High performance of conversion and selectivity of methane to CO via Pt-Pd core-shell structural catalyst

Catalytic oxidation of methane to CO has been investigated in this paper with the employment of a novel core shell structural Pt-Pd catalyst, which exhibits high performance in conversion and selectivity. To figure out the correlation of surface species to reaction selectivity, the particle structure, reaction intermediates, etc. have been characterized via reaction kinetics, isotopic exchange, TPR, and various “in situ” techniques, such as FTIR, XPS and XAS. The oxygen concentration, vacancy, metal surface sites, coordination number, etc. have been further calculated. Core shell catalyst attends to form strong bonding / coordination with carbon ions, therefore, it is very active to dissociate C-H bond in methane. The strong combination of the low coordinated Pd sites to surface oxygen (O*) leads to the blockage or reduction of the complete oxidation of CO, resulting in good catalytic performance of the core shell structural Pt-Pd catalyst in methane conversion and CO selectivity.