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

A microporous molecular sieve and catalyst technology, which is applied in the field of preparation of shape-selective catalysts, can solve the problems of complicated preparation of shape-selective catalysts, low catalytic efficiency and high cost, so as to improve shape-selective performance and catalytic activity, simplify preparation process and cost low cost effect

Active Publication Date: 2021-01-26
CHANGZHOU UNIV
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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 alkylation of toluene. Preparation method of oxide-modified microporous molecular sieve shape-selective catalyst

Method used

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  • A kind of preparation method of oxide modified microporous molecular sieve shape selective catalyst
  • A kind of preparation method of oxide modified microporous molecular sieve shape selective catalyst

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Effect test

Embodiment 1

[0024] Dissolve 0.2g of magnesium nitrate in 10mL of deionized water, then add 2g of microporous molecular sieve MCM-22 without template removal into the above solution, stir evenly, and let stand at room temperature; °C for 12 hours, then transferred to a muffle furnace, heated 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 modified oxide. The shape-selective catalyst of the microporous molecular sieve is denoted as Cat1.

Embodiment 2

[0026] Dissolve 0.07g of magnesium nitrate in deionized water, then add 2g of microporous molecular sieve MCM-22 without removing the template into the above solution, stir evenly, and let stand at room temperature; After drying for 12 hours, transfer to a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min in an air atmosphere, and keep it at this temperature for 4 hours, and then lower it to room temperature to obtain the desired oxide modification. Microporous molecular sieve shape-selective catalyst, denoted as Cat2.

Embodiment 3

[0028] Dissolve 0.1g of magnesium nitrate in deionized water, then add 2g of microporous molecular sieve MCM-22 without template removal to the above solution, stir evenly, and let stand at room temperature; After drying for 12 hours, transfer to a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min in an air atmosphere, and keep it at this temperature for 4 hours, and then lower it to room temperature to obtain the desired oxide modification. Microporous molecular sieve shape-selective catalyst, denoted as Cat3.

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Abstract

The invention relates to a preparation method of an oxide-modified microporous molecular sieve shape-selective catalyst. In the method, the original powder of the microporous molecular sieve from which the template agent has been removed is used as a carrier, and metal nitrate is used as a precursor, and the metal oxide is supported by an impregnation method on the outer surface of the microporous molecular sieve. The shape-selective catalyst obtained in the invention has good shape-selective catalytic performance in the process of synthesizing p-xylene by 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 an 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 mainly due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J29/40B01J29/46B01J29/72
CPCB01J29/40B01J29/405B01J29/46B01J29/7038B01J29/7276
Inventor 薛冰谢德华柳娜徐瑞诚管啸天许杰
Owner CHANGZHOU UNIV
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