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In Situ Ambient Pressure XPS Study of CO Oxidation Reaction on Pd(111) Surfaces

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


Journal:
The Journal of Physical Chemistry C


Issue Date:
2012


Abstract(summary):

The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200-400 degrees 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 degrees C), while at higher temperatures (300-400 degrees 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.


Page:
18691-18697


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