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Preparation method for titanium oxide modified microporous molecular sieve shape-selective catalyst

A technology of microporous molecular sieves and catalysts, which is applied in the field of preparation of shape-selective catalysts, can solve the problems of cumbersome preparation of shape-selective catalysts, high cost, and low catalytic efficiency, and achieve improved shape-selective performance, low cost, and high catalyst activity. Effect

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

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a simple synthesis method, low cost, and high shape-selective performance for the preparation of a shape-selective catalyst in the process of synthesizing p-xylene by alkylation of toluene. Preparation method of shape-selective catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add tetrabutyl titanate to dry toluene and stir evenly, wherein the mass ratio of tetrabutyl titanate to toluene is 1:10; then add microporous molecular sieve ZSM-5 to the above solution, tetrabutyl titanate and The mass ratio of microporous molecular sieves is 1:10, stir evenly, and stand at room temperature under airtight conditions; the material obtained in the above steps is evaporated to dryness in a water bath, then put into an oven for drying, and then transferred to a muffle furnace, and placed in the air In the atmosphere, the temperature was raised to 550° C. at a rate of 10° C. / min, kept at this temperature for 4 hours, and then lowered to room temperature to obtain the desired titanium oxide modified microporous molecular sieve shape-selective catalyst. Denote it as Cat1.

Embodiment 2

[0017] Add tetrabutyl titanate to dry toluene and stir evenly, wherein the mass ratio of tetrabutyl titanate to toluene is 1:10; then add microporous molecular sieve ZSM-5 to the above solution, tetrabutyl titanate and The mass ratio of microporous molecular sieves is 1:5, stir evenly, and stand at room temperature under airtight conditions; evaporate the material obtained in the above steps to dryness in a water bath, then put it into an oven for drying, and then transfer it to a muffle furnace, and place it in the air In the atmosphere, the temperature was raised to 550° C. at a rate of 10° C. / min, kept at this temperature for 4 hours, and then lowered to room temperature to obtain the desired titanium oxide modified microporous molecular sieve shape-selective catalyst. Denote it as Cat1.

Embodiment 3

[0019] Add tetrabutyl titanate to dry toluene and stir evenly, wherein the mass ratio of tetrabutyl titanate to toluene is 1:10; then add microporous molecular sieve ZSM-5 to the above solution, tetrabutyl titanate and The mass ratio of microporous molecular sieves is 3:10, stir evenly, and stand at room temperature under airtight conditions; evaporate the material obtained in the above steps to dryness in a water bath, then put it into an oven for drying, and then transfer it to a muffle furnace, in the air In the atmosphere, the temperature was raised to 550° C. at a rate of 10° C. / min, kept at this temperature for 4 hours, and then lowered to room temperature to obtain the desired titanium oxide modified microporous molecular sieve shape-selective catalyst. Denote it as Cat1.

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PUM

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Abstract

The invention relates to a preparation method for a titanium oxide modified microporous molecular sieve shape-selective catalyst. According to the method, titanium oxide is loaded to the outer surface of a microporous molecular sieve through a dipping method by taking the microporous molecular sieve ZSM-5 or MCM-22 as a matrix, taking tetrabutyl titanate as a titanium oxide precursor, and taking methylbenzene as a solvent; and the content of titanium oxide in the catalyst is 5-20% of the total weight of the catalyst. The obtained shape-selective catalyst has very good shape-selective catalysis performance for a process of synthesizing p-xylene by alkylation of methylbenzene and dimethyl carbonate.

Description

technical field [0001] The invention relates to the field of preparation of shape-selective catalysts, in particular to a preparation method of a titanium oxide-modified microporous molecular sieve shape-selective catalyst 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 main...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/70C07C2/86C07C15/08
CPCB01J29/405B01J29/7088C07C2/86C07C15/08Y02P20/52
Inventor 薛冰吴浩王少卿柳娜李永昕
Owner CHANGZHOU UNIV
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