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 |
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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 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films