Abstract
In this study, the catalytic activity and changes in the oxidation state during the Fischer–Tropsch (FT) reaction were investigated at a low pressure on oxidized subnanometer size-selected cobalt clusters deposited on oxide (Al2O3, MgO) and carbon-based (ultrananocrystalline diamond, UNCD) supports by temperature-programmed reaction (TPRx) combined with in situ grazing-incidence X-ray absorption spectroscopy (GIXAS). The activity and selectivity of ultrasmall CoOx clusters exhibit a very strong dependence on cluster size and support. The evolution of the oxidation state of the clusters during the reaction reveals that cluster–support interaction plays a key role in the reaction.
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