Novel inverse oxide/metal catalysts for methanol synthesis: impact of oxide-metal interactions and reversible morphological changes.

Inverse oxide/metal catalysts have proved to be excellent systems for the generation of methanol by CO2hydrogenation or the partial oxidation of methane. These systems can exhibit unique structural and chemical properties due to the nano size of the oxide component and strong oxide-metal interactions. Recent studies for ZnO/Cu, CeO2/Cu, TiO2/Cu, MgO/Cu, In2O3/Cu, and In2O3/Au catalysts have shown large variations in the composition and morphology of the oxide overlayer as a function of temperature and chemical environment. These oxide-metal interfaces are able to react with CO2and CH4at room temperature, and both reactants have a strong influence on the physical and chemical properties of the catalysts. Under reaction conditions, switches between oxide-metal and metal-metal interfaces can take in the catalyst surface. A dynamic behavior that can be linked to a high selectivity for methanol production over systems such as ZnO/Cu, CeO2/Cu and In2O3/Au. This type of correlation deserves additional systematic studies since it could be a powerful tool for designing highly efficient catalysts for methanol synthesis.