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Preparation method for boric-acid-modified microporous molecular sieve shape-selective catalyst

A microporous molecular sieve and catalyst technology is applied in the preparation field of boric acid-modified microporous molecular sieve shape-selective catalyst, which can solve the problems of complicated preparation operation and high cost of the shape-selective catalyst, save labor and energy consumption, reduce influence, and improve catalysis active effect

Active Publication Date: 2015-03-11
CHANGZHOU UNIV
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  • 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 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Fully grind 4g of microporous molecular sieve ZSM-5 and 0.8g of boric acid in an agate mortar, then transfer to a muffle furnace, heat up to 550°C at a rate of 10°C / min in an air atmosphere, and then cool down to room temperature. Boric acid modified microporous molecular sieve shape-selective catalyst. Denote it as Cat A.

Embodiment 2

[0015] Fully grind 4g microporous molecular sieve ZSM-5 and 0.2g boric acid in an agate mortar, then transfer to a muffle furnace, heat up to 550°C at a rate of 10°C / min in an air atmosphere, and then cool down to room temperature. Boric acid modified microporous molecular sieve shape-selective catalyst. Recorded as Cat B.

Embodiment 3

[0017] Fully grind 4g of microporous molecular sieve MCM-22 and 0.6g of boric acid in an agate mortar, then transfer to a muffle furnace, heat up to 550°C at a rate of 10°C / min in an air atmosphere, and then cool down to room temperature. Boric acid modified microporous molecular sieve shape-selective catalyst. Recorded as Cat C.

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Abstract

The invention relates to a preparation method for a boric-acid-modified microporous molecular sieve shape-selective catalyst. The method comprises: taking a microporous molecular sieve ZSM-5 or MCM-22 as a matrix, taking boric acid as a boron oxide precursor, and loading the outer surface of the microporous molecular sieve with boron oxide through mechanical grinding and a solid phase chemical reaction process, wherein the content of boron oxide in the catalyst is 3%-12% by mass of the total catalyst. The obtained catalyst has extremely good shape-selective catalytic performance in a process of synthesizing 1,4-diethylbenzene from ethylenzene through disproportionation, and the preparation method for 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 method for preparing a boric acid-modified microporous molecular sieve shape-selective catalyst used in the process of disproportionating ethylbenzene to synthesize p-diethylbenzene. 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...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/70C07C15/02C07C6/12
CPCY02P20/52
Inventor 柳娜华松杰刘恒瑞薛冰李永昕刘平
Owner CHANGZHOU UNIV
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