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A kind of preparation method of P2O5 modified microporous molecular sieve shape-selective catalyst

A microporous molecular sieve and catalyst technology, which is applied in the field of preparation of P2O5 modified microporous molecular sieve shape-selective catalyst, can solve the problems of cumbersome preparation operation, high cost and low shape-selective performance of the shape-selective catalyst, and achieves improved shape-selective performance, The effect of low cost and high shape selection performance

Inactive Publication Date: 2015-08-12
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 simple synthesis method, low cost and high shape-selective performance for the preparation of the shape-selective catalyst in the process of synthesizing p-xylene by disproportionation of toluene. Preparation method of shape-selective catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 10mL of absolute ethanol with 1.13g of triethyl phosphate and 4.0g of microporous molecular sieve MCM-22, stir well until the mixture is uniform, and let stand at room temperature for 12h; ℃ oven for 6 hours, then transferred to a muffle furnace, heated to 600°C at a rate of 10°C / min in an air atmosphere, and kept at this temperature for 4 hours, and then cooled to room temperature to obtain 10%P 2 o 5 Modified microporous molecular sieve shape-selective catalyst. Denote it as Cat1.

Embodiment 2

[0017] Mix 10 mL of absolute ethanol with 0.11 g of triethyl phosphate and 4.0 g of microporous molecular sieve MCM-22, stir well until the mixture is uniform, and let stand at room temperature for 12 hours; ℃ oven for 6 hours, then transferred to a muffle furnace, heated to 600 ℃ at a rate of 10 ℃ / min in an air atmosphere, and kept at this temperature for 4 hours, and then cooled to room temperature to obtain 1%P 2 o 5 Modified microporous molecular sieve shape-selective catalyst. Denote it as Cat2.

Embodiment 3

[0019] Mix 10mL of absolute ethanol with 1.81g of triethyl phosphate and 4.0g of microporous molecular sieve MCM-22, stir well until the mixture is uniform, and let stand at room temperature for 12h; ℃ oven for 6 hours, then transferred to a muffle furnace, heated to 600 ℃ at a rate of 10 ℃ / min in an air atmosphere, and kept at this temperature for 4 hours, and then lowered to room temperature to obtain 15%P 2 o 5 Modified microporous molecular sieve shape-selective catalyst. Recorded as Cat3.

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Abstract

The invention relates to a preparation method of a P2O5 modified micro-porous molecular sieve shape-selective catalyst. The method adopts micro-porous molecular sieve ZSM-5 or MCM-22 as a matrix and phosphate as a precursor, P2O5 is loaded on the external surface of the micro-porous molecular sieve through a dipping and programmed heating roasting process, and the content of P2O5 in the shape-selective catalyst is 1-15% of the total mass of the catalyst. The shape-selective catalyst obtained in the invention has a very good shape-selective catalysis effect on a toluene disproportionation process, 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 P 2 o 5 A preparation method of a modified microporous molecular sieve shape-selective catalyst. Background technique [0002] The process of toluene disproportionation to p-xylene is a typical shape-selective catalytic process. Microporous molecular sieves such as ZSM-5 and MCM-22 are commonly used shape-selective catalysts for the disproportionation 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 obtain p-xylene with high selectivity, the microporous molecular sieve must be modified to reduce the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J29/40C07C15/08C07C6/00
CPCY02P20/52
Inventor 薛冰黄芹李永昕柳娜许杰
Owner CHANGZHOU UNIV
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