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Titolo:
In-situ observation of hydrogenation of ethylene on a Pt(111) surface under atmospheric pressure by infrared reflection absorption spectroscopy
Autore:
Ohtani, T; Kubota, J; Kondo, JN; Hirose, C; Domen, K;
Indirizzi:
Tokyowa,st Technol, Resources Utilizat Res Lab, Midori Ku, Yokohama, Kanaga Tokyo Inst Technol Yokohama Kanagawa Japan , Midori Ku, Yokohama, Kanaga
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 22, volume: 103, anno: 1999,
pagine: 4562 - 4565
SICI:
1520-6106(19990603)103:22<4562:IOOHOE>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUM-FREQUENCY GENERATION; BONDED ETHYLENE; METAL-SURFACES; DEHYDROGENATION; RAIRS; IRAS;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Domen, K TokyoYokohama,hnol, Resources Utilizat Res Lab, Midori Ku, 4259 Nagatsuta, Tokyo Inst Technol 4259 Nagatsuta Yokohama Kanagawa Japan tsuta,
Citazione:
T. Ohtani et al., "In-situ observation of hydrogenation of ethylene on a Pt(111) surface under atmospheric pressure by infrared reflection absorption spectroscopy", J PHYS CH B, 103(22), 1999, pp. 4562-4565

Abstract

Hydrogenation of ethylene on a Pt(111) surface in the presence of gaseous ethylene and hydrogen in the 10(3) Pa range was investigated by infrared reflection absorption spectroscopy (IRAS). The IRA peaks assigned to di-sigma-bonded ethylene and ethylidyne were observed on Pt(111) under the flow of 1.3 x 10(2) Pa of ethylene and 6.5 x 10(3) Pa of hydrogen at 200-300 K, andthe apparent activation energy of ethylene hydrogenation was estimated to be 37 +/- 5 kJ mol(-1) from the rate of temperature-dependent ethane production. The ethylene hydrogenation on ethylidyne-covered Pt(111) was also examined under the same condition. The peak due to the di-sigma-bonded ethylene was not observed on ethylidyne-covered Pt(111), although the similar rateof hydrogenation and the similar activation energy (39 +/- 5 kJ mol(-1)) were obtained as those on clean Pt(111). The pi-bonded ethylene, which has been previously proposed as an intermediate by the sum-frequency generation (SFG) experiment under the catalytic hydrogenation condition and by IRAS under the low-temperature condition, was not detected in the present study. The similarity of the rate and activation energy for clean and ethylidyne-covered Pt(111) surfaces suggests that-the rate of hydrogenation does not depend on either coverage of di-sigma-bonded ethylene or ethylidyne. The role of the observed species in the hydrogenation of ethylene is discussed.

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Documento generato il 25/09/20 alle ore 00:07:09