In this work, the mechanism and kinetics of the preferential CO oxidation over 0.5 wt. % Au/Al 2 O 3 catalyst was investigated. For CO oxidation, the reaction was found to follow a two-step Eley-Rideal-type mechanism, in which the formation and decomposition of the reaction intermediate took place at the gold-support interface. For the PROX case, on the other hand, Langmuir-Hinshelwood-type mechanisms seem to be also significant.
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