Method of producing low carbon olefin through direct conversion of catalyst and synthesis gas

Abstract

The invention belongs to the field of directly producing low carbon olefin by using synthesis gas, and particularly relates to a method of producing low carbon olefin through the direct conversion ofa catalyst and synthesis gas. According to the method, the synthesis gas is used as a reaction raw material and suffers conversion reaction on a stationary bed or a moving bed; the catalyst is a compound catalyst A+B; a catalyst A and a catalyst B are compounded together in a mechanical mixing manner; an active component of the catalyst A is an active metallic oxide; the catalyst is an oxide supported molecular sieve which is one or two of CHA and AEI; the carrying capacity of the molecular sieve is 4%wt-45%wt; and the weight ratio of the active component in the catalyst A and the catalyst B is in the range of 0.1-20 times, and preferentially is 0.3-5. The reaction process has very high low carbon olefin selectivity; the low carbon olefin comprises ethylene, propylene and butane, the selectivity sum of which can reach 50-90%; meanwhile, the selectivity of byproduct methane is lower than 15%; and the method has very good application prospect.

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 ...

AI Technical Summary

Problems solved by technology

In 2012, the team of Professor de Jong of Utrecht University in the Netherlands used SiC, Fe catalysts supported by inert carriers such as carbon nanofibers and Fe catalysts modified by Na, S and other additives, and made good progress and obtained 61% low-carbon olefin selectivity. However, as the conversion rate increases, the selectivity decreases

The catalyst in the above report uses iron and cobalt-based catalysts as active components, the reaction follows the chain growth reaction mechanism on the metal surface, and the selectivity of the product low-carbon olefins is low

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