A preparation method of tungsten oxide modified microporous molecular sieve shape-selective catalyst

A microporous molecular sieve and catalyst technology, which is applied in the field of preparation of tungsten oxide modified microporous molecular sieve shape-selective catalysts, can solve the problems of cumbersome preparation and high cost of shape-selective catalysts, achieve improved shape-selective performance, low cost, and a preparation method simple effect

Active Publication Date: 2018-04-27
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a preparation method of a shape-selective catalyst with simple synthesis method, low cost and high shape-selective performance in view of the complicated preparation operation and high cost of the shape-selective catalyst in the disproportionation process of ethylbenzene

Method used

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  • A preparation method of tungsten oxide modified microporous molecular sieve shape-selective catalyst

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Experimental program
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Effect test

Embodiment 1

[0018] Add 0.136g of ammonium tungstate to 2.7mL of deionized water, and stir evenly; then mix 4.0g of microporous molecular sieve MCM-22, stir well until uniformly mixed, and let stand at room temperature for 12h; evaporate the obtained substance to dryness in a water bath, Then put it in an oven at 120°C for 6 hours, then transfer it to a muffle furnace, raise the temperature to 600°C at a rate of 10°C / min in an air atmosphere, and then lower it to room temperature to obtain a shape-selective tungsten oxide modified microporous molecular sieve. catalyst. Denote it as Cat A.

Embodiment 2

[0020] Add 0.776g of ammonium tungstate to 15.5mL of deionized water and stir evenly; then mix 4.0g of microporous molecular sieve MCM-22, stir well until uniformly mixed, and let stand at room temperature for 12h; evaporate the obtained substance to dryness in a water bath, Then put it in an oven at 120°C for 6 hours, then transfer it to a muffle furnace, raise the temperature to 600°C at a rate of 10°C / min in an air atmosphere, and then lower it to room temperature to obtain a shape-selective tungsten oxide modified microporous molecular sieve. catalyst. Recorded as Cat B.

Embodiment 3

[0022] Add 0.435g of ammonium tungstate to 8.7mL of deionized water, and stir evenly; then mix 4.0g of microporous molecular sieve ZSM-5, stir well until uniformly mixed, and let stand at room temperature for 12h; evaporate the obtained substance to dryness in a water bath, Then put it in an oven at 120°C for 6 hours, then transfer it to a muffle furnace, raise the temperature to 600°C at a rate of 10°C / min in an air atmosphere, and then lower it to room temperature to obtain a shape-selective tungsten oxide modified microporous molecular sieve. catalyst. Recorded as Cat C.

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Abstract

The invention relates to a preparation method of a tungsten oxide-modified microporous molecular sieve shape-selective catalyst. The method uses microporous molecular sieve ZSM-5 or MCM-22 as a carrier, and uses ammonium tungstate as a precursor of tungsten oxide to oxidize the tungsten oxide by an impregnation method. Tungsten is supported on the outer surface of the microporous molecular sieve, and the content of tungsten oxide in the catalyst is 3% to 15% of the total mass of the catalyst. The catalyst obtained by the invention has good shape-selective catalytic performance for the disproportionation process of ethylbenzene, and the preparation method of the catalyst is simple.

Description

technical field [0001] The invention relates to the field of preparation of solid inorganic composite materials, in particular to a preparation method of a tungsten oxide modified microporous molecular sieve shape-selective catalyst used in the disproportionation process of ethylbenzene. Background technique [0002] The disproportionation of ethylbenzene to p-diethylbenzene is a typical shape-selective catalytic process. Microporous molecular sieves ZSM-5 and MCM-22 are commonly used shape-selective catalysts in the disproportionation process of ethylbenzene. However, since there are a large number of acid sites on the outer surface of these microporous molecular sieves, the p-diethylbenzene generated in the pores of the molecular sieve during the disproportionation of ethylbenzene can easily undergo isomerization reaction on the acidic sites on the outer surface of the molecular sieve, thereby reducing the selectivity for para-products. In order to obtain p-diethylbenzen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01J29/48C07C6/12C07C15/02
Inventor 柳娜文琳智刘恒瑞薛冰李永昕许杰
Owner CHANGZHOU UNIV
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