摘要
Catalytic carbon dioxide (CO 2 ) hydrogenation to carbon monoxide (CO) via reverse water-gas shift (RWGS) reaction is of particular interest due to its direct use in various industrial processes as feedstock. However, the competitive CO 2 methanation process severely limits the RWGS reaction in a lower temperature range. In this context, we propose a novel nanocatalyst (NC) comprising oxygen vacancy-enriched subnanometer-scale CoPd hybrid cluster (CoO x V Pd)-anchored Pd nanoparticles (NPs) on cobalt oxide support underneath (denoted as CP-CoO x V Pd) by using a galvanic replacement reaction-assisted wet chemical reduction method. As-developed CP-CoO x V Pd NC initiated the RWGS reaction at 423 K temperature while showing an optimum CO production yield of ∼3414 μmol g −1 catalyst and a CO selectivity as high as ∼99% at 523 K in the reaction gas of CO 2 :H 2 = 1:3. The results of physical characterizations along with electrochemical and gas chromatography (GC) suggest that abundant oxygen vacancies in the surface-anchored CoO x V Pd clusters are vital for CO 2 adsorption and subsequent activation, while neighboring Pd domains facilitate the H 2 dissociation. The obtained results are expected to provide a feasible design of Co-based NCs for the RWGS reaction.