Ni Single Atoms Confined in Nitrogen-Doped Carbon Nanotubes for Active and Selective Hydrogenation of CO<sub>2</sub> to CO
Dongdong Wang, Zhenxuan Yuan, Xi‐Lin Wu, Wei Xiong, Jieqiong Ding, Zhenhua Zhang, Weixin Huang
Abstract
Developing efficient non-precious-metal catalysts capable of selectively converting CO 2 into fuels and chemicals is desirable yet remains a challenge. Ni-based catalysts usually exhibit high activity in methanation reactions but low selectivity and stability in the reverse water-gas shift (RWGS) reaction. Herein, we report a Ni single-atom catalyst with Ni–N x motifs confined in N-doped carbon nanotubes as an active, selective, and stable catalyst for the RWGS reaction, achieving almost 100% CO selectivity with a STY of 1.88 mol CO g Ni –1 h –1 at 500 °C and atmospheric pressure. In addition to weak CO adsorption, strong CO 2 adsorption and weak H 2 adsorption at the Ni–N x active site were found to be responsible for the high catalytic activity and CO selectivity.