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

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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.

Original languageEnglish
Pages (from-to)18691-18697
Number of pages7
JournalJournal of Physical Chemistry C
Volume116
Issue number35
DOIs
Publication statusPublished - 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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    Toyoshima, R., Yoshida, M., Monya, Y., Kousa, Y., Suzuki, K., Abe, H., Mun, B. S., Mase, K., Amemiya, K., & Kondoh, H. (2012). In situ ambient pressure XPS study of CO oxidation reaction on Pd(111) surfaces. Journal of Physical Chemistry C, 116(35), 18691-18697. https://doi.org/10.1021/jp301636u