CONVERSION OF CO2 IN THE PRESENCE OF A NICKEL AND COPPER CATALYST

A bimetallic nickel-copper catalyst with controlled composition and size distribution addresses the selectivity and stability issues of RWGS, enhancing CO2 conversion to CO with reduced by-products and environmental footprint.

FR3154018B1Active Publication Date: 2025-09-26IFP ENERGIES NOUVELLES
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Patent Information

Application Number
FR2023011185
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-10-17
Publication Date
2025-09-26
Estimated Expiration
2043-10-17

AI Technical Summary

Technical Problem

Current catalysts for the reverse water gas shift (RWGS) reaction suffer from low selectivity and stability, particularly due to strong CO adsorption on nickel nanoparticles leading to methane production and deactivation at high temperatures, necessitating the development of active, selective, and stable catalysts for efficient CO2 conversion to carbon monoxide.

Method used

A bimetallic catalyst comprising nickel and copper nanoparticles with a specific Ni/Cu ratio and narrow size distribution, prepared via a colloidal route, is used for the RWGS reaction, operating at controlled temperatures and pressures to enhance CO selectivity and stability.

Benefits of technology

The bimetallic catalyst significantly improves the selectivity of CO2 hydrogenation to CO, maintaining catalyst activity and reducing by-product formation, while minimizing environmental impact through internal hydrogen production and reduced water consumption.

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Abstract

The present invention relates to a process for the hydrogenation of CO2 by reverse water gas reaction (RWGS) by bringing a feedstock of a gas mixture comprising CO2 and hydrogen into contact with a catalyst comprising an active phase based on nickel and copper and a silica or silica-alumina support, said active phase being in the form of bimetallic nanoparticles corresponding to the formula NixCuy with x = 1 and y between 1 and 3, said nanoparticles having a number average diameter of less than 10 nm with a standard deviation relative to the size of said nanoparticles of less than or equal to 50% of said number average diameter.
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