Gold catalysts readily catalyze CO oxidation at subambient temperature, wherein moisture can influence the activity, typically with a volcano-shaped dependence. In this study, we examine moisture-enhanced CO oxidation over Au/BN. The room-temperature CO oxidation activity of Au/BN increases quickly with increasing moisture content up to 100% relative humidity (RH). In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and in situ UV–vis diffuse reflectance spectroscopy (UV-vis-DRS) demonstrate that mainly metallic gold is present on the h-BN support. Surface intermediates are found when moisture is fed together with CO and O 2, attributable to *CO(H 2 O) n and *OOH, respectively. These surface intermediates are reactive when counter-reactant is purged. Injection of isotope-labeled H 2 18 O demonstrates that OH from H 2 O takes part in the process of CO 2 formation. The results of this study provide direct evidence showing moisture-enhanced CO adsorption, moisture-enhanced O 2 adsorption, and their activation that can possibly lead to promotion of CO oxidation over the Au/BN catalyst.
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Tran‐Thuy et al. (2017) studied this question.
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