Chemical reactions on cluster-assembled heterogeneous catalysts are highly dynamic, from reactant activation and spillover to diffusion and sintering of active particles. In this work, highly sensitive integral reactivity measurements via thermal desorption have been implemented together with a fast local dynamics characterization via Scanning Tunneling Microscopy (STM). Truly monodisperse Pd clusters on a periodically wettable hexagonal boron nitride substrate, h-BN/Rh(111), have been successfully studied concerning CO oxidation and ethene hydrogenation reactivity, as well as mobility and stability under STM. Fast STM experiments with up to 8 frames/s time resolution reveal specific motions within the boron nitride troughs.
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Chemical reactions on cluster-assembled heterogeneous catalysts are highly dynamic, from reactant activation and spillover to diffusion and sintering of active particles. In this work, highly sensitive integral reactivity measurements via thermal desorption have been implemented together with a fast local dynamics characterization via Scanning Tunneling Microscopy (STM). Truly monodisperse Pd clusters on a periodically wettable hexagonal boron nitride substrate, h-BN/Rh(111), have been successfu...
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