Efficient Ni‐based catalysts for low‐temperature reverse water‐gas shift (RWGS) reaction
Lidan Deng, Xin Ai, Fengqiong Xie, Guilin Zhou
Abstract
Abstract CO 2 hydrogenation for syngas can alleviate the pressure of un‐controlled emissions of CO 2 and bring enormous economic benefits. Advantageous Ni‐catalysts have good CO 2 hydrogenation activity and high CO selectivity merely over 700 °C. Herein, we introduced Cu into Ni catalysts, which were evaluated by H 2 ‐TPR, XRD, BET, in‐situ XPS and CO 2 ‐TPD, and their CO 2 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 2 hydrogenation, which were caused by the number and dispersion of the active species. It's found that the Ni 1 Cu 1 ‐400 had good stability, high CO selectivity (up to 90%), and fast formation rate (1.81×10 −5 mol/g cat /s) at 400 °C, which demonstrated a good potential as a superior catalyst for reverse water‐gas shift (RWGS) reaction.