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- W2890928766 abstract "In this work, we oxidized Pd(111) in ultrahigh vacuum (UHV) using an O atom beam, and investigated the molecular chemisorption of O_2 on the oxidized surface using temperature programmed desorption (TPD). We find that the O_2 molecules chemisorb readily on oxidized Pd(111) at 85 K, reaching a saturation coverage of 0.33 ML on a surface covered with 3 ML (monolayer) of Pd oxide. The O_2 TPD spectrum from the oxidized surface at O_2 saturation exhibits four features centered at 118 K, 227 K, 275 K and 315 K associated with the desorption of chemisorbed O_2 molecules. Comparison with O_2 TPD from clean Pd(111) demonstrates that about half of the O_2 molecules on oxidized Pd(111) are more strongly bound than on the metallic surface. Experiments with co-adsorbed 16O_2 and 18O_2 further reveal that O_2 molecules dissociate negligibly on the oxidized surface. We also find that O_2 molecules chemisorb only in small quantities ( < 0.03 ML) on the p(2?2) and 2D oxide phases of atomic oxygen on Pd(111), indicating that these phases have much weaker binding affinities toward O_2 than the 3D oxide (PdO) generated in our experiments. Finally, temperature programmed reaction spectra of co-adsorbed 18O2 and CO demonstrate that both PdO and molecularly adsorbed O_2 are reactive in CO oxidation, with the molecular O_2 exhibiting slightly higher reactivity. The results of this study may have implications for understanding Pd oxidation catalysis at high pressures given that we find relatively strong binding states of O_2 on oxidized Pd(111) and observe that these molecules are reactive toward CO. ( en )" @default.
- W2890928766 created "2018-09-27" @default.
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- W2890928766 date "2007-01-01" @default.
- W2890928766 modified "2023-09-29" @default.
- W2890928766 title "Molecular Chemisorption of O2 on Oxidized Pd(111)" @default.
- W2890928766 hasPublicationYear "2007" @default.
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