Enhanced Low-Temperature CO 2 Methanation over Bimetallic Ni–Ru Catalysts

作者：Yutong Pan, Xiaoyu Han, Xiao Chang, Heng Zhang, Xiaohui Zi, Ziwen Hao, Jiyi Chen, Ziji Lin, Maoshuai Li, Xinbin Ma · 发表于：Industrial & Engineering Chemistry Research · 年份：2023 · DOI：10.1021/acs.iecr.2c04560 · 被引用次数：53 · 研究领域：Catalysts for Methane Reforming、Catalytic Processes in Materials Science、Carbon dioxide utilization in catalysis

Nickel-based catalysts are the most promising selection for CO 2 methanation. But, it is challenging for monometallic Ni to achieve high CO 2 conversion at low temperature. This study develops ceria-supported bimetallic Ni–Ru catalysts that are highly efficient for low-temperature methanation. A small amount of Ru (0.2 wt %) addition to Ni enables the intermetal interaction, and enhances the dispersion of Ni particles with a more active surface, consequently boosting the catalytic capacity for hydrogen activation and CO adsorption. The bimetallic Ni–Ru catalysts exhibit a more than 3-fold rate enhancement at low temperature for selective methanation of CO 2 relative to the monometallic Ni/CeO 2 . Operando IR spectroscopy identifies the formate route as the major reaction mechanism over the monometallic Ni, and the presence of Ru in the bimetallic catalysts can induce the *CO-intermediate mechanistic pathway, contributing to the enhanced production of methane.