NO and Deuterium Co-Adsorption on the Reconstructed Pt(100)-hex Surface: A Temperature Programmed Reaction Study Full article
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Surface Science
ISSN: 0039-6028 |
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| Output data | Year: 2000, Volume: 453, Number: 1-3, Pages: 103-111 Pages count : 9 DOI: 10.1016/S0039-6028(00)00311-3 | ||
| Tags | Deuterium, Hydrogen molecule, Nitrogen oxides, Platinum, Surface relaxation and reconstruction | ||
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Abstract:
The deuterium adsorption at 270 K on a reconstructed Pt(100)-hex surface covered by NOads was studied by means of temperature programmed reaction (TPR). In the case of adsorption on a clean Pt(100)-hex surface the saturated Dads coverage is 0.06 ML at PH2 =6×10−8 mbar, whereas the Dads uptake is enhanced considerably by NO pre-adsorption. First the Dads uptake increases with increasing NOads coverage, h NO, reaching a maximum at h NO#0.25 ML, and then decreases to zero. This phenomenon is explained as follows. The NO adsorption on the hex
surface leads to the formation of 1×1 islands saturated by NOads and surrounded by the hex phase. The NOads/1×1 islands are assumed to modify the hex phase adjacent to the island boundaries, adapting this area for deuterium adsorption. TPR in the co-adsorption layer of NOads and Dads is initiated by D2 desorption and shows an ‘explosive’ behaviour, manifesting itself in the narrow TPR peaks of N2 and D2 O at ~370 K. The NOads pre-coverage affects the reaction temperature as well. Thus, at NOads coverage of 0.35–0.40 ML the temperature of the surface explosion increases abruptly by ~15–20 K. At this coverage the NOads/1×1 islands are supposed to modify the rest of the hex phase so that, after further D2 adsorption, the surface becomes completely saturated by Dads and NOads species. A possible mechanism for this is discussed.
Cite:
Vovk E.I.
, Smirnov M.Y.
, Zemlyanov D.Y.
NO and Deuterium Co-Adsorption on the Reconstructed Pt(100)-hex Surface: A Temperature Programmed Reaction Study
Surface Science. 2000. V.453. N1-3. P.103-111. DOI: 10.1016/S0039-6028(00)00311-3 WOS Scopus РИНЦ ANCAN OpenAlex
NO and Deuterium Co-Adsorption on the Reconstructed Pt(100)-hex Surface: A Temperature Programmed Reaction Study
Surface Science. 2000. V.453. N1-3. P.103-111. DOI: 10.1016/S0039-6028(00)00311-3 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Sep 16, 1999 |
| Accepted: | Jan 20, 2000 |
| Published print: | May 10, 2000 |
| Published online: | May 15, 2000 |
Identifiers:
| Web of science: | WOS:000087302400018 |
| Scopus: | 2-s2.0-0001732154 |
| Elibrary: | 13359250 |
| Chemical Abstracts: | 2000:322143 |
| Chemical Abstracts (print): | 133:34803 |
| OpenAlex: | W2052697336 |