Developing and applying integrated CO2 capture-hydrogen conversion technology is a key strategy for coping with climate change and achieving carbon peaking and carbon neutrality.Dual functional materials with adsorption and catalytic components are the core tech-nology.In this paper,the main work of the principal national and international research institutions were summarized systematically on synthetic methods,adsorption properties,reaction kinetics,promotion mechanisms,deactivation mechanisms,and applications of dual functional materials for CO2 capture using in-situ methanation and in-situ reverse water gas shift technologies.An overview of the princi-pal national and international research institutions'latest progress on CO2 capture-hydrogenation conversion was provided.DFMs are com-posites with both catalytic and adsorption components.In the selection of catalytic components,noble metal catalysts are highly active but expensive,while Ni-based catalysts are less costly but less reducible and prone to deactivation in oxygen-containing atmospheres.In the selection of adsorption components,metal oxides(e.g.,CaO,MgO)and alkali metal carbonates(e.g.,Na2CO3,K2CO3)are the most promising adsorption components due to their high theoretical adsorption capacity,especially MgO and CaO,although they face the chal-lenges of poor actual adsorption capacity and poor cyclic stability.Current studies have focused on enhancing the actual adsorption capacity of MgO by doping with alkali metal molten salts,and improving the cycling performance and sintering resistance of CaO adsorbents by do-ping with metal additives(e.g.,La,Co,Fe,etc.).Kinetic studies have shown that the reaction rate is highly dependent on the H2 partial pressure and that the average CH4 yield can be increased by adjusting the timing of adsorption and catalysis.ICCU technology shows prom-ising applications,especially in key areas such as iron and steel,energy,and chemicals.However,a comprehensive assessment of the en-vironmental impact of the technology,especially from a life cycle assessment(LCA)perspective,is essential for a full understanding of the environmental sustainability of ICCU technology and its contribution to carbon reduction.In the future,through continuous research and technological innovation to solve the existing challenges,ICCU technology is expected to achieve significant results in industrialized applications and make important contributions to global carbon emission reduction.
integrated CO2 capture-conversion technologydual functional materialsmethanationreverse water gas shiftreaction kinetics
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