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• W2056512648 endingPage "20343" @default.
• W2056512648 startingPage "20337" @default.
• W2056512648 abstract "We present results of an investigation into the reactivity of molecularly chemisorbed oxygen with CO on a Au/TiO2 model catalyst at 77 K. We previously discovered that exposing the model catalyst sample to a radio-frequency-generated plasma jet of oxygen results in co-population of both atomically and molecularly chemisorbed oxygen species on the sample. We tested the reactivity of the molecularly chemisorbed oxygen by comparing the CO2 produced from a sample populated with both species to the CO2 produced from a sample that has been cleared of molecularly chemisorbed oxygen employing collision-induced desorption. Samples that are populated with both species consistently result in greater CO2 produced than samples with only atomic oxygen. We interpret this result to indicate that molecularly chemisorbed oxygen on the sample can directly participate in the CO oxidation reaction. The reactivity of molecularly chemisorbed oxygen has been investigated for five different gold coverages (0.5, 0.75, 1, 1.25, and 2 ML), and we observe that there is a greater fractional difference in the CO2 produced (difference between sample populated with both molecularly and atomically adsorbed oxygen and sample populated solely with atomically adsorbed oxygen) for the 1 ML Au coverage than for the other coverages for equivalent oxygen plasma-jet exposures. However, it is not possible to unambiguously conclude that this observation is directly related to a particle size effect on the chemistry since the absolute O(2,a) and O(a) content on the various surfaces is different for all the coverages studied because of the plasma-jet technique that we employed for populating the surfaces with oxygen. Unfortunately, this precludes a direct comparison of the reactivity of molecular oxygen in the carbon monoxide oxidation reaction as a function of gold coverage and hence particle size." @default.
• W2056512648 created "2016-06-24" @default.
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• W2056512648 date "2006-09-21" @default.
• W2056512648 modified "2023-10-16" @default.
• W2056512648 title "Reactivity of Molecularly Chemisorbed Oxygen on a Au/TiO₂ Model Catalyst" @default.
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• W2056512648 doi "https://doi.org/10.1021/jp062766c" @default.
• W2056512648 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17034215" @default.
• W2056512648 hasPublicationYear "2006" @default.
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