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Method for directly synthesizing multi-stage ordered mesoporous molecular sieve

A technology of mesoporous molecular sieve and molecular sieve, which is applied in the directions of eight-sided crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of complex synthesis and high cost of multi-stage ordered mesoporous molecular sieves, and achieves high heat and water efficiency. Good thermal stability, high mechanical strength, and the effect of reducing production costs

Active Publication Date: 2013-05-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of complex process and high cost of synthesizing multi-level ordered mesoporous molecular sieves at present, and to provide a method for directly synthesizing multi-level ordered mesoporous molecular sieves

Method used

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  • Method for directly synthesizing multi-stage ordered mesoporous molecular sieve
  • Method for directly synthesizing multi-stage ordered mesoporous molecular sieve
  • Method for directly synthesizing multi-stage ordered mesoporous molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 5.13g tetraethyl orthosilicate, 2g water and 4g tetrapropyl ammonium hydroxide are mixed, at 25 o After C was stirred for 3 hours, 3.5ml of 6% NaOH solution was added thereto, and 2.36g of cetyltrimethylammonium bromide (CTAB) was added to obtain a gel mixture. The gel mixture was moved into a stainless steel synthesis kettle and sealed. at 155 o C crystallized for 24 hours to obtain the product after washing, drying and 550 o After calcination of C for 6 hours, a multi-level ordered mesoporous Silicalite-1 molecular sieve was obtained.

[0024] XRD characterization results ( figure 1 a and figure 2 a), Low-temperature nitrogen adsorption-desorption isotherm ( image 3 , Figure 4 ), SEM ( Figure 5 ) proves that the product is a Silicalite-1 molecular sieve with highly ordered mesoporous, high hydrothermal stability and hierarchical channels.

Embodiment 2

[0026] The sol (2.8 wt% Al 2 o 3 ), 2g of water and 4g of tetrapropylammonium hydroxide mixed at 25 o After C was stirred for 3 hours, 3.5ml 6% NaOH solution was added thereto, and then 5.1g CTAB was added to obtain a gel mixture. o C crystallized for 48 hours to obtain molecular sieve product after washing, drying and 550 o After calcination of C for 6 hours, a multi-level ordered mesoporous ZSM-5 molecular sieve was obtained.

Embodiment 3

[0028] 5.13g tetraethyl orthosilicate, 2g water and 4g tetrapropyl ammonium hydroxide are mixed, at 25 o After C was stirred for 3 hours, 3.5ml 6% NaOH solution was added thereto, and then 0.9g CTAB was added to obtain a gel mixture, and the gel mixture was moved into a stainless steel synthesis kettle for sealing, and o C crystallized for 48 hours to obtain the whole product of molecular sieve after washing, drying and 550 o After calcination of C for 6 hours, the whole of multi-level ordered mesoporous Silicalite-1 molecular sieve (now figure 1 b and 2b).

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Abstract

The invention relates to a method for directly synthesizing a multi-stage ordered mesoporous molecular sieve, which comprises the following steps that: a silicon source, an aluminum source, water and template agent are mixed to obtain a mixture; an alkali source and surfactant are added into the mixture, and a gel mixture is obtained; and the gel mixture is moved into a synthesis reactor to be sealed and subjected to crystallization reaction, washed, dried and calcinated, and the multi-stage ordered mesoporous molecular sieve is obtained. The method has the advantages of simple process and reduced production cost, and is applicable to industrialized production. The synthesized molecular sieve has the advantages of high-order mesopores, higher mechanical strength, good hydrothermal stability, and can be used in petroleum chemical industry, fine preparation of chemicals, environmental catalysis and other fields.

Description

technical field [0001] The invention belongs to a method for preparing molecular sieves, in particular to a method for directly synthesizing multilevel ordered mesoporous molecular sieves. Background technique [0002] Zeolite molecular sieves are widely used in the fields of catalysis, ion exchange, adsorption and separation due to their regular micropore channels, shape selectivity, good stability and adjustable catalytic performance. However, the small diameter of micropores (< 2nm) tends to affect the mass transfer and diffusion of reactants and products in the catalytic process, resulting in a decrease in activity and conversion rate, which reduces the efficiency and range of zeolite molecular sieve applications. Although mesoporous / macroporous materials are conducive to the adsorption and diffusion of macromolecules during the reaction process, the amorphous nature of the pore walls makes their hydrothermal stability, mechanical strength and catalytic activity poor,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04C01B39/24
Inventor 陈丰秋DO·孟辉程党国金炜阳詹晓力
Owner ZHEJIANG UNIV
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