A kind of preparation method that is used for the catalyst of toluene disproportionation process

A toluene disproportionation and catalyst technology, which is applied in the field of preparation of barium oxide modified microporous molecular sieve shape-selective catalysts, can solve the problems of energy consumption, time-consuming, cumbersome operation, etc., and achieve good shape-selective effect, simplified preparation procedures, and good catalytic activity Effect

Inactive Publication Date: 2017-04-19
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of shape-selective catalysts by this method requires twice impregnation, drying, and roasting of microporous molecular sieves, which is cumbersome and time-consuming.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Add 0.34g of barium nitrate and 3g of microporous molecular sieve ZSM-5 into an agate mortar and grind until uniform, then put the resulting material in a muffle furnace, raise the temperature to 600°C in an air atmosphere, and then lower it to room temperature, that is to obtain the desired catalyst. The mass ratio of the barium oxide in the obtained catalyst to the microporous molecular sieve is 1:15. The catalyst is denoted as CAT-1

Embodiment 2

[0013] Add 0.51 barium nitrate and 3 g microporous molecular sieve ZSM-5 into an agate mortar and grind until uniform, then put the resulting material into a muffle furnace, raise the temperature to 600 °C in an air atmosphere, and then cool it down to room temperature to obtain required catalyst. The mass ratio of the barium oxide in the obtained catalyst to the microporous molecular sieve is 1:10. The catalyst is denoted as CAT-2

Embodiment 3

[0015] Add 1.7g of barium nitrate and 3g of microporous molecular sieve ZSM-5 into an agate mortar and grind until uniform, then put the resulting material into a muffle furnace, raise the temperature to 600°C in an air atmosphere, and then lower it to room temperature, that is to obtain the desired catalyst. The mass ratio of the barium oxide in the obtained catalyst to the microporous molecular sieve is 1:3. The catalyst is denoted as CAT-3

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PUM

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Abstract

The invention relates to a preparation method of a catalyst for a toluene disproportionation process. The method comprises the following step of grinding and roasting by taking a microporous molecular sieve ZSM-5 or MCM-22 as a carrier and taking barium nitrate, barium carbonate or barium acetate as a barium oxide precursor. By the method, the acid site of the outer surface of the microporous molecular sieve is covered without affecting the acid property in pores of the microporous molecular sieve. The catalyst obtains a relatively good shape selection effect when being used for toluene disproportionation for synthesizing the paraxylene. The preparation method of the catalyst is simple and energy-saving, and shape selection effect of the catalyst is good.

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 barium oxide modified microporous molecular sieve shape-selective catalyst used in the process of synthesizing p-xylene by disproportionation of toluene. Background technique [0002] The synthesis of p-xylene by disproportionation of toluene is a typical shape-selective catalytic process. Common microporous molecular sieves such as ZSM-5 and MCM-22 are commonly used shape-selective catalysts in the disproportionation process of toluene. However, since there are a large number of acid sites on the outer surface of these microporous molecular sieves, the p-xylene generated in the pores of the molecular sieve during the disproportionation of toluene can easily undergo isomerization reaction on the acidic sites on the outer surface of the molecular sieve, thereby reducing the p-xylene. product selectivity. In order to obta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/70
Inventor 薛冰柳娜李永昕许杰
Owner CHANGZHOU UNIV
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