Fixed-bed low-carbon olefin catalyst, preparation method and use thereof

Abstract

The invention relates to a catalyst for preparing low carbon olefin by a fixed bed, a preparation method as well as use thereof, which mainly solves the problem that the CO conversion ratio is low and low carbon olefin selectivity is low in synthesis gas to low carbon reaction in the prior art and the catalyst is poor in intensity and thermal stability under a using condition. By adopting the technical scheme that the catalyst provided by the invention comprises the following components in parts by weight: a) 30-80 parts of iron element and oxides thereof; b) 10-40 parts of at least one element selected from manganese and chromium or oxides thereof; c) 10-40 parts of at least one element selected from copper and zinc or oxides thereof; d) 0.9-20 parts of at least one element selected from potassium and cesium or oxides thereof; e) 0.9-20 parts of at least one element selected from cerium and neodymium or oxides thereof; and f) 0.5-10 parts of an antimony element or oxides thereof, the problem is better solved, and the catalyst can be used for industrial production of Fischer-Tropsch synthesis to prepare low carbon olefin.

Description

Technical field [0001] The invention relates to a fixed bed low-carbon olefin catalyst, a preparation method and its use. Background technique [0002] Lower olefins refer to olefins with 4 carbon atoms or less. Low-carbon olefins represented by ethylene and propylene are very important basic organic chemical raw materials. With the rapid growth of my country's economy, the low-carbon olefin market has been in short supply for a long time. At present, the production of low-carbon olefins mainly uses the petrochemical route of light hydrocarbons (ethane, naphtha, light diesel) cracking. Due to the increasing shortage of global petroleum resources and the long-term high crude oil prices, the development of the low-carbon olefin industry depends solely on petroleum Tubular cracking furnace processes using light hydrocarbons as raw materials will encounter increasingly greater raw material problems, and low-carbon olefin production processes and raw materials must be diversified. T...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the problem of low CO conversion rate and low selectivity of low-carbon olefins in the product in the Fischer-Tropsch synthesis process of low-carbon olefins in the prior art, and the problem of poor strength and thermal stability of the catalyst under the conditions of use. Provide a new fixed-bed Fischer-Tropsch synthesis catalyst for producing low-carbon olefins, which has the advantages of high CO conversion rate and high selectivity of low-carbon olefins in the product when the catalyst is used for Fischer-Tropsch synthesis of low-carbon olefins

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