Loaded catalyst and method of directly converting synthesized gas to prepare low carbon olefin

Abstract

The invention belongs to direct preparation of low carbon olefin by synthesized gas and in particular relates to a loaded catalyst and a method of directly converting synthesized gas to prepare low carbon olefin. By taking the synthesized gas as a reaction raw material, a conversion reaction is carried out on a fixed bed or a mobile bed. The catalyst is a compound catalyst which is prepared by compounding a component I and a component II in a mechanical mixing mode. The active component of the component A is a metal oxide, the component II is a loaded molecular sieve, a carrier is one or two of porous holes Al2O3, SiO2, TiO2, ZrO2, CeO2, MgO and Ga2O3, the molecular sieve is one or two of CHA and AEI structures, and the loading capacity of the molecular sieve is 40-45wt%. The weight ratioof the active component in the component I and the compound II is within a range of 0.1-20 times. The reaction process has very high low carbon olefin selectivity. The low carbon olefin comprises ethylene, propylene and butene, the sum of selectivity of which can reach 50-90%. Meanwhile, the selectivity of a byproduct methane is lower than 7%, and meanwhile, the method has a very good applicationprospect.

Description

technical field [0001] The invention belongs to the preparation of low-carbon olefins by synthesis gas, and in particular relates to a method for preparing low-carbon olefins by direct conversion of a supported catalyst and synthesis gas. 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 en...

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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