Progress in dense ceramic catalytic membrane reactors for CO₂ conversion

The direct high-temperature splitting of CO 2 into CO and O 2 is a viable conversion method (2CO 2 →2CO+O 2 ) for reusing CO 2 . Nevertheless, this reaction is constrained by thermodynamic equilibrium, rendering it challenging to attain CO 2 splitting in conventional fixed-bed reactors. Membrane technology enables the selective removal of products through membrane reactors, thereby circumventing the limitations of thermodynamic equilibrium, and enhancing the conversion rate of CO 2 raw materials and the yield of target products. The performance of a perovskite-type mixed conducting oxygen permeable membrane – a crucial component of mixed conducting dense membrane materials – is of great significance for determining its application potential in areas like oxygen production and high-temperature catalytic reactions. The advancement of catalytic membrane reactors (CMRs) relies on the judicious selection of perovskite membrane materials that exhibit optimal oxygen permeability and stability, and the prudent choice of reaction systems and catalysts within the CMRs. This review presents a summary of the recent developments in perovskite-type mixed conducting membrane materials and perovskite CMRs with a focus on CO 2 splitting. The advancement of innovative membrane reactor technology and the application of perovskite materials in additional CO 2 conversion domains are also discussed. • Summarize critical breakthroughs in CO₂ conversion processes via CMRs over the past five years. • Systematically clarify three types of CO₂ conversion reactions in CMRs with mechanism-oriented sorting. • Incorporate novel plasma technology and solar energy-coupled green processes with their integration advantages. • Propose the research and development direction of the next-generation technology combined with CMRs for CO₂ conversion processes.