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Catalyst for arene shape selective reaction and preparation method thereof

A technology for catalysts and aromatics, applied in the field of catalysts and their preparation, can solve the problems of low catalyst strength and low catalyst shape selectivity, and achieve the effects of simple preparation methods, low porosity and high strength

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved in the present invention is that the existing catalysts used for the shape-selective reaction of aromatic hydrocarbons have low catalyst strength when using silica sol binder, and low catalyst shape-selectivity when using alumina binder. Provide a new catalyst for aromatic hydrocarbon shape-selective reaction and its preparation method

Method used

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  • Catalyst for arene shape selective reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 10g of alumina with 5g of methicone, grind for 20 minutes, and let stand for 2 hours. Then it is mixed evenly with 90 g of hydrogen-type ZSM-5 zeolite with a silicon-aluminum ratio of 60, shaped, dried, and calcined at 500° C. for 4 hours to obtain a catalyst precursor.

[0015] Put the catalyst precursor into 120g of methyl silicone oil solution, carry out the chemical liquid phase deposition reaction at 25°C for 3 hours, filter and dry it, and bake it in an air atmosphere at 500°C for 4 hours to obtain a catalyst body.

[0016] Then, the above-mentioned steps of the modified catalytic body were continued to be modified by chemical liquid phase deposition for 3 times. The mechanical strength of the obtained catalyst was 110N / particle. The catalyst was evaluated at 435°C and a pressure of 2.0mpa, using pure toluene as a raw material, and taking samples for analysis after 2 hours of reaction. It is calculated that the conversion rate of toluene in the toluene shape...

Embodiment 2

[0018] 20 g of alumina was mixed with 15 g of tetraethyl orthosilicate, milled for 60 minutes, and allowed to stand for 4 hours. Then it is mixed evenly with 80 g of hydrogen-type ZSM-5 zeolite with a silicon-aluminum ratio of 80, shaped, dried, and calcined at 450° C. for 3 hours to obtain a catalyst precursor.

[0019] Put the catalyst precursor into 140g of phenylmethyl silicone oil solution, carry out the chemical liquid phase deposition reaction at 25°C for 3 hours, filter and dry it, and roast it under the air atmosphere of 450°C for 3 hours to obtain the primary modified catalyst .

[0020] Then the catalyst body was modified by chemical liquid phase deposition for 2 times according to the above steps. The mechanical strength of the obtained catalyst was 105 N / particle. The catalyst was evaluated at 400°C and a pressure of 2.0mpa. Pure toluene and methanol were used as raw materials, and the molar ratio of toluene to methanol was 2:1. After 2 hours of reaction, sample...

Embodiment 3

[0022] Mix 30g of alumina with 30g of tetraethyl orthosilicate, grind for 45 minutes, and let stand for 4 hours. Then it is mixed evenly with 70 g of hydrogen-type ZSM-5 zeolite with a silicon-to-aluminum ratio of 75, shaped, dried, and calcined at 450° C. for 3 hours to obtain a catalyst precursor.

[0023] Put the catalyst precursor into 135g tetraethyl orthosilicate solution, carry out the chemical liquid phase deposition reaction at 25°C for 3 hours, filter, dry, and roast at 550°C for 3 hours in an air atmosphere to obtain the catalyst body.

[0024] Then the catalyst body was modified by chemical liquid phase deposition for one time according to the above steps. The mechanical strength of the obtained catalyst was 118N / particle. The catalyst was evaluated at 450°C and a pressure of 2.0mpa, using pure ethylbenzene as a raw material, and taking samples for analysis after 2 hours of reaction. It is calculated that the ethylbenzene conversion rate in the ethylbenzene selec...

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Abstract

The invention relates to a catalyst for arene shape selective reaction and a preparation method thereof, and is mainly used for solving the technical problems that in the prior art, the catalyst strength is low when silica sol is used as a bonder and the shape selectivity of the catalyst is low when an aluminum oxide bonder is used. The catalyst for arene shape selective reaction provided by the invention comprises 10-90 parts of ZSM-5 zeolite with SiO2 / Al2O3 molar ratio of 10-500, 10-90 parts of processed aluminum oxide carrier and 0.1-20 parts of silicon oxide coating by weight. The technical scheme better solves the problems, and the catalyst can be used to industrial production of arene shape selective reaction such as preparation of paraxylene by selective disproportionation of methylbenzene, preparation of p-diethylbenzene by selective disproportionation of ethylbenzene, preparation of paraxylene by shape selective methylation of methylbenzene and preparation of p-diethylbenzene by shape selective methylation of ethylbenzene.

Description

technical field [0001] The invention relates to a catalyst used for the shape-selective reaction of aromatic hydrocarbons and a preparation method thereof. Background technique [0002] The shape-selective reaction of aromatic hydrocarbons mainly includes the shape-selective disproportionation reaction of aromatic hydrocarbons, the shape-selective alkylation reaction of aromatic hydrocarbons, the shape-selective isomerization reaction of aromatic hydrocarbons, etc. These reactions are generally carried out in the pores of molecular sieves with special structures, and the requirements for the channel structure of molecular sieves are very high. ZSM-5 molecular sieve has a pore system composed of 10-membered rings, high specific surface area and unique surface acidity, allowing the para-isomers of aromatic products to diffuse rapidly, so it shows good shape-selective catalytic performance and has become a conventional aromatic hydrocarbon shape-selective reaction. The main co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C15/08C07C15/04C07C6/12
CPCY02P20/52
Inventor 陈秉李为孔德金祁晓岚
Owner CHINA PETROLEUM & CHEM CORP
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