Abstract
Methane adsorption and possible dehydrogenation mediated by the free gold–palladium clusters Au2Pd+, AuPd2+, and Au2Pd2+ have been investigated in an ion trap experiment under multi-collision conditions. Temperature dependent kinetic measurements identify the palladium-rich AuPd2+ as the only one among these clusters which is able to dehydrogenate methane. The comparison with previously measured reactions of the bare gold Aun+ (n=2–4) as well as the bare palladium Pdm+ (m=2–4) clusters allows to obtain insights into cluster size and composition dependent reaction mechanisms, kinetics, and methane binding energies.
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