Method for preparing CO through CO2 catalytic hydrogenation with cobalt-based catalyst

Abstract

The invention belongs to the technical field of carbon dioxide catalytic conversion, particularly relates to a cobalt-based catalyst, and further relates to a method for preparing CO through CO2 catalytic hydrogenation by adopting a cobalt-based catalyst. The cobalt-based catalyst is composed of an SBA-15 matrix and a cobalt active center loaded on the SBA-15 matrix, the cobalt active center is obtained by reducing a cobalt oxide deposition layer loaded on the SBA-15 matrix, and the cobalt oxide deposition layer is formed in an atomic layer deposition mode. The cobalt-based catalyst provided by the invention has good catalytic activity and stability. When the cobalt-based catalyst is used for catalyzing CO2 hydrogenation to prepare CO, the cobalt-based catalyst has good selectivity and stability.

Description

technical field [0001] The invention belongs to the technical field of catalytic conversion of carbon dioxide, in particular to a cobalt-based catalyst, and also to a CO 2 Application of catalytic hydrogenation to CO. Background technique [0002] will CO 2 Conversion to other chemicals, especially CO 2 Hydroconversion of CO 2 An important way of resource utilization and emission reduction can not only alleviate the environmental pressure caused by its emission, but also provide various chemicals with economic value such as carbon monoxide, methanol, formic acid, dimethyl ether, ethanol, olefins, etc. However, CO 2 Strong inertness, difficult to activate. in CO 2 Catalyst selection is critical in the conversion process. [0003] CO 2 Catalytic hydrogenation to carbon monoxide (CO) is a reasonable route for its utilization. CO is the main component of synthesis gas. It is not only an important raw material for coal chemical industry, but also participates in the prod...

AI Technical Summary

Problems solved by technology

However, the product is usually a mixture of CO, methanol and methane, the selectivity of CO is low and the CO 2 less active

Limited by thermodynamics, CO 2 Hydrogenation synthesis of CO usually requires a higher reaction temperature, and noble metal catalysts are often used as the main catalyst or auxiliary agent, and the CO selectivity and stability of the catalyst are low

[0004] Co-based catalysts are commonly used hydrogenation catalysts in industry and exhibit excellent performance in Fischer-Tropsch synthesis, but in CO 2 The main product of hydrogenation is CH 4 And C2, C3 and other low-carbon alkanes have great limitations in direct utilization and secondary utilization

In addition, Co also has problems such as phase transition, migration and loss during the high-temperature reaction process, and it is difficult to control the selectivity of CO.

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