Method for synthesizing and preparing ZSM-22 molecular sieve under conditions of no organic template and no crystal seed

A technology without organic templates and molecular sieves, applied in the direction of crystalline aluminosilicate zeolites, etc., can solve the problems restricting the industrial application of ZSM-22 molecular sieves, and achieve good catalytic reaction activity, high yield, good crystallinity and purity.

Inactive Publication Date: 2015-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This restricts the industrial application of ZSM-22 molecular sieve to a certain extent

Method used

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  • Method for synthesizing and preparing ZSM-22 molecular sieve under conditions of no organic template and no crystal seed
  • Method for synthesizing and preparing ZSM-22 molecular sieve under conditions of no organic template and no crystal seed

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Experimental program
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Effect test

Embodiment 2

[0023] Embodiment 2 replaces KOH with NaOH as alkali source

[0024] First, 25g H 2 O and 0.30g NaOH were mixed evenly, then 0.21g aluminum sulfate was added thereto, after stirring for clarification, 6g tetraethyl orthosilicate (TEOS) was added, and the stirring was continued until the solution became uniform to form a silica-alumina gel. Then add the gel into a polytetrafluoroethylene stainless steel reaction kettle, the dynamic kettle speed is 50rpm, crystallize at 150°C for 2 days and then completely crystallize, the product is suction filtered and dried to obtain the product. In this reaction system, the molar ratio of the components satisfies, SiO 2 :Al 2 o 3 :Na 2 O:H 2 O is 1:0.011:0.125:55.7.

Embodiment 3

[0025] Preparation of ZSM-22 without organic template and seed crystal method under relatively high alkalinity conditions in embodiment 3

[0026] First, 25g H 2 Mix O with 0.81g KOH or 0.60g NaOH evenly, then add 0.21g aluminum sulfate to it, stir to clarify, add 6g tetraethyl orthosilicate (TEOS), continue stirring until the solution becomes uniform and forms a silica-alumina gel. Then the gel was added into a polytetrafluoroethylene stainless steel reaction kettle, the dynamic kettle rotation speed was 50 rpm, crystallized at 150° C. for 2 days, the product was suction filtered and dried to obtain the product. In this reaction system, the molar ratio of the components satisfies, SiO 2 :Al 2 o 3 :K 2 O / Na 2 O:H 2 O is 1:0.011:0.25:55.7. The obtained product is analyzed by X-ray diffraction, and its composition is white silica and ZSM-22 molecular sieve.

Embodiment 4

[0027] Preparation of ZSM-22 without organic template and seed crystal method under relatively low alkalinity conditions in embodiment 4

[0028] First, 25g H 2 Mix O with 0.097g KOH or 0.072g NaOH evenly, then add 0.21g aluminum sulfate to it, stir to clarify, then add 6g tetraethyl orthosilicate (TEOS), continue to stir until the solution becomes uniform and forms a silica-alumina gel. Then the gel was added into a polytetrafluoroethylene stainless steel reaction kettle, the dynamic kettle rotation speed was 50 rpm, crystallized at 150° C. for 2 days, the product was suction filtered and dried to obtain the product. In this reaction system, the molar ratio of the components satisfies, SiO 2 :Al 2 o 3 :K 2 O / Na 2 O:H 2 O is 1:0.011:0.03:55.7. The obtained product is analyzed by X-ray diffraction and its composition is amorphous and ZSM-22 molecular sieve.

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Abstract

The invention relates to the field of preparation of molecular sieves, and aims to provide a method for synthesizing and preparing a ZSM-22 molecular sieve under the conditions of no organic template and no crystal seed. The method comprises the following steps: uniformly mixing deionized water and an alkali source, adding aluminum sulfate, adding a silicon source under stirring conditions, continuing stirring to form a silica-alumina gel, and carrying out crystallizing reaction on the obtained silica-alumina gel in a reaction kettle; after the reaction finishes, obtaining the product, carrying out vacuum filtration on the product, and drying to obtain the ZSM-22 molecular sieve raw powder. The method thoroughly avoids the use of the organic template agent, and lowers the crystallizing temperature on the premise that the crystallizing time is not obviously changed, thereby reducing the unnecessary energy consumption and environmental pollution in the production process. More importantly, the method has very high silicon raw material utilization ratio and high yield, thereby greatly saving the production cost and being beneficial to application in other industrial fields.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a method for synthesizing and preparing ZSM-22 molecular sieve without organic template and crystal seed. Background technique [0002] Zeolite molecular sieve is a crystalline material with regular micropore channels, strong acidity and large specific surface area, so it has good shape-selective catalytic performance. And because of its high thermal stability and hydrothermal stability, it has been widely used in the fields of petroleum refining, petrochemical and fine chemistry. In addition to being widely used in the traditional chemical industry, zeolite molecular sieves are now slowly showing their development potential in other related material fields. In the 1980s, Mobil Corporation of the United States developed ZSM-22 molecular sieve, whose skeleton includes five-membered rings, six-membered rings, and ten-membered ring structures. It is a high-silicon molecul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 孟祥举王叶青肖丰收
Owner ZHEJIANG UNIV
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