Highly Efficient CO2 to CO Transformation over Cu‐Based Catalyst Derived from a CuMgAl‐Layered Double Hydroxide (LDH)

Abstract Supported Cu‐based catalysts are promising catalysts for RWGS reactions. Herein, CuMgAl‐LDHs (LDHs: Layered double hydroxides) were used as the precursors to obtain supported Cu with good dispersion and high stability. The reduction of CuMgAl‐LDH at 400 °C led to the formation of 0.3CuMgAl‐LDH‐400, with Cu nanoparticles well dispersed on MgO/Al 2 O 3 , which exhibited superior activity and high stability for RWGS. 33.5 % of CO 2 was converted, with selectivity of almost 100 % to CO at 350 °C under a high space velocity, among the highest for RWGS ever reported for Cu‐based catalysts, especially at a low reaction temperature. In‐situ DRIFTS and CO 2 ‐TPD revealed that its superior performance is attributed to high Cu dispersion which is beneficial for the dissociation of H 2 , as well as the presence of variety of basic sites for adsorption towards CO 2 to facilitate the formation of formates. This study demonstrates the great opportunity of LDHs in the preparations of supported metal‐based catalysts.