Catalyst for producing propylene by catalytic pyrolysis and preparation method thereof

Abstract

The invention discloses a catalyst for producing propylene by catalytic pyrolysis and a preparation method thereof. Calculated as the total weight of the catalyst, the catalyst comprises 20 to 40 weight percent of element-modified molecular sieve and 60 to 80 weight percent of heat-resistant inorganic oxide, wherein the content of a modified element is between 1 and 10 weight percent calculated as the total weight of the molecular sieve, the average grain diameter of crystal grains of the molecular sieve is between 10 and 100nm, and the modified element is one or a mixture of more of family IB metals and / or phosphorus. The catalyst is used for reactions that low carbon olefin, particularly the propylene is produced by C6-C12 olefins through catalytic pyrolysis, and has higher conversion rate of the C6-C12 olefins and yield of the propylene.

Description

technical field

[0001] The present invention relates to a catalyst for the catalytic conversion of olefins and a preparation method thereof, more specifically to a catalyst made of C 6 ~C 12 A catalyst for producing light olefins, especially propylene, by catalytic cracking of olefins and a preparation method thereof. Background technique

[0002] Propylene is an important petrochemical basic raw material, mainly used in the production of polypropylene, acrylonitrile, propylene oxide, isopropanol, cumene and acrylic acid. With the rapid development of the national economy, the demand for propylene continues to increase, but the growth of propylene production capacity is limited, and the traditional method of increasing propylene production cannot meet the market demand.

[0003] Hydrocarbon steam cracking process and catalytic cracking process are the two main sources of propylene. The steam cracking unit is mainly based on light raw materials. The output of propylene is ...

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