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Preparation method of 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 high cost, low catalytic efficiency, and cumbersome preparation of shape-selective catalysts, and achieve low cost, simple preparation methods, and high shape-selective performance. Effect

Active Publication Date: 2017-04-26
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 absolute ethanol, and after mixing evenly, add microporous molecular sieve ZSM-5 to the above solution, and stir evenly, wherein the mass ratio of tetrabutyl titanate to absolute ethanol is 1:1 The mass ratio of tetrabutyl titanate to microporous molecular sieve is 1:10, stir evenly, and let stand at room temperature; put the material obtained in the above steps into a two-necked flask, and pass water vapor at room temperature for 2h, and then transfer to In the muffle furnace, the temperature was raised to 550°C at a rate of 10°C / min in an air atmosphere, and 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 absolute ethanol, and after mixing evenly, add microporous molecular sieve ZSM-5 to the above solution, and stir evenly, wherein the mass ratio of tetrabutyl titanate to absolute ethanol is 1:2 The mass ratio of tetrabutyl titanate to microporous molecular sieve is 1:15, stir evenly, and let stand at room temperature; put the material obtained in the above steps into a two-necked flask, and pass water vapor at room temperature for 2h, and then transfer to In the muffle furnace, the temperature was raised to 550°C at a rate of 10°C / min in an air atmosphere, and 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, Recorded as CAT2.

Embodiment 3

[0019] Add tetrabutyl titanate to absolute ethanol, and after mixing evenly, add microporous molecular sieve ZSM-5 to the above solution, and stir evenly, wherein the mass ratio of tetrabutyl titanate to absolute ethanol is 1:1.5 The mass ratio of tetrabutyl titanate to microporous molecular sieve is 1:32, stir evenly, and let stand at room temperature; put the material obtained in the above steps into a two-necked flask, and pass water vapor at room temperature for 4h, and then transfer to In the muffle furnace, the temperature was raised to 550°C at a rate of 10°C / min in an air atmosphere, and 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, Recorded as CAT3.

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Abstract

The invention relates to a preparation method of a titanium oxide modified microporous molecular sieve shape-selective catalyst. According to the method, a microporous molecular sieve ZSM-5 or MCM-22 is taken as a matrix, tetrabutyl titanate is taken as a precursor, absolute ethyl alcohol is taken as a solvent, titanium oxide is supported to the outer surface of the microporous molecular sieve through equivalent-volume impregnation and water-vapor treatment, and titanium oxide in the catalyst accounts for 3%-10% of the total mass of the catalyst. The shape-selective catalyst obtained with the method has good shape-selective catalysis performance on a process of synthesizing p-xylene through alkylation of toluene 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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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J29/70C07C15/08C07C2/88
CPCB01J29/405B01J29/7088B01J2229/18B01J2229/36C07C2/88C07C2529/40C07C2529/70C07C15/08Y02P20/52
Inventor 柳娜文琳智吴浩薛冰
Owner CHANGZHOU UNIV
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