N-Coordinated Dual-Metal Single-Site Catalyst for Low-Temperature CO Oxidation
Jing Wang, Rui You, Chao Zhao, Wei Zhang, Wei Liu, Xin‐Pu Fu, Yang Yang Li, Fangyao Zhou, Xusheng Zheng, Qian Xu, Tao Yao, Chun‐Jiang Jia, Yang‐Gang Wang, Weixin Huang, Yuen Wu
Abstract
Catalysts for CO oxidation reaction are mainly based on oxide/hydroxide materials with multicomponent active sites. Here, we report a nonoxide/hydroxide material, atomically dispersed dual-metal single sites (Fe–Co sites) on N-doped carbon support, as a highly active catalyst for CO oxidation. It can greatly lower the temperature for complete CO conversion as low as −73 °C with a turnover frequency of 0.096 s–1. X-ray absorption near-edge structure spectra, pulse-adsorption microcalorimetry, and density functional theory studies show that the Fe–Co sites synergistically catalyze CO oxidation facilely following the Langmuir–Hinshelwood (L-H) mechanism with CO preferentially adsorbing at the Co sites and O2 adsorbing at the Fe sites. These results, for the first time, reveal that the dual-metal single site on N-doped carbon can efficiency catalyze low-temperature CO oxidation reaction without the involvement of supports, such as oxygen vacancies and surface hydroxyl groups.