Catalyst and method for direct conversion of synthesis gas for preparation of low carbon olefins

Abstract

The invention belongs to direct preparation of low carbon olefins from synthesis gas, and particularly relates to a catalyst and a method for direct conversion of the synthesis gas for preparation ofthe low carbon olefins. According to the method, the synthesis gas is adopted as a reaction raw material, a conversion reaction is carried out on a fixed bed or a moving bed, and the catalyst is a A+Bcomposite catalyst which is compounded by mixing a catalyst A and a catalyst B mechanically, wherein the active ingredient of the catalyst A is active metal oxide, and the catalyst B is one or two ormore selected from a molecular sieve of a CHA and AEI structure or a metal-modified CHA and/or AEI molecular sieve; a spacing between the geometric center of particles of the active metal oxide of the catalyst A and the geometric center of particles of the catalyst B is 5[mu]m-40 mm, a spacing between axial centers of particles is preferably 100 [mu]m-5 mm, more preferably 200 [mu]m-4 mm, and theweight ratio of the active ingredient in the catalyst A to the catalyst B is in a range of 0.1-20, preferably 0.3-5.

Description

technical field [0001] The invention belongs to the preparation of low-carbon olefins by synthesis gas, and in particular relates to a catalyst and a method for directly converting synthesis gas to produce low-carbon olefins. Background technique [0002] Low-carbon olefins refer to olefins with carbon atoms less than or equal to 4. 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 supply of low-carbon olefins has been in short supply for a long time. At present, the production of low-carbon olefins mainly adopts the petrochemical route of cracking light hydrocarbons (ethane, naphtha, light diesel oil). Due to the increasing shortage of global oil resources and the long-term high price of crude oil, the development of low-carbon olefins industry only relies on oil The tubular cracking furnace process with light hydrocarbons as raw materials will encounter more ...

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Problems solved by technology

The catalyst in the above report uses metallic iron or iron carbide as the active component, the reaction follows the chain growth reaction

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