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Preparation method and application of carbon nitride modified microporous molecular sieve shape selection catalyst

A microporous molecular sieve and carbon nitride technology, which is applied to molecular sieve catalysts, including molecular sieve catalysts, carbon compound catalysts, etc., can solve the problems of high cost, low catalytic efficiency, cumbersome preparation and operation of shape-selective catalysts, and achieve high selectivity. Effect

Inactive Publication Date: 2019-04-05
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a simple preparation method and low cost for the preparation of a shape-selective catalyst in the process of synthesizing p-xylene from toluene. Preparation method of shape-selective catalyst with high shape-selective performance in process

Method used

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  • Preparation method and application of carbon nitride modified microporous molecular sieve shape selection catalyst
  • Preparation method and application of carbon nitride modified microporous molecular sieve shape selection catalyst
  • Preparation method and application of carbon nitride modified microporous molecular sieve shape selection catalyst

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Effect test

Embodiment 1

[0029] Add 2g of microporous molecular sieve MCM-22 into 40mL of deionized water, and disperse by ultrasonic at room temperature for 30 minutes; gradually add carbon nitride powder to the above mixture, the amount of each addition is 0.02g, and add 5 times continuously, after each addition Ultrasonic treatment for 30 minutes; then filter the resulting mixture, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, and then lower it to room temperature to obtain the desired carbon nitride modification Microporous molecular sieve shape-selective catalyst, denoted as Cat1.

Embodiment 2

[0031] Add 2g of microporous molecular sieve MCM-22 into 100mL of deionized water, and disperse by ultrasonic at room temperature for 30 minutes; gradually add carbon nitride powder to the above mixture, each addition is 0.02g, continuously add 10 times, after each addition Ultrasonic treatment for 30 minutes; then filter the resulting mixture, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, and then lower it to room temperature to obtain the desired carbon nitride modification Microporous molecular sieve shape-selective catalyst, denoted as Cat2.

Embodiment 3

[0033] Add 2g of microporous molecular sieve MCM-22 into 60mL of deionized water, and disperse by ultrasonic at room temperature for 30 minutes; gradually add carbon nitride powder to the above mixture, each addition is 0.02g, continuously add 7 times, after each addition Ultrasonic treatment for 30 minutes; then filter the resulting mixture, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, and then lower it to room temperature to obtain the desired carbon nitride modification Microporous molecular sieve shape-selective catalyst, denoted as Cat3.

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Abstract

The invention relates to a preparation method and an application of a carbon nitride modified microporous molecular sieve shape selection catalyst. The method includes taking microporous molecular sieves MCM-22 and ZSM-5 as basal body; and dispersing carbon nitride on the outer surfaces of the microporous molecular sieves through an ultrasonic dispersion method. The shape selection catalyst has good shape-selective catalytic performance in the process of synthesizing paraxylene by disproportionation of toluene.

Description

technical field [0001] The invention relates to the field of preparation of shape-selective catalysts, in particular to a preparation method of a modified microporous molecular sieve shape-selective catalyst used in the process of synthesizing p-xylene by disproportionation of toluene. Background technique [0002] P-xylene is an important chemical raw material, and its traditional synthesis method is mainly obtained through the disproportionation process of toluene. The commonly used catalysts in the disproportionation process of toluene are microporous molecular sieves such as ZSM-5 or MCM-22. The alkylation reaction can simultaneously obtain three isomers of o-, m-, and p-xylene, which is mainly due to the formation of P-xylene is easily isomerized on the outer surface of the catalyst to generate ortho-xylene and m-xylene. Therefore, in order to improve the selectivity of p-xylene in the disproportionation process, that is, to improve the shape-selective performance of t...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/70C07C6/12C07C15/08
CPCB01J29/40B01J29/7038B01J2229/38C07C6/123C07C2529/40C07C2529/70C07C15/08Y02P20/52
Inventor 柳娜王军徐瑞诚薛冰管啸天许杰
Owner CHANGZHOU UNIV
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