Fused iron catalyst for producing light olefins from syngas and preparation method and application thereof

Abstract

The invention provides fused iron catalyst for producing light olefins from syngas and a preparation method and application thereof. The fused iron catalyst includes iron oxide and cocatalyst and the proportion of the components is as follows by weight percent: 0.1-5 alumina, 0.1-6 potassium oxide, 0.1-4.0 calcium oxide and 0.01-8.5 other oxides, and balance iron oxide. The fused iron catalyst has the beneficial effects that (1) the materials of the fused iron catalyst are cheap and easy to get, the preparation process is simple, and the fused iron catalyst is low in cost and is suitable for industrial production; (2) the fused iron catalyst is of high mechanical strength as well as good pressure resistance and abrasion resistance and is suitable for a fixed bed, a fluidized bed and a slurry bed reactor; and (3) the fused iron catalyst has high Fischer-Tropsch synthesis activity and selectivity, the conversion per pass can be more than 95%, the selectivity of the methane is less than 10% and the content of the light olefins can reach 80-90%.

Description

(1) Technical field [0001] The invention relates to a molten iron catalyst for producing low-carbon olefins from syngas and its preparation and application. (2) Background technology [0002] Fischer-Tropsch synthesis is a polymerization process in which carbonaceous raw materials (such as coal, natural gas, biomass, etc.) are gasified into synthesis gas, which is then converted into gasoline, diesel, naphtha and other hydrocarbon products through catalysts. [0003] Low-carbon olefins, such as ethylene, propylene and butene, are used as raw materials for the production of many chemicals, and play a pivotal role in the modern petroleum and chemical industries. With the development of the economy and the progress of society, the demand is increasing day by day, and the application fields growing. Olefins are usually produced by cracking petroleum. Due to limited petroleum resources and high prices, the cost of producing olefins from petroleum resources continues to increase...

AI Technical Summary

Problems solved by technology

But with precious metal C S As a co-catalyst, expensive

[0005] Chinese patent ZL 03109585.2, Fe / activated carbon catalyst with activated carbon as carrier, manganese, copper, zinc, silicon, potassium, etc. %, the content of hydrocarbons in the gas phase product can reach 69.5%, and the selectivity of ethylene, propylene and butene in hydrocarbons can reach more than 68%, but the preparation process of the catalyst is complicated, the production cost is high, and the mechanical strength Low