Carbon-containing iron-based catalyst for hydrogenation of CO2 to prepare hydrocarbons, and preparation method thereof

Abstract

The invention provides a carbon-containing iron-based catalyst for hydrogenation of CO2 to prepare hydrocarbons. The catalyst is characterized in that a bimetallic ZIF is used as a precursor, an ironsource is introduced, nanoparticles adopting pyr5C2 and Fe3ZnC0.5 as iron species are prepared by pyrolysis in an inert atmosphere, and the nanoparticles are embedded in a porous carbon matrix to formthe carbon-containing iron-based catalyst. The invention also provides a preparation method of the carbon-containing iron-based catalyst for hydrogenation of CO2 to prepare hydrocarbons. The porous carbon-containing iron-based catalyst is designed and prepared to solve the problems of poor catalysis effect and poor stability of iron-based catalysts free from alkali metals in the prior art. A porous carbon material with good metal species distribution is prepared by pyrolysis in the inert atmosphere with the ZIF as the precursor, the metal particles in the ZIFs-derived material are separated by carbon layers, and have good dispersibility, and the porosity of the carbon material is conducive to the adsorption of CO2.

Description

technical field [0001] The invention relates to the technical field of catalysis, more specifically, to a high-activity and high-stability CO 2 A carbon-containing iron-based catalyst for hydrogenation of hydrocarbons and a preparation method thereof. Background technique [0002] The abundant and cheap CO 2 As a carbon source, with renewable energy H 2 The production of chemicals through reactions can reduce CO in the atmosphere to a certain extent 2 concentration, while reducing the pressure on fossil fuel consumption. CO 2 Hydrogenation to high value-added hydrocarbons is a way with market potential and application prospects. Iron-based catalysts are most effective at catalyzing CO 2 Catalysts for hydrogenation of hydrocarbons, so iron-based catalysts are widely used in CO 2 In the hydrogenation hydrocarbon reaction. [0003] At present, the addition of alkali metal promoters is required on iron-based catalysts to significantly increase the low-carbon olefins and ...

AI Technical Summary

Problems solved by technology

and due to CO 2 It is a very stable molecule, relatively difficult to activate, and the carbon-carbon coupling energy barrier is high, so CO 2 The hydrogenation reaction needs to be carried out under high temperature and high pressure conditions, and a large amount of water will be generated during the reaction

The metal particles on the catalyst are easy to sinter during the reaction, and the alkali metal will be lost during the reaction, which has a great impact on the stability of the catalyst

At present, it is still a challenge to prepare iron-based catalysts with high activity and high stability.

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