Efficient Ni-based catalysts for low-temperature reverse water-gas shift (RWGS) reaction.

CO hydrogenation for syngas can alleviate the pressure of un-controlled emissions of CO and bring enormous economic benefits. Advantageous Ni-catalysts have good CO hydrogenation activity and high CO selectivity merely over 700 °C. Herein, we introduced Cu into Ni catalysts, which were evaluated by H -TPR, XRD, BET, in-situ XPS and CO -TPD, and their CO hydrogenation activity and CO selectivity were significantly affected by the Ni/Cu ratios, which was rationalized by the synergistic effect of bimetallic catalysts. In addition, the reduction temperatures of studied catalysts apparently affected the CO hydrogenation, which were caused by the number and dispersion of the active species. It's found that the Ni Cu -400 had good stability, high CO selectivity (up to 90%), and fast formation rate (1.81×10  mol/g /s) at 400 °C, which demonstrated a good potential as a superior catalyst for reverse water-gas shift (RWGS) reaction.