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- W2039456458 abstract "Batch reactor results and analysis are reported for the reaction of NO with O2 to form NO2 over a Pt(1 1 1) single crystal at atmospheric pressure. The apparent activation energy and NO, O2, and NO2 reaction orders are found to be 80 kJ mol−1, 1.3, 1, and −2 and are comparable to previous studies on supported Pt catalysts which take inhibition by the product NO2 into account. The absolute rates on a per Pt atom basis are the highest yet reported 0.34 ± 0.02 s−1, at 300 °C, 73 ppm NO, 27 ppm NO2 and 5% O2. Auger electron spectroscopy and X-ray photoelectron spectroscopy are used to show that the surface chemisorbed oxygen coverage under reaction conditions is 0.76 ± 0.06 ML, consistent with a coverage controlled by NO2 dissociation. DFT calculations are used to compare the stability of possible surface intermediates on a clean Pt(1 1 1) surface with those on a p(√3 × √3)-2O (2/3 ML) ordering surface. In contrast to the clean surface, O2 adsorption and dissociation are endothermic at 2/3 ML oxygen, but a peroxynitrite intermediate OONO* is slightly stable and may provide an alternative, associative pathway to NO2 formation that is consistent with the observed first order reaction kinetics in O2." @default.
- W2039456458 created "2016-06-24" @default.
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- W2039456458 date "2008-07-01" @default.
- W2039456458 modified "2023-10-16" @default.
- W2039456458 title "Coupled theoretical and experimental analysis of surface coverage effects in Pt-catalyzed NO and O2 reaction to NO2 on Pt(111)" @default.
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- W2039456458 doi "https://doi.org/10.1016/j.cattod.2007.12.139" @default.
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