Formate and CO* Radicals Intermediated Atmospheric CO2 Conversion over Co–Ni Bimetallic Catalysts Assembled on Diatomite

作者：Lixing Liang, Yujie Lin, Wentao Zhou, Yonghui Peng, Jianyu Ge, Jinlong Jiang, Jing Ouyang · 发表于：ACS Applied Materials & Interfaces · 年份：2024 · DOI：10.1021/acsami.4c10819 · 被引用次数：7 · 研究领域：Catalytic Processes in Materials Science、Catalysts for Methane Reforming、Catalysis and Oxidation Reactions

There exists an imperative exigency to ascertain catalysts of cost-effectiveness and energy efficiency for the facilitation of industrial CO 2 methanation. In this area, the dual metal synergistic enhancement of the metal–support interaction emerges as a highly promising strategy. Here, Diatomite (Dt) was used as the support, and a series of CoyNi/Dt (Co as the first component and Ni as the second component) composite catalysts were constructed using an ultrasound-assisted coimpregnation method. Different Co/Ni molar ratios had a significant impact on the phase structure, chemical properties, morphological characteristics, and NiCo crystal structure of the x Co y Ni/Dt materials. When the Co/Ni molar ratio was set to 2.0, a Ni–Co alloy was obtained, which is the key to improve the catalytic activity. Compared to the other x Co y Ni/Dt catalysts, the bimetallic catalyst 2Co1Ni/Dt exhibited superior CO 2 catalytic performance and stability, achieving a 76% CO 2 conversion and 98% CH 4 selectivity at 425 °C. The in situ DRIFTS results indicated that CO 2 methanation over the 2Co1Ni/Dt catalyst followed the reaction pathway with formate and CO* radicals as the intermediates.