A near-ambient-pressure XPS study on catalytic CO oxidation reaction over a Ru(101¯0) surface

• Published in: Surface science Vol. 621; pp. 128 - 132
• Main Authors: Toyoshima, Ryo, Shimura, Masahiro, Yoshida, Masaaki, Monya, Yuji, Suzuki, Kazuma, Amemiya, Kenta, Mase, Kazuhiko, Mun, Bongjin Simon, Kondoh, Hiroshi
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01-03-2014; Elsevier
• Subjects: Carbon dioxide; Carbon monoxide; Catalysis; Catalysts; CO oxidation; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Mass spectroscopy; Near-ambient-pressure XPS; Oxidation; Oxides; Physics; Ru([formula omitted]); X-ray photoelectron spectroscopy; Mass spectroscopy; Ru(101¯0); Catalysis; CO oxidation; Near-ambient-pressure XPS; Catalytic reaction; Ru; Oxidation; X-ray photoelectron spectra
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/j.susc.2013.11.005

We investigated the interactions of CO and O2 with Ru(101¯0) single crystal surfaces, and studied the in-situ catalytic oxidation reaction of CO on the surface under near realistic pressure conditions by using a combination of near-ambient-pressure x-ray photoelectron spectroscopy and differential pumping mass spectroscopy. At lower temperatures (T<190°C), most of the surface keeps metallic and is covered by both chemisorbed atomic oxygen and CO, and the CO2 formation rate is relatively slow. At higher temperatures, the reaction rate significantly increases and reaches the saturation, where the Ru surface is dominated by a bulk oxide (i.e. RuO2).
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•CO exposure onto Ru(101¯0) with ambient pressure causes partial dissociation of CO.•Catalytic CO oxidation reaction was studied by in-situ NAP-XPS and mass measurements.•Thin layer of the RuO2 bulk oxide on Ru(101¯0) is a catalytically active phase.