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A kind of preparation method of graphene oxide modified microporous molecular sieve shape selective catalyst

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: 2020-10-23
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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  • A kind of preparation method of graphene oxide modified microporous molecular sieve shape selective catalyst
  • A kind of preparation method of graphene oxide modified microporous molecular sieve shape selective catalyst
  • A kind of preparation method of graphene oxide modified microporous molecular sieve shape selective catalyst

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Experimental program
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Effect test

Embodiment 1

[0031] Add 2g of microporous molecular sieve MCM-22 to 40mL of deionized water, and ultrasonically disperse for 30min at room temperature; add 0.2g of graphene oxide to 10mL of deionized water, and disperse by ultrasonic for 30min at room temperature; drop the graphene oxide dispersion under ultrasonic conditions Add to the dispersion of the microporous molecular sieve, and then sonicate for 30 minutes after the addition is complete; filter the mixture obtained in the above process, and dry the filter cake at 80°C for 12 hours, then increase the temperature to 120°C and keep it at this temperature for 2 hours, Then it is cooled down to room temperature to obtain the desired graphene oxide modified microporous molecular sieve shape-selective catalyst, which is recorded as Cat1.

Embodiment 2

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

Embodiment 3

[0035] Add 2g of microporous molecular sieve MCM-22 to 100mL of deionized water, and ultrasonically disperse for 30min at room temperature; add 0.3g of graphene oxide to 30mL of deionized water, and then ultrasonically disperse for 30min at room temperature; drop the graphene oxide dispersion under ultrasonic conditions Add to the dispersion of the microporous molecular sieve, and then sonicate for 30 minutes after the addition is complete; filter the mixture obtained in the above process, and dry the filter cake at 80°C for 12 hours, then increase the temperature to 120°C and keep it at this temperature for 2 hours, Then the temperature is lowered to room temperature, and the desired graphene oxide modified microporous molecular sieve shape-selective catalyst is obtained, which is recorded 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 method for preparing a modified microporous molecular sieve shape-selective catalyst used in the process of toluene disproportionation to synthesize p-xylene. Background technique [0002] Paraxylene is an important chemical raw material, and its traditional synthesis method is mainly obtained through the process of toluene disproportionation. The catalysts commonly used in the process of toluene disproportionation are microporous molecular sieves such as ZSM-5 or MCM-22. The alkylation reaction can simultaneously obtain the three xylene isomers of ortho, meta, and para. This is mainly due to the formation of Para-xylene easily undergoes isomerization reaction on the outer surface of the catalyst to generate o-xylene and meta-xylene. Therefore, in order to improve the selectivity of p-xylene in the disproportionation process, that is, to improve the shape-sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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