Low-temperature CO2 methanation over Ru/CeO2: Investigation into Ru loadings

The in-depth study of reaction intermediates, especially metal-support interactions, has brought great promise and challenges to the application of Ru-based catalysts in CO2 methanation. In this study, catalysts with different Ru loadings were prepared by wet impregnation method using CeO2 as the support. It is found that 1%Ru/CeO2 had excellent low-temperature methanation activity compared with other catalysts. As the metal loading in-creases, the oxygen vacancy concentration of the catalyst shows a volcano-type trend and the metal-support interaction increases. In addition, in situ DRIFTS showed that the low-temperature conditions are conducive to the formation of CO intermediates, making the CO2 methanation pathway more inclined to proceed along the CO pathway; while high temperature conditions are conducive to the formation of HCOO* intermediates, making the CO2 methanation pathway more inclined to proceed along the HCOO* pathway. This study demonstrates the importance of precisely determining the influence of metal active sites on the interaction between metal supports and oxygen vacancies for identifying critical reaction pathway intermediates and predicting CO2 methanation performance.

Automated summary

The in-depth study of reaction intermediates, especially metal-support interactions, has brought great promise and challenges to the application of Ru-based catalysts in CO2 methanation. Catalysts with different Ru loadings were prepared using CeO2 as the support, and it was found that 1%Ru/CeO2 showed excellent low-temperature methanation activity. The study also revealed that the concentration of oxygen vacancies and the metal-support interaction increased as the metal loading increased. In addition, the formation of CO intermediates was favored under low-temperature conditions, while the formation of HCOO* intermediates was favored under high-temperature conditions.