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Composite-structure molecular sieve and synthetic method thereof

A technology of composite structure and synthesis method, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problems of single pore size, low activity, weak acidity, etc., and achieve good stability and good catalysis. The effect of performance, good technical effect

Active Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] One of the technical problems to be solved by the present invention is that the porous material synthesized by the prior art has a single pore size, weak acidity and low activity.

Method used

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  • Composite-structure molecular sieve and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Synthesis of ZSM-5 / ZnVPI-8 Composite Molecular Sieve

[0032] Take 94.7 grams of sodium metasilicate and 15.5 grams of sodium hydroxide, dissolve it with 380 grams of distilled water to form solution A, take 21 grams of zinc nitrate, and make solution B with 35 grams of distilled water, slowly pour solution B into solution A, and stir vigorously , then add 9.8 gram of tetraethylammonium hydroxide and 4.2 gram of ethylenediamine (mixed templating agent is denoted as M), after stirring for a period of time, adjust the pH value at 11 with dilute sulfuric acid, control the molar ratio of the crystallization mixed solution as : SiO 2 :ZnO:NaOH:M:H 2 O=1:0.1:0.5:0.4:30, add 1.0 g ZSM-5 zeolite seed (SiO 2 / Al 2 o 3 =50, the grain size is 100nm), put the mixed solution in an autoclave, keep it warm at 120°C for 100 hours, take it out, wash it with water, wash it with alcohol twice, dry it at 120°C for 6 hours, and roast it at 550°C for 6 hours to obtain ZSM-5 / ZnVPI-8 comp...

Embodiment 2

[0034] Synthesis of ZSM-5 / ZnVPI-8 Composite Molecular Sieve

[0035] Take 245 grams of sodium metasilicate and 2.4 grams of lithium hydroxide, dissolve it with 2000 grams of distilled water to form solution A, take 542 grams of zinc nitrate, and make solution B with 1600 grams of distilled water, slowly pour solution B into solution A, and stir vigorously , then add 2101 grams of tetraethylammonium bromide (template agent is denoted as M), after stirring for a period of time, adjust the pH value at 9 with dilute nitric acid, and the molar proportion of the control crystallization mixed solution is: SiO 2 :ZnO:LiOH:M:H 2 O=1:1:0.05:5:100, add 5.0 g of ZSM-5 zeolite seed crystals (SiO 2 / Al 2 o 3 =20, the grain size is 300nm), put the mixed solution in an autoclave, keep it warm at 80°C for 200 hours, take it out, wash it with water, wash it with alcohol twice, dry it at 120°C for 6 hours, and roast it at 550°C for 6 hours to obtain ZSM-5 / ZnVPI-8 composite molecular sieve (w...

Embodiment 3

[0037] Synthesis of ZSM-5 / ZnVPI-8 Composite Molecular Sieve

[0038] Take 189.4 grams of sodium metasilicate and 80 grams of sodium hydroxide, dissolve it with 1400 grams of distilled water to form solution A, take 210 grams of zinc nitrate, and make solution B with 400 grams of distilled water, slowly pour solution B into solution A, and stir vigorously , then add 84 grams of tetraethylammonium bromide and 25.2 grams of ethylenediamine (the mixed template is denoted as M), after stirring for a period of time, adjust the pH value at 12 with dilute sulfuric acid, and control the molar proportion of the crystallization mixed solution as : SiO 2 :ZnO:NaOH:M:H 2 O=1:1:0.5:2.4:50, add 2.5 grams of ZSM-5 zeolite seed crystals (SiO 2 / Al 2 o 3 =200, the grain size is 30nm), put the mixed solution in an autoclave, keep it warm at 160°C for 54 hours, take it out, wash it with water, wash it with alcohol twice, dry it at 120°C for 6 hours, and roast it at 550°C for 6 hours to obtain...

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Abstract

The present invention relates to a composite-structure molecular sieve and a synthetic method thereof, and mainly solves the problems of single pore diameter, weak acidity and not-high activity of synthetic porous materials in the prior art. The problems can be well solved by the composite-structure molecular sieve, the composition of the composite-structure molecular sieve ZSM-5 / ZnVPI-8 is as follows: the molar ratio of n (ZnO): n (SiO2): n (Al2O3) is 1-100: 10-1000: 1, n represents the number of moles, and an XRD diffraction pattern has diffraction peaks at the position of 6.64 + / -0.1 angstroms,9.83 + / -0.07 angstroms,20.21 + / -0.1 angstroms, 21.14 + / -0.1 angstroms, 22.07 + / -0.1 angstroms, 23.22 + / -0.1 angstroms, 25.06 + / -0.01 angstroms, 26.64 + / -0.1 angstroms, 28.37 + / -0.1 angstroms, 7.96 + / -0.05 angstroms, 8.83 + / -0.05 angstroms, 13 diffraction occurs .23 + / -0.05 angstroms, 15.91 + / -0.01 angstroms, 25.91 + / -0.04 angstroms, 26.96 + / -0.02 angstroms, 45.05 + / -0.01 angstroms and 45.52 + / -0.01 angstroms. The composite-structure molecular sieve can be applied to industrial production of methanol downstream products.

Description

technical field [0001] The invention relates to a compound structure molecular sieve and a synthesis method thereof. Background technique [0002] Due to the wide range of internal pore size distribution and the rich diversity of topological structures, zeolite molecular sieve materials are widely used in the fields of adsorption, heterogeneous catalysis, carriers of various guest molecules, and ion exchange. They are mainly characterized by selective adsorption, and their unique pore system enables them to sieve molecules of different sizes, which is why this type of material is called "molecular sieve". In theory, only materials with adsorption capacity (guest molecule water or template can be removed) can be called microporous materials or molecular sieves. [0003] With the continuous exploration of zeolite applications and the need for new properties and new performances of scientific research and development, people have invested a lot of energy in the synthesis of ar...

Claims

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Application Information

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IPC IPC(8): C01B39/04C01B39/38B01J29/40
Inventor 乔健滕加伟杨为民
Owner CHINA PETROLEUM & CHEM CORP
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