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- W2327306207 abstract "Modification of Pt group catalysts by molybdenum is known to improve catalyst performance in a number of important chemical reactions. To investigate fundamental mechanisms responsible for the promoting effect of Mo, temperature-programmed desorption (TPD) and low energy electron diffraction (LEED) experiments were performed to examine the adsorption of O2, D2, CO, and water on Pt(111) modified with submonolayer quantities of molybdenum. Auger electron spectroscopy (AES) was used to detect and quantify the Mo coverage and X-ray photoelectron spectroscopy (XPS) was employed in conjunction with density functional theory (DFT) calculations to identify Mo species present following various surface treatments. The state of Mo on the surface was found to vary depending on prior surface treatment. Treatment with oxygen resulted in a surface molybdenum oxide, whereas treatment with hydrogen resulted in a reduced bimetallic surface. XPS results indicate that high pressures of oxygen create a higher valent oxide than what is created under ultrahigh vacuum. Oxidized Mo appeared to block Pt surface sites without significantly altering the behavior of species adsorbed on Pt. Reduced surfaces, on the other hand, were shown to decrease yield and desorption temperature for both D2 and CO. Isotopic TPD studies provided evidence of water dissociation on the reduced Mo modified surface, with a maximum extent of water dissociation occurring at intermediate Mo coverages." @default.
- W2327306207 created "2016-06-24" @default.
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- W2327306207 date "2013-12-09" @default.
- W2327306207 modified "2023-09-24" @default.
- W2327306207 title "Interactions of Hydrogen, CO, Oxygen, and Water with Molybdenum-Modified Pt(111)" @default.
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- W2327306207 doi "https://doi.org/10.1021/jp410563s" @default.
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