Strong metal-support interactions between highly dispersed Cu+ species and ceria via mix-MOF pyrolysis toward promoted water-gas shift reaction

• Published in: Journal of energy chemistry 2024-04, Vol.91, p.475-483
• Main Authors: Sun, Xiao-Chen, Li, Xing-Chi, Xie, Ze-Wei, Yuan, Chen-Yue, Wang, De-Jiu, Zhang, Qian, Guo, Xiao-Yu, Dong, Hao, Liu, Hai-Chao, Zhang, Ya-Wen
• Format: Article
• Language: English
• Subjects: Cu-based catalyst; Metal-support interaction; MOF derivative; Water-gas shift reaction
• ISSN: 2095-4956
• DOI: 10.1016/j.jechem.2023.12.046

The Cu-CeO2 metal-support interaction was enhanced via mix-MOF pyrolysis to promote water-gas shift reaction performance. [Display omitted] The modulation of metal-support interfacial interaction is significant but challenging in the design of high-efficiency and high-stability supported catalysts. Here, we report a synthetic strategy to upgrade Cu-CeO2 interfacial interaction by the pyrolysis of mixed metal-organic framework (MOF) structure. The obtained highly dispersed Cu/CeO2-MOF catalyst via this strategy was used to catalyze water-gas shift reaction (WGSR), which exhibited high activity of 40.5 μmolCO gcat.−1 s−1 at 300 °C and high stability of about 120 h. Based on comprehensive studies of electronic structure, pyrolysis strategy has significant effect on enhancing metal-support interaction and then stabilizing interfacial Cu+ species under reaction conditions. Abundant Cu+ species and generated oxygen vacancies over Cu/CeO2-MOF catalyst played a key role in CO molecule activation and H2O molecule dissociation, respectively. Both collaborated closely and then promoted WGSR catalytic performance in comparison with traditional supported catalysts. This study shall offer a robust approach to harvest highly dispersed catalysts with finely-tuned metal-support interactions for stabilizing the most interfacial active metal species in diverse heterogeneous catalytic reactions.