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A kind of preparation method of melem modified microporous molecular sieve shape-selective catalyst

A technology of microporous molecular sieve and melem, which is applied in the field of preparation of shape-selective catalysts, can solve the problems of high cost, low catalytic efficiency, complicated preparation and operation of shape-selective catalysts and the like

Active Publication Date: 2021-01-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a kind of selective catalyst with simple synthesis method, low cost and high shape-selective performance aiming at the problems such as cumbersome preparation operation, high cost and low catalytic efficiency in the process of synthesizing p-xylene by disproportionation of toluene. Form catalyst preparation method

Method used

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  • A kind of preparation method of melem modified microporous molecular sieve shape-selective catalyst
  • A kind of preparation method of melem modified microporous molecular sieve shape-selective catalyst
  • A kind of preparation method of melem modified microporous molecular sieve shape-selective catalyst

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Effect test

Embodiment 1

[0027] Add 2g of microporous molecular sieve MCM-22 into 40mL of deionized water, and disperse by ultrasonic at room temperature for 30min; add melem powder gradually to the above mixture, add 0.02g each time, add 5 times continuously, and ultrasonicate for 30min after each addition ; 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 melem modified microporous molecular sieve Shape-selective catalysts are denoted as Cat1.

Embodiment 2

[0029] Add 2g of microporous molecular sieve MCM-22 into 100mL of deionized water, and disperse by ultrasonic at room temperature for 30min; add melem powder gradually to the above mixture, add 0.02g each time, add 10 times continuously, and ultrasonicate for 30min after each addition ; 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 melem modified microporous molecular sieve Shape-selective catalysts are denoted as Cat2.

Embodiment 3

[0031] Add 2g of microporous molecular sieve MCM-22 into 60mL of deionized water, and disperse by ultrasonic at room temperature for 30min; add melem powder gradually to the above mixture, add 0.02g each time, add 7 times continuously, and ultrasonicate for 30min after each addition ; 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 melem modified microporous molecular sieve Shape-selective catalysts are denoted as Cat3.

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Abstract

The invention relates to a preparation method of a melem modified micro-porous molecular sieve shape-selective catalyst. According to the method, a micro-porous molecular sieve MCM-22 and a ZSM-5 serve as substrates, and melem is dispersed on the outer surface of the micro-porous molecular sieve by a liquid-phase ultrasonic dispersion method. The prepared shape-selective catalyst has excellent shape-selective catalytic performance in p-xylene synthesis process by toluene disproportionation.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02B01J31/26C07C6/12C07C15/08
CPCB01J31/0244B01J31/26B01J2231/4205C07C6/12C07C2531/02C07C2531/26C07C15/08Y02P20/52
Inventor 薛冰刘佳宝柳娜徐瑞诚管啸天许杰
Owner CHANGZHOU UNIV
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