Catalyst facilitating direct preparation of light olefins from syngas as well as preparation and application of catalyst

Abstract

The invention discloses a preparation method of a catalyst facilitating highly selective synthesis of light olefins from syngas. A compound adopting a spherical or ellipsoidal structure is taken as a carrier to be loaded with iron oxide and added with auxiliaries and is used for Fischer-Tropsch reaction for the syngas. The catalyst has very high catalytic activity on one hand and can effectively reduce alkane generated through secondary reaction hydrogenation of light olefins, and the selectivity of light olefins is improved. The preparation method of the catalyst is simple, and the catalyst has very good application prospects.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas conversion, and relates to an iron-based catalyst for directly producing low-carbon olefins from synthesis gas through a Fischer-Tropsch synthesis route, as well as its preparation and application. Background technique [0002] Low-carbon olefins including ethylene, propylene and butene are important chemical raw materials, which mainly come from the cracking of naphtha. With the reduction of crude oil resources and the increasingly prominent environmental problems, at the same time, the large-scale development of shale gas has made it challenging to obtain olefins from petroleum routes and has become unsustainable. Therefore, more and more attention has been paid to the production of low-carbon olefins by non-petroleum routes. As an alternative technical route for the production of low-carbon olefins such as ethylene and propylene, the direct production of low-carbon olefins from syngas is...

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Problems solved by technology

For example, Chinese patent CN104056627A has reported that a relatively inert iron source is a precursor loaded on an inert carrier to prepare a Fischer-Tropsch catalyst with high selectivity to generate low-carbon olefins, which has a higher selectivity for olefins, but given in the examples The CO conversion rate is obviously too low

Chinese patents CN104226327A and CN103773409A reported that silica and alumina were used as catalysts for supporting iron in the Fischer-Tropsch synthesis of synthesis gas. It was reported that high CO conversion and olefin selectivity were obtained, but the composition of the catalyst was too complicated , there are more than 3 kinds of necessary additives, which makes the preparation process very complicated and difficult to repeat

In the existing literature and patents, there is no information on the use of iron-loaded catalysts with spherical supports and additives for Fischer-Tropsch synthesis of syngas

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