(207a) The Role of Oxygen Vacancies of CeO2 Supported Catalyst on Catalytic Performance of the CO2 to CO
Oxygen vacancies generated by the reducible cerium oxide were found to be able to contribute more carbonate with bidentate type absorption. The space confined method was capable of generating high Cu dispersion (~50%) from nano-size CuCeOx solid solution. The Cu maintains the CeO2 support to keep the oxygen vacancies recycling by hydrogen spill over behavior at 300oC when the reaction of CO2 to CO oxidized the catalyst. However, similar metal-support was not seen in the mesopeorous silica system.
We have demonstrated that the active sites locate in the proximity between support and reduced nano-sized metal by synchrotron analysis, TEM mapping, in-situ FTIR and catalytic reaction. Furthermore, the work presented illustrates the significant role of oxygen vacancies in the metal-support interaction and how the potential of oxide supported nanocatalysts can be further explored and tuned by for the space confined method and thermal treatment for CO2 to CO.