In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces

Ryo Toyoshima; Masaaki Yoshida; Yuji Monya; Yuka Kousa; Kazuma Suzuki; Hitoshi Abe; Bongjin Simon Mun; Kazuhiko Mase; Kenta Amemiya; Hiroshi Kondoh

doi:10.1021/jp301636u

In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces

Ryo Toyoshima, Masaaki Yoshida, Yuji Monya, Yuka Kousa, Kazuma Suzuki, Hitoshi Abe, Bongjin Simon Mun, Kazuhiko Mase, Kenta Amemiya, Hiroshi Kondoh

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

122 Citations (Scopus)

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	https://doi.org/10.1021/jp301636u
Publication status	Published - 2012 Sep 6

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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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.",

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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.

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In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces

Abstract

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