Multilevel porous molecular sieve catalyst as well as preparation method and application thereof

Abstract

The invention relates to a multilevel porous molecular sieve catalyst as well as a preparation method and application thereof. The preparation method of the multilevel porous molecular sieve catalyst comprises the following steps: adding an organic template agent ethanol solution into an aluminum source, a silicon source and a silane ethanol solution to form gel, performing air drying on the gel to obtain dry gel, adding water and tetrapropylammonium hydroxide into the dry gel to obtain a mixture, putting the mixture into a high-pressure kettle, crystallizing the mixture for 3 days at the temperature of 180 DEG C to obtain a multilevel porous ZSM-5 molecular sieve, uniformly mixing the multilevel porous ZSM-5 molecular sieve with gamma-Al2O3, adding a dilute nitric acid solution, then performing mixed kneading, performing strip extruding for forming, drying and roasting in air so as to obtain a carrier; and soaking the carrier by utilizing a magnesium acetate solution, drying and roasting the carrier to obtain a phenylcarbinol alkylation catalyst. When the prepared catalyst is applied to the phenylcarbinol alkylation reaction, the catalyst has the advantages that coke and carbon are not easily generated, the activity is high, and the product selectivity is high. Compared with other catalysts in the prior art, for the catalyst disclosed by the invention, the activity and the reaction stability are high, and the service life is longer.

Description

technical field [0001] The invention relates to a multi-stage pore molecular sieve catalyst for benzene-methanol alkylation, as well as its preparation and application. Background technique [0002] Benzene is mainly derived from catalytic reforming, isomerization of aromatics, and by-products of coal tar and ethylene production processes. According to reports, 150,000 tons of benzene will be generated for every 800,000 tons of ethylene produced, and the growth of ethylene in my country will be over 2 million t / a, which will inevitably lead to a large surplus of benzene. Methanol, as a cheap and easy-to-obtain excellent reagent, has been extensively researched and applied in aspects such as esterification and etherification. However, as one of the important products of coal chemical industry, with the rapid development of coal chemical industry, the market The production of methanol will increase rapidly, and there will be a surplus situation. As one of the most important b...

AI Technical Summary

Problems solved by technology

The catalyst has high selectivity and stability of toluene and xylene, and can solve the problems of low space velocity, low conversion rate, poor product selectivity and easy coking of current catalysts, so as to effectively and comprehensively utilize benzene and methanol resources to produce various values Higher chemical production, less impact on the environment

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