Preparation method of composite carrier catalyst and low-carbon chain olefin

Abstract

The invention relates to a preparation method of a composite carrier catalyst and low-carbon chain olefin. The preparation method of the composite carrier catalyst comprises the following steps of crystallizing an initial gel mixture, introducing the mixed gas of acetylene and hydrogen in the crystallizing process, repeatedly charging and discharging gas, and then punching, so as to obtain a composite carrier with an SAPO-34 molecular sieve carrier; loading active components onto the composite carrier, so as to obtain the composite carrier catalyst. The preparation method of the low-carbon chain olefin comprises the following steps of using hydrogen to reduce the catalyst, mixing the acetylene and the hydrogen, and reacting with the catalyst, so as to obtain the low-carbon chain olefin. The preparation method has the advantages that by adopting the special crystallizing method, the prepared composite carrier catalyst has double active centers, the hydrogenation reaction and polymerization reaction can be realized, and the one-step preparation effect of the low-carbon chain olefin can be realized; the preparation process is simple, the catalyzing efficiency is high, and the cost islow; by adjusting the proportional ratio of the hydrogen and the acetylene, the distribution of the low-carbon chain olefin product can be adjusted, and the selectivity is high in the preparation process of the low-carbon chain olefin.

Description

technical field [0001] The invention relates to the technical field of catalyst and olefin preparation, and more specifically, to a composite carrier catalyst and a method for preparing low-carbon olefins. Background technique [0002] Low-carbon olefins generally refer to olefins with 4 or less carbon atoms, such as ethylene, propylene, and butene. Low-carbon olefins are the most basic raw materials for petrochemical production, and can be used to produce organic compounds such as polyethylene, polypropylene, acrylonitrile, ethylene oxide or ethylene glycol. There are two main methods for preparing low-carbon olefins: one is the petroleum route; the other is the non-petroleum route. my country's oil resources are relatively scarce, and coal and natural gas resources are relatively rich. Based on our energy structure, the development of coal chemical and natural gas chemical technology is in line with our national conditions. At present, the feasible technical routes of lo...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the preparation of low-carbon alkenes based on acetylene polymerization and hydrogenation, especially the preparation of ethylene and butadiene.

[0003] In the prior art, butadiene is synthesized using a silica gel-supported palladium-lead bimetallic catalyst, and the coke produced by the reaction is likely to cause blockage of the catalyst pores and deactivation of the catalyst; and the required reduction temperature is relatively high, about 400 ° C, and the catalyst Contains lead element, subsequent processing is difficult

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