A catalyst and a method for preparing light olefins by direct carbon monoxide hydrogenation conversion

Abstract

The invention belongs to direct preparation of light olefins by carbon monoxide hydrogenation, and especially relates to a catalyst and a method for preparing light olefins by direct carbon monoxide hydrogenation conversion. Synthetic gas is adopted as a reaction raw material of the method, and is subjected to a conversion reaction in a fixed bed or a moving bed. The catalyst adopted by the methodis compounded by an A component and a B component, the A component being a metal oxide, and the B component being a molecular sieve, and the metal oxide and the molecular sieve are physically mixed and play a role of catalysis. The weight ratio range of the A component to the B component is 0.1-20; a product yield and selectivity of a reaction process are high; the selectivity of light olefins can reach 65-85%; the selectivity of propylene can reach 45-66%; and the selectivity of by-product methane is extremely low (less than 5%), and therefore, the catalyst and the method have good application prospects.

Description

technical field [0001] The invention belongs to carbon monoxide hydrogenation to prepare low-carbon olefins, in particular to a catalyst and a method for directly converting carbon monoxide hydrogenation to prepare 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 encoun...

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Problems solved by technology

In the patent they applied for (201610600945.6), they can significantly increase the selectivity of C3-C4 olefins by controlling the proportion of skeleton elements and the amount of medium-strong acid, but the selectivity of propylene itself can only reach a maximum of 40%.

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