Methods for converting CO2 into methane

By preparing nickel metal catalysts on uranium oxide (UO2+x) supports and combining them with induction heating technology, the problems of catalyst deactivation and carbon deposition at high temperatures were solved, and efficient CO2 to methane conversion at low temperatures was achieved with high yield and selectivity.

CN117396274BActive Publication Date: 2026-07-10ORANO CHEM ENRICHISSEMENT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ORANO CHEM ENRICHISSEMENT
Filing Date
2022-04-21
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing catalysts suffer from deactivation and carbon deposition at high temperatures in CO2 methanation reactions, making it difficult to maintain high activity and selectivity at low temperatures. Furthermore, precious metal catalysts are expensive.

Method used

A nickel metal catalyst contained on a uranium oxide (UO2+x) support was prepared by impregnation, calcination and reduction steps. It was used for the conversion of CO2 to methane at 160℃ to 550℃ and 0.1 MPa to 1 MPa, and combined with induction heating technology to control the catalyst bed temperature.

Benefits of technology

The catalyst achieved efficient conversion of CO2 to methane at temperatures below 350°C, exhibiting a CH4 yield of over 60% and selectivity close to 100%, while reducing the reaction temperature and improving catalyst stability.

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Abstract

The invention relates to a process for converting CO2 into methane, wherein hydrogen is contacted with a gaseous feed comprising CO2 in at least one methanation reactor comprising a catalyst bed at a catalyst bed temperature of 160°C to 550°C at a pressure of 0.1 MPa to 1 MPa, wherein the gas hourly space velocity is 10 m 3 / kg / hour to 50 m 3 / kg / hour, and wherein the H2 / CO2 molar ratio is 1 to 8, and wherein the catalyst comprises Ni metal deposited on a substrate made of uranium oxide having the formula UO 2+x , wherein x is 0.01 to 0.6, and wherein the mass content of nickel is 5% to 40% of nickel metal relative to the total mass of the catalyst.
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