Mechanism and active sites of CO oxidation over single-crystal Au surfaces and a Au/TiO2(110) model surface

doi:10.1016/S1872-2067(16)62516-0

Abstract

Abstract:

We describe the reaction mechanism and active sites for CO oxidation over a Au/TiO₂(110) model surface and Au single-crystal surfaces, along with the role of H₂O, on a molecular scale. At low temperature (<320 K), H₂O played an essential role in promoting CO oxidation, and the active site for CO oxidation was the perimeter of the interface between the gold nanoparticles and the TiO₂ support (Au^δ+-O^δ--Ti). We believe that the O-O bond was activated by the formation of OOH, which was produced directly from O₂ and H₂O at the perimeter of the interface between the gold nanoparticles and the TiO₂ support, and consequently OOH reacted with CO to form CO₂. This reaction mechanism explains the dependence of the CO₂ formation rate on O₂ pressure at 300 K. In contrast, at high temperature (>320 K), low-coordinated gold atoms built up on the surface as a result of surface reconstruction due to exposure to CO. The low-coordinated gold atoms adsorbed O₂, which then dissociated and oxidized CO on the metallic gold surface.

Key words: Gold, Model catalyst, CO oxidation, Reaction mechanism, Active sites

Tadahiro Fujitani, Isao Nakamura. Mechanism and active sites of CO oxidation over single-crystal Au surfaces and a Au/TiO₂(110) model surface[J]. Chinese Journal of Catalysis, 2016, 37(10): 1676-1683.

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Mechanism and active sites of CO oxidation over single-crystal Au surfaces and a Au/TiO₂(110) model surface

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