Recent advances in thermal catalytic CO2 methanation on hydrotalcite-derived catalysts

Abstract

Carbon dioxide (CO2) methanation has increasingly attracted more attention due to its potential in carbon emission reduction and the utilization of surplus renewable electricity. The main issue with CO2 methanation is the mismatch between the thermodynamics and kinetics of the process, as it is thermodynamically favourable while being restricted by kinetics. Therefore, the research and development of catalysts for CO2 methanation that exhibit high activity and selectivity at low temperatures is the key to solving this issue. Hydrotalcite materials are widely used as adsorbents and heterogeneous catalysis precursors due to their simple preparation and high catalytic performance. These materials exhibit good CO2 adsorption and conversion performance when used in CO2 methanation, and have thus been heavily researched. Herein, a critical review begins with details on CO2 capture and hydrogen sources, followed by an introduction on the development status of hydrotalcite-derived catalyst systems and their catalytic performance towards the CO2 methanation reaction. Then, the reaction technology and feasibility of the application of these catalyst materials are also discussed. With the maturity of power-to-gas technology, CO2 methanation is thus expected to become an important development approach for CO2 resource utilization in the future.