crystallization for 144 hours. And filtering, washing, drying and roasting the reacted solid to obtain the solid LEV molecular sieve, wherein an XRD (X-ray diffraction) spectrum of the solid LEV molecular sieve is similar to that of figure 1. The crystal size of the obtained LEV molecular sieve is about 190 nm. The XRD spectrum data of the final product obtained in example 9 is shown in Table 5:
TABLE 5
Comparative example 1
2.5g of sodium metaaluminate (Al)2O3 41wt％,Na2O58 wt percent), 1.8g of sodium hydroxide solution (30wt percent) and 11.2g of potassium hydroxide solution (30wt percent) are added into 30g of tetramethylammonium hydroxide solution (20wt percent) and stirred uniformly, finally 60g of Ludox AS-40 silica sol is slowly added into the mixture under stirring, the mixture is heated to 60 ℃ after being stirred for 1h, and 18g of water is volatilized by opening. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 72 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as in example 1), so that the molecular sieve is obtained, and the molecular sieve is an RUT molecular sieve through XRD pattern analysis, wherein the XRD pattern of the molecular sieve is obviously different from that of figure 1.
Comparative example 2
2.5g of sodium metaaluminate (Al)2O3 41wt％,Na2O58 wt%), 1.8g of sodium hydroxide solution (30 wt%), 11.2g of potassium hydroxide solution (30 wt%) were added to 48.7g of tetraethylammonium hydroxide solution (20 wt%), finally 60g of Ludox AS-40 silica sol were slowly added with stirring, after stirring for 1h the mixture was heated to 60 ℃ and 33g of water were evaporated open. Placing the above mixture in a crystallization kettle with polytetrafluoroethylene lining, and standing at 160 deg.CCrystallizing in an oven for 72 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as those in example 1), and then the molecular sieve is obtained, and the XRD pattern of the BEA molecular sieve is obviously different from that in figure 1 after the analysis of the XRD pattern.
Comparative example 3
2.5g of sodium metaaluminate (Al)2O3 41wt％,Na258 percent by weight of O, 1.8g of sodium hydroxide solution (30 percent by weight) and 11.2g of potassium hydroxide solution (30 percent by weight) are added into 40.5 g of diethyldimethylammonium hydroxide solution (20 percent by weight) and stirred uniformly, finally 60g of Ludox AS-40 silica sol is slowly added into the mixture under stirring, the mixture is heated to 60 ℃ after being stirred for 1 hour, and 26g of water is volatilized in an open air mode. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 72 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as in example 1), so that the molecular sieve is obtained, and the MWW molecular sieve is analyzed by an XRD (X-ray diffraction) pattern, wherein the XRD pattern of the MWW molecular sieve is obviously different from that of figure 1.
Comparative example 4
2.5g of sodium metaaluminate (Al)2O3 41wt％,Na2O58 wt%), 1.8g of sodium hydroxide solution (30 wt%), 11.2g of potassium hydroxide solution (30 wt%) were added to 41g of choline hydroxide solution (20 wt%), finally 60g of Ludox AS-40 silica sol was slowly added with stirring, after stirring for 1h the mixture was heated to 60 ℃ and 26g of water was evaporated open. The mixture is put into a crystallization kettle with a polytetrafluoroethylene lining and is placed in a 160 ℃ oven for crystallization for 72 hours. After the reaction, the solid is filtered, washed, dried and roasted (the post-treatment reaction conditions are the same as in example 1), so that the molecular sieve is obtained, and the MWW molecular sieve is analyzed by an XRD (X-ray diffraction) pattern, wherein the XRD pattern of the MWW molecular sieve is obviously different from that of figure 1.
Claims (14)
1. A method for preparing a nano LEV molecular sieve comprises the following steps: mixing a silicon source, a framework trivalent element X source, a framework balance cation M source, an organic template agent Q and water, and carrying out crystallization reaction to obtain the nanometer LEV molecular sieve; wherein the organic template agent Q is selected from a material containing isopropyl trimethyl ammonium onium ions.
2. The method according to claim 1, wherein a non-silicon framework tetravalent element Y source is mixed with the silicon source, a framework trivalent element X source, a framework equilibrium cation M source, an organic template Q and water to perform a crystallization reaction, thereby obtaining the nano LEV molecular sieve.
3. The method of claim 1, wherein the isopropyltrimethylammonium onium ion has the formula:
4. a method according to claim 1 or 3, wherein the organic template Q is an isopropyltrimethylammonium onium ion containing hydroxide, preferably isopropyltrimethylammonium hydroxide.
5. The method according to claim 1, wherein the framework trivalent element X source is at least one of an aluminum source, a boron source, an iron source, a gallium source, an indium source and a chromium source.
6. The method of claim 1, wherein the framework balancing cations M are selected from at least one of hydrogen ions, ammonium ions, sodium ions, potassium ions, lithium ions, rubidium ions, cesium ions, magnesium ions, calcium ions, strontium ions, and barium ions.
7. The method according to claim 2, wherein the source of tetravalent element Y of the non-silicon skeleton is at least one selected from the group consisting of a germanium source, a tin source, a titanium source, a zirconium source and a hafnium source.
8. The method of claim 1 or 2, wherein the organic template Q and the silicon source are SiO2For the purpose of counting, the X source is X2O3In order to count, the M source is M2The molar ratio of O to water is Q to SiO2:X2O3:M2O:H20.08-0.8: 1: 0.0045-0.07: 0-0.5: 1-30; preferably Q is SiO2:X2O3:M2O:H2O＝0.17～0.5:1:0.01～0.05:0.05～0.4:4～12。
9. The method according to claim 2, wherein the source of tetravalent element Y of the non-silicon skeleton is the corresponding oxide YO2The silicon source is counted by SiO2Calculated molar ratio YO2/SiO2＝0.01～0.08。
10. The method according to claim 1 or 2, wherein the crystallization conditions comprise: crystallizing at 100-200 deg.C for 24-300 hr; preferably, the crystallization is carried out for 36 to 250 hours at 110 to 190 ℃.
11. A nano LEV molecular sieve characterized by: prepared by the process of any one of claims 1 to 10.
12. The molecular sieve of claim 11, wherein the obtained nano LEV molecular sieve has an average crystal particle size of 80-200 nm and a specific surface area of 600m2More than g.
13. A molecular sieve composition comprising the molecular sieve of claim 11 or 12, and a binder.
14. Use of the nano LEV molecular sieve of claim 11 or 12 or the molecular sieve composition of claim 13 as an adsorbent or catalyst.
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