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Preparation method of graphene oxide modified shape-selective catalyst with microporous molecular sieves

A microporous molecular sieve and graphene modification technology, which is applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high cost, low catalytic efficiency, cumbersome preparation and operation of shape-selective catalysts, etc.

Active 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 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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  • Preparation method of graphene oxide modified shape-selective catalyst with microporous molecular sieves
  • Preparation method of graphene oxide modified shape-selective catalyst with microporous molecular sieves
  • Preparation method of graphene oxide modified shape-selective catalyst with microporous molecular sieves

Examples

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Effect test

Embodiment 1

[0031] Add 2g of microporous molecular sieve MCM-22 into 40mL deionized water, and disperse ultrasonically at room temperature for 30min; add 0.2g graphene oxide into 10mL deionized water, and disperse ultrasonically at room temperature for 30min; Add it to the dispersion of microporous molecular sieves, and then ultrasonically treat it for 30 minutes after the addition is complete; filter the mixture obtained in the above process, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, Then the temperature is lowered to room temperature, and the desired graphene oxide modified microporous molecular sieve shape-selective catalyst is obtained, which is denoted as Cat1.

Embodiment 2

[0033] Add 2g of microporous molecular sieve MCM-22 into 60mL of deionized water, and disperse by ultrasonic at room temperature for 30min; add 0.2g of graphene oxide into 14mL of deionized water, and disperse by ultrasonic at room temperature for 30min; Add it to the dispersion of microporous molecular sieves, and then ultrasonically treat it for 30 minutes after the addition is complete; filter the mixture obtained in the above process, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, Then the temperature is lowered to room temperature, and the desired graphene oxide modified microporous molecular sieve shape-selective catalyst is obtained, which is denoted as Cat2.

Embodiment 3

[0035] Add 2g of microporous molecular sieve MCM-22 into 100mL of deionized water, and disperse by ultrasonic at room temperature for 30min; add 0.3g of graphene oxide into 30mL of deionized water, and disperse by ultrasonic at room temperature for 30min; Add it to the dispersion of microporous molecular sieves, and then ultrasonically treat it for 30 minutes after the addition is complete; filter the mixture obtained in the above process, dry the filter cake at 80°C for 12h, then raise the temperature to 120°C, and keep it at this temperature for 2h, Then the temperature is lowered to room temperature, and the desired graphene oxide modified microporous molecular sieve shape-selective catalyst is obtained, which is denoted as Cat3.

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Abstract

The invention relates to a preparation method of a graphene oxide modified shape-selective catalyst with microporous molecular sieves. According to the method, the microporous molecular sieves MCM-22and ZSM-5 serve as matrixes, and graphene oxide is dispersed in the outer surfaces of the microporous molecular sieves according to a liquid-phase ultrasonic dispersion method. The obtained shape-selective catalyst has good shape-selective catalytic performance for the process of synthesizing p-toluene 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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IPC IPC(8): B01J29/70B01J29/40C07C6/12C07C15/08
CPCB01J29/40B01J29/7038C07C6/123C07C15/08Y02P20/52
Inventor 柳娜王军徐瑞诚薛冰管啸天许杰
Owner CHANGZHOU UNIV
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