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• W2002135215 abstract "The influence of co-adsorbed 18 O 2 ( 18 O) on NO/C 2 H 4 reactions on the surface of stepped Pt(332) has been investigated using Fourier transform infrared reflection–absorption spectroscopy (FTIR-RAS) and thermal desorption spectroscopy (TDS). The presence of 18 O 2 ( 18 O) results in changes in C 2 H 4 dissociation behavior, with formation of ethylidyne taking place at surface temperature much higher than that in the absence of 18 O 2 ( 18 O). Pre-annealing 18 O 2 /C 2 H 4 co-adlayers to 250 and 300 K does not lead to significantly different IR spectra, but a variety of spectra are observed when the 250 K and 300 K 18 O/C 2 H 4 co-adlayers are further exposed to 0.8 L NO at 90 K, depending on the 18 O 2 pre-exposure. NO adsorption in bridge sites, both on steps and on terraces is more significantly suppressed for the co-adlayers in which 18 O 2 /C 2 H 4 is pre-annealed to 250 K. This site-blocking effect is enhanced with increasing 18 O 2 exposure. However, no new surface species, which are intermediates for N 2 production, are detected. Thermal desorption spectra indicate that various species are produced, but only N 2 and H 2 desorption have intensities that can be reliably analyzed (that is to be able to quantitatively elucidate how the yields of these two species vary with change in the ratios of NO to C 2 H 4 and 18 O 2 ). Desorption of both N 2 and H 2 is more strongly dependent on 18 O 2 exposure than on the temperature to which 18 O 2 /C 2 H 4 adlayers are pre-annealed. The presence of 18 O 2 , irrespective of the dosing sequence, suppresses N 2 desorption, but this effect is much weaker when 18 O 2 is post-dosed. For the case with 18 O 2 pre-dosed, irrespective of the annealing temperature (250 K or 300 K), N 2 desorption is greatly suppressed at an 18 O 2 exposure of 0.2 L, but thereafter remains almost unchanged with increasing 18 O 2 exposure from 0.4 to 1.6 L. This feature of N 2 desorption is explained by the restoration of the adsorption of NO onto steps and the subsequent NO dissociation on these sites. In contrast, H 2 desorption decreases continuously and disappears at 0.8 L 18 O 2 and higher. It is concluded that the presence of 18 O 2 in the reaction of NO with C 2 H 4 on the surface of Pt(332) does not play any role of activating the surface reactants.Key words: NO, platinum, C 2 H 4 , deNOx, hydrocarbon, selective catalytic reduction." @default.
• W2002135215 created "2016-06-24" @default.
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• W2002135215 creator A5071516287 @default.
• W2002135215 date "2008-01-01" @default.
• W2002135215 modified "2023-09-23" @default.
• W2002135215 title "Interactions among ¹⁸O₂, C₂H₄, and NO on the surface of stepped Pt(332)" @default.
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• W2002135215 doi "https://doi.org/10.1139/v07-133" @default.
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