Mo-based bimetallic oxide catalysts for the reverse water gas shift reaction

• Published in: International journal of hydrogen energy Vol. 68; pp. 1 - 7
• Main Authors: Dai, Hui, Deng, Xiaobing, Zhang, Anhang, Zhu, Yongqing, Xiao, Xin, Wang, Yan, Zhou, Changjian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 28.05.2024
• Subjects: Alkalinity; Carbon dioxide; Mo-based catalyst; Oxygen vacancy; RWGS; Alkalinity; Mo-based catalyst; RWGS; Carbon dioxide; Oxygen vacancy
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2024.04.238

The reverse water gas shift (RWGS) is of great significance to the resource utilization of CO2. In this paper, based on the features of MoO3, the Mo-based catalysts doped with Ga, Ti and Ce were prepared, and the effects of oxygen vacancies and basic sites on the RWGS reaction were studied. When the volume ratio of H2 and CO2 is 1 : 1, the yield of CO can reach 26.66%. Because it exposes higher concentration of Ce sites and moderate alkaline active sites on the surface. When the proportion of H2 in the reaction gas increases, the highest yield of CO can reach 54.53%, which is mainly attributed to a large number of oxygen vacancies on the surface of MoTi. This study can be used as a reference for the design of catalysts for RWGS reaction under different reaction conditions. A series of Mo-based catalysts were prepared, and the significance of oxygen vacancies and surface basic sites in RWGS reaction was explored, and a reference was provided for the study of similar catalytic materials under different reaction gas ratios. [Display omitted] •MoO3 by doping transition metal has a good application prospect in RWGS reaction.•The yield of MoTi and MoCe is close to equilibrium in RWGS reaction.•High CO2 concentration is good for MoTi with higher density oxygen vacancies.•High H2 concentration is good for MoCe with higher density surface basic sites.