Abstract
The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200-400 °C) under hundreds mTorr pressure conditions has been monitored by in situ ambient pressure X-ray photoelectron spectroscopy and mass spectroscopy. In situ observation of the reaction revealed that the Pd(111) surface is covered by CO molecules at a lower temperature (200 °C), while at higher temperatures (300-400 °C) several oxide phases are formed on the surface. We found that the reactivity is enhanced in the presence of a surface oxide and significantly suppressed by formation of a cluster oxide and the PdO bulk oxide. CO titration experiments suggest that less coordinated oxygen atoms are more reactive for CO oxidation.
| Original language | English |
|---|---|
| Pages (from-to) | 18691-18697 |
| Number of pages | 7 |
| Journal | Journal of Physical Chemistry C |
| Volume | 116 |
| Issue number | 35 |
| DOIs | |
| Publication status | Published - 2012 Sep 6 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Energy(all)
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In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces. / Toyoshima, Ryo; Yoshida, Masaaki; Monya, Yuji; Kousa, Yuka; Suzuki, Kazuma; Abe, Hitoshi; Mun, Bongjin Simon; Mase, Kazuhiko; Amemiya, Kenta; Kondoh, Hiroshi.
In: Journal of Physical Chemistry C, Vol. 116, No. 35, 06.09.2012, p. 18691-18697.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces
AU - Toyoshima, Ryo
AU - Yoshida, Masaaki
AU - Monya, Yuji
AU - Kousa, Yuka
AU - Suzuki, Kazuma
AU - Abe, Hitoshi
AU - Mun, Bongjin Simon
AU - Mase, Kazuhiko
AU - Amemiya, Kenta
AU - Kondoh, Hiroshi
PY - 2012/9/6
Y1 - 2012/9/6
N2 - The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200-400 °C) under hundreds mTorr pressure conditions has been monitored by in situ ambient pressure X-ray photoelectron spectroscopy and mass spectroscopy. In situ observation of the reaction revealed that the Pd(111) surface is covered by CO molecules at a lower temperature (200 °C), while at higher temperatures (300-400 °C) several oxide phases are formed on the surface. We found that the reactivity is enhanced in the presence of a surface oxide and significantly suppressed by formation of a cluster oxide and the PdO bulk oxide. CO titration experiments suggest that less coordinated oxygen atoms are more reactive for CO oxidation.
AB - The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200-400 °C) under hundreds mTorr pressure conditions has been monitored by in situ ambient pressure X-ray photoelectron spectroscopy and mass spectroscopy. In situ observation of the reaction revealed that the Pd(111) surface is covered by CO molecules at a lower temperature (200 °C), while at higher temperatures (300-400 °C) several oxide phases are formed on the surface. We found that the reactivity is enhanced in the presence of a surface oxide and significantly suppressed by formation of a cluster oxide and the PdO bulk oxide. CO titration experiments suggest that less coordinated oxygen atoms are more reactive for CO oxidation.
UR - http://www.scopus.com/inward/record.url?scp=84865955576&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84865955576&partnerID=8YFLogxK
U2 - 10.1021/jp301636u
DO - 10.1021/jp301636u
M3 - Article
AN - SCOPUS:84865955576
VL - 116
SP - 18691
EP - 18697
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 35
ER -