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Preparation method of boron modification microporous molecular sieve shape-selective catalyst

The technology of microporous molecular sieve and catalyst is applied in the field of preparation of type-selective catalyst, can solve the problems of high cost, complicated preparation operation of shape-selective catalyst, difficult control and the like, and achieves the effects of low cost, improved shape-selective performance and simple preparation method

Inactive Publication Date: 2017-04-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a simple synthesis method, low cost, and selectivity for the preparation of a shape-selective catalyst in the process of synthesizing p-xylene by alkylation of toluene and dimethyl carbonate. Preparation method of shape-selective catalyst with high shape performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add boric acid to ethanol, wherein the mass ratio of boric acid to ethanol is 1:10, stir until completely dissolved; then add microporous molecular sieve ZSM-5 to the above solution, the mass ratio of microporous molecular sieve to boric acid is 1:100, Stir evenly and let stand at room temperature; evaporate the material obtained in the above steps to dryness in a water bath, then put it in an oven to dry, then transfer it to a muffle furnace, and heat it up to 550°C at a rate of 10°C / min in an air atmosphere. And kept at this temperature for 3h, then lowered to room temperature, the desired boron-modified microporous molecular sieve ZSM-5 shape-selective catalyst was obtained, denoted as Cat1.

Embodiment 2

[0018] Add boric acid to n-propanol, wherein the mass ratio of boric acid to n-propanol is 1:10, stir until completely dissolved; then add microporous molecular sieve ZSM-5 to the above solution, the mass ratio of microporous molecular sieve to boric acid is 1:50, stir evenly, and stand at room temperature; evaporate the material obtained in the above steps to dryness in a water bath, then put it in an oven to dry, then transfer it to a muffle furnace, and heat up at a rate of 10°C / min in an air atmosphere to 550° C., and kept at this temperature for 3 hours, and then lowered to room temperature to obtain the desired boron-modified microporous molecular sieve ZSM-5 shape-selective catalyst, denoted as Cat2.

Embodiment 3

[0020] Add boric acid to n-propanol, wherein the mass ratio of boric acid to n-propanol is 1:10, stir until completely dissolved; then add microporous molecular sieve ZSM-5 to the above solution, the mass ratio of microporous molecular sieve to boric acid is 1:30, stir evenly, and stand at room temperature; evaporate the material obtained in the above steps to dryness in a water bath, then put it in an oven to dry, then transfer it to a muffle furnace, and heat up at a rate of 10°C / min in an air atmosphere to 550° C., and kept at this temperature for 3 hours, and then lowered to room temperature to obtain the desired boron-modified microporous molecular sieve ZSM-5 shape-selective catalyst, denoted as Cat3.

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Abstract

The invention relates to a preparation method of a boron modification microporous molecular sieve shape-selective catalyst. The method comprises the steps that a microporous molecular sieve ZSM-5 or MCM-22 is adopted as a matrix, boric acid is adopted as a precursor, organic borate is obtained in an in-situ mode through a reaction of the borate and low-carbon fatty alcohols so that a boron oxide is loaded on the outer surface of a microporous molecular sieve, the mass content of boron in the catalyst is 1-3% of the total mass of the catalyst. The obtained shape-selective catalyst has the good shape-selective catalytic performance in the xylene process through synthesis of methylbenzene and methyl-carbonate alkylate.

Description

technical field [0001] The invention relates to the field of preparation of shape-selective catalysts, in particular to a method for preparing boron-modified microporous molecular sieve shape-selective catalysts used in the process of alkylating toluene and dimethyl carbonate to synthesize p-xylene. 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, but because the disproportionation process requires a strong acidic catalyst and a high reaction temperature, the catalyst deactivates quickly. In recent years, the synthesis of p-xylene by direct alkylation of toluene has become a research hotspot. [0003] The commonly used catalysts in the alkylation process of toluene are microporous molecular sieves such as ZSM-5 or MCM-22. The alkylation reaction can simultaneously obtain three isomers of ortho, meta, and para-xylene, which is mainly due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/70C07C2/88C07C15/08
CPCY02P20/52B01J29/40B01J29/7038B01J2229/183C07C2/88C07C15/08
Inventor 薛冰吴浩王少卿柳娜李永昕
Owner CHANGZHOU UNIV
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