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Facile Cr3+-Doping Strategy Dramatically Promoting Ru/CeO2 for Low-Temperature CO2 Methanation: Unraveling the Roles of Surface Oxygen Vacancies and Hydroxyl Groups by Xu, Xianglan (author);Liu, Li (author);Tong, Yunyan (author);Fang, Xiuzhong (author);Xu, Junwei (author);Jiang, De-en (author);Wang, Xiang (author) is a Chemistry article available to read on EtoBox.

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Cr cation doping in the support of the Ru/CeO 2 catalyst with a Cr/Ce molar ratio of 1:9 dramatically improved the CO 2 methanation activity at low temperatures, with the turnover frequency value on Ru/Ce 0.9 Cr 0.1 O x at 150 °C being 5.3 times higher than that on Ru/CeO 2 . X-ray diffraction and Raman spectroscopy results confirmed the Cr 3+ doping in the lattice of the CeO 2 support. Thus, more reactive surface oxygen formed on the Ce 0.9 Cr 0.1 O x support, and the Ru/Ce 0.9 Cr 0.1 O x catalyst contained more oxygen vacancies and hydroxyl groups during the reduction process than the Ru/CeO 2 catalyst. In situ Fourier transform infrared spectroscopy and temperature-programed surface reaction revealed that CO 2 methanation on both Ru/Ce 0.9 Cr 0.1 O x and Ru/CeO 2 catalysts followed the formate and CO* pathways, with the former being dominant at low temperatures. The formate pathway was identified, in which CO 2 interacted with surface hydroxyl groups to produce adsorbed bicarbonates; then, the bicarbonates were further converted to formates, followed by the formation of CH 4 *. Cr 3+ doping increased the number of surface oxygen vacancies and hydroxyl groups, thus increasing the

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Author

Xu, Xianglan (author);Liu, Li (author);Tong, Yunyan (author);Fang, Xiuzhong (author);Xu, Junwei (author);Jiang, De-en (author);Wang, Xiang (author)

Publisher

American Chemical Society (ACS)

Published

2021

Language

EN

Field

Chemistry (Physical Sciences)