The effects of K on the mechanism for the water-gas shift reaction (CO + H2O = H2 + CO2) has been investigated on metals, Cu(111) and Au(111), and metal-oxide interfaces, Cu-TiO2(110) and Au-TiO2(110), using a combination of in-situ techniques: X-ray absorption spectroscopy (XAS), infrared spectroscopy (IR), and ambient-pressure X-ray photoelectron spectroscopy (AP-XPS). Under reaction conditions, the metal and metal/oxide catalysts undergo chemical transformations that drastically modify their catalytic activity. In the presence of the alkali, the oxide support is not a simple spectator during reaction, facilitating the dissociation of water and in some cases modifying the chemical properties of the supported metal. Data of AP-XPS and IR spectroscopy indicate that formate species are not necessarily involved in the main reaction path for the water-gas shift on the alkali-modified systems. Thus, a pure redox mechanism or associative mechanisms that involve either carbonate-like (CO3, HCO3) or carboxyl (HOCO) species should be considered.

Effects of K on the mechanism for the water-gas shift reaction on metals and metal-oxide interfaces

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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