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Porous silica/ZSM-5 molecule sieve catalyst preparation method

A technology of ZSM-5 and silica, applied in the field of shape-selective catalysis, can solve the problem of low para-selectivity, achieve the effects of improving comprehensive performance, expanding application range, and low price

Active Publication Date: 2013-09-04
广州光义化工科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low para-selectivity in the synthesis of p-xylene by alkylation of toluene methanol on ZSM-5 molecular sieve in the background technology, a preparation method of porous silica / ZSM-5 molecular sieve catalyst is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Add 1.5 grams of ZSM-5 molecular sieve to 10.0 grams of ethanol, disperse 6.0 grams of purified nano-attapulgite in 20.0 grams of acetone, and slowly add the nano-attapulgite dispersion at a temperature of 25°C Into the ZSM-5 molecular sieve dispersion, continue to stir after completion, keep warm for 2 hours, filter, wash, and dry to obtain attapulgite / ZSM-5 molecular sieve;

[0021] 2. Take 5.0 grams of the attapulgite / ZSM-5 molecular sieve prepared in step 1 and place it in a closed container, add 3.0 grams of iodine element, keep the temperature at 120°C for 2 hours, and cool to room temperature to obtain Porous silica / ZSM-5 molecular sieve catalyst.

Embodiment 2

[0023] 1. Add 3.0 grams of ZSM-5 molecular sieves to 10.0 grams of ethanol, disperse 3.0 grams of purified nano-attapulgite in 30.0 grams of tetrahydrofuran, and slowly add the nano-attapulgite dispersion at a temperature of 0°C Into the ZSM-5 molecular sieve dispersion, continue to stir after completion, keep warm for 2 hours, filter, wash, and dry to obtain attapulgite / ZSM-5 molecular sieve;

[0024] 2. Take 5.0 grams of the attapulgite / ZSM-5 molecular sieve prepared in step 1 and place it in a closed container, add 1.0 grams of iodine element, keep it warm at 110°C for 6 hours, and cool to room temperature to obtain Porous, like silica / ZSM-5 molecular sieve catalyst.

Embodiment 3

[0026] 1. Add 2.0 grams of ZSM-5 molecular sieves to 10.0 grams of ethanol, disperse 4.0 grams of purified nano-attapulgite in 20 grams of ethanol, and slowly add the nano-attapulgite dispersion at a temperature of 5°C Into the ZSM-5 molecular sieve dispersion, continue to stir after completion, keep the heat for 4 hours, filter, wash, and dry to obtain attapulgite / ZSM-5 molecular sieve;

[0027] 2. Take 5.0 grams of the attapulgite / ZSM-5 molecular sieve prepared in step 1 and place it in a closed container, add 2.0 grams of iodine element, keep it warm at 100°C for 4 hours, and cool to room temperature to obtain Porous silica / ZSM-5 molecular sieve catalyst.

[0028] Performance Evaluation of Porous Silica / ZSM-5 Molecular Sieve Catalyst

[0029] The following experiment evaluates the porous silica / ZSM-5 molecular sieve catalyst by alkylating toluene and methanol to synthesize p-xylene. The reaction conditions are: the molar ratio of toluene to methanol n (toluene): n (methano...

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Abstract

The present invention relates to a porous silica / ZSM-5 molecule sieve catalyst preparation method, and belongs to the technical field of shape selecting catalysis. The preparation method comprises: dispersing a ZSM-5 molecule sieve in ethanol, adding purified nanometer attapulgite to a hydrophilic organic solvent, slowly adding the obtained mixed solution to the ZSM-5 molecule sieve ethanol dispersion to prepare an attapulgite / ZSM-5 molecule sieve, and placing the prepared attapulgite / ZSM-5 molecule sieve in iodine vapor to prepare the porous silica / ZSM-5 molecule sieve catalyst. According to the present invention, the attapulgite / ZSM-5 molecule sieve is placed in the iodine vapor so as to provide a doping effect, such that the attapulgite can be converted into porous silica, the number of acid active sites on the outer surface of the ZSM-5 molecule sieve is reduced, isomerization reactions of p-xylene on the outer surface of the molecule sieve is effectively reduced, and selectivity on p-xylene is further increased.

Description

technical field [0001] The invention relates to a preparation method of a porous silicon dioxide / ZSM-5 molecular sieve catalyst, belonging to the technical field of shape-selective catalysis. Background technique [0002] P-xylene is an important raw material for the synthesis of polyester fibers, pesticides, medicines and dyes. At present, the industry mainly uses mixed xylene isomerization, toluene and C 9 Aromatics disproportionation and selective disproportionation of toluene to produce p-xylene. The p-xylene obtained by the first two methods is only the thermodynamic equilibrium concentration among the three isomers of xylene, which is about 24%. The subsequent separation of p-xylene is quite harsh and consumes a lot of energy; In the process, two moles of toluene are needed to generate one mole of p-xylene, and the utilization rate of toluene is low. [0003] Alkylation of toluene and methanol to directly synthesize high-concentration p-xylene has been a research ho...

Claims

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Application Information

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IPC IPC(8): B01J29/40C07C15/08C07C2/88
CPCY02P20/52
Inventor 张宇
Owner 广州光义化工科技发展有限公司
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