Facilitating the dry reforming of methane with interfacial synergistic catalysis in an Ir@CeO2−x catalyst
Hui Wang, Guoqing Cui, Lu Hao, Zeyang Li, Lei Wang, Hao Meng, Jiong Li, Hong Yan, Yusen Yang, Min Wei
Abstract
Abstract The dry reforming of methane provides an attractive route to convert greenhouse gases (CH 4 and CO 2 ) into valuable syngas, so as to resolve the carbon cycle and environmental issues. However, the development of high-performance catalysts remains a huge challenge. Herein, we report a 0.6% Ir/CeO 2− x catalyst with a metal-support interface structure which exhibits high CH 4 (~72%) and CO 2 (~82%) conversion and a CH 4 reaction rate of ~973 μmol CH4 g cat −1 s −1 which is stable over 100 h at 700 °C. The performance of the catalyst is close to the state-of-the-art in this area of research. A combination of in situ spectroscopic characterization and theoretical calculations highlight the importance of the interfacial structure as an intrinsic active center to facilitate the CH 4 dissociation (the rate-determining step) and the CH 2 * oxidation to CH 2 O* without coke formation, which accounts for the long-term stability. The catalyst in this work has a potential application prospect in the field of high-value utilization of carbon resources.