In situ Doping Coupling With Vacancy Regulation Induced Strong Metal‐Support Interaction in Ni/CaTiO<sub>3</sub> to Boost Supercharged Photothermal CO<sub>2</sub> Methanation
Zhimin Yuan, Baokun Zhang, Xianglin Zhu, Shenghua Wang, Wei Sun, Baibiao Huang, Zaiyong Jiang, Ying Dai, Zheng Wang, Wei Wei, Xi–Shi Tai, Ya‐Qian Lan
Abstract
Abstract The “Solar Sabatier” reaction has emerged as a promising sustainable method for the CO 2 hydrogenation. The development of advanced metal‐support catalysts based on Strong Metal‐Support Interaction (SMSI) offers significant advantages in the activation of CO 2 and the regulation of selectivity. Herein, a novel composite Ni/CaTiO 3 catalyst consisting of Ni and Ni‐doped CaTiO 3 is synthesized and utilized in the CO 2 methanation. A noteworthy finding is that the incorporation of Ni into the CaTiO 3 matrix is instrumental in the formation of oxygen vacancies and the establishment of SMSI between Ni and CaTiO 3 . The enhanced SMSI resulting from the surface‐doped Ni atoms not only facilitated effective interface contact between metallic Ni and the CaTiO 3 surface but also significantly improved the migration efficiency of hydrogen atoms reduced the reaction barrier for CO 2 methanation and optimized the rate‐limiting step, all of which are advantageous for the CO 2 methanation. Consequently, the optimized catalysts exhibited extraordinary performance, achieving a CO 2 conversion rate of 87.77%, CH 4 generation rate of 3.12 mol g Ni −1 h −1 , and ≈100% CH 4 selectivity under ambient pressure conditions. This investigation lays the groundwork for the design of highly active “Solar Sabatier” catalysts and offers a novel understanding of the mechanisms underlying effective SMSI.