The importance of the exposed interface between Au and the support metal oxide has been suggested in the literature. Here we summarize evidence that provide strong support as well as conflicting evidence for this type of active sites and the potential reaction mechanism that takes place. Evidence from three reactions are summarized: CO oxidation, water gas shift (WGS) reaction, and selective oxidation of propane. Implications for potential future research and ability to truly design selective catalysts are discussed.
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