Method for pre-treating low-carbon alkane dehydrogenation catalyst

Abstract

The invention discloses a method for pre-treating a low-carbon alkane dehydrogenation catalyst. The method comprises the following steps: 1) mass water absorption rate of a finished product Cr-series dehydrogenation catalyst is determined, water absorption is carried out on the catalyst for saturation; 2) semi-dry dehydration of the Cr-series dehydrogenation catalyst after water absorption for saturation is carried out to obtain the catalyst processed by semi-drying; and 3) the catalyst obtained in the step 2) is impregnated by an estersil-containing organic solvent, then is heated and dried through a program, then is calcinated to obtain the low-carbon alkane dehydrogenation catalyst. The processed catalyst has high mechanical strength, and has good conversion rate and selectivity used for a dehydrogenation reaction, the preparation method is simple, and the method is adapted to industrial application.

Description

technical field [0001] The invention relates to a pretreatment method of a low-carbon alkane dehydrogenation catalyst. Background technique [0002] The development of shale gas in North America has led to a sharp decline in natural gas prices relative to crude oil prices, while the production of large condensate liquids (NGLs) in shale gas has also increased rapidly. Shale gas condensate is rich in low-carbon alkanes such as ethane, propane, and butane. Ethane can be used as a cracking raw material to produce ethylene. Therefore, FCC technology alone cannot meet the rapidly growing demand for propylene. Dehydrogenation of low-carbon alkanes in natural gas (conventional natural gas, shale gas, coalbed methane, combustible ice, etc.) to produce low-carbon olefins is an effective way to solve this problem. Moreover, with the increasing scarcity of petroleum resources, the production of propylene has changed from relying solely on petroleum as a raw material to diversifying th...

AI Technical Summary

Problems solved by technology

However, the molecular sieve catalyst is a microporous material, and the pore size is smaller than the molecular diameter of the silicon ester, so the silicon ester molecules cannot enter the pores of the molecular sieve, and can only adjust the acidity of the outer surface of the molecular sieve.

Alumina is a mesoporous material with a large pore size, and silicon ester molecules can enter the pores of alumina, and the SiO remaining in the pores after calcination 2 It not only changes the internal structure of the pores, but also affects the loaded main catalytic components, and even blocks the secondary pores, so that the active components in the secondary pores cannot contact the reactants to carry out the catalytic reaction.

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