Mn-Doped Raney Copper Catalysts for Enhanced Reverse Water–Gas Shift Reaction Performance

A series of promoter-doped Raney copper catalysts were prepared via a dealloying method, and their catalytic performance was evaluated in the reverse water–gas shift (RWGS) reaction. It was found that significantly improved CO 2 conversion and CO selectivity were achieved upon Mn doping over the catalyst. Mn existed in the form of a highly dispersed MnO phase, effectively regulating the electronic state and geometry of the active Cu component, thereby promoting the dissociation and adsorption of H 2 and the activation of CO 2 . Under optimized reaction conditions of a gas space velocity of 3000 mL·g cat −1 ·h −1 , a temperature of 600°C, and a Mn doping content of 5 wt%, the catalyst demonstrated a CO 2 conversion of 37.8% and a CO selectivity of 99.9%. Furthermore, after reaction at 600°C for 200 h, the catalyst retained high catalytic activity and structural stability, demonstrating promising prospects for practical application. This study provides crucial theoretical support and experimental evidence for designing highly efficient and stable Cu-based catalysts for the RWGS reaction. Graphical Mn-doped Raney copper catalysts were prepared by dealloying. The Mn promoter was uniformly and highly dispersed in the catalyst in the form of MnO, which enhanced the CO 2 adsorption capacity and H 2 dissociation capacity, thereby improving the catalytic performance of the RWGS reaction.