Active surface oxygen for catalytic CO oxidation on Pd(100) proceeding under near ambient pressure conditions

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

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Abstract

Catalytic CO oxidation reaction on a Pd(100) single-crystal surface under several hundred mTorr pressure conditions has been studied by ambient pressure X-ray photoelectron spectroscopy and mass spectroscopy. In-situ observation of the reaction reveals that two reaction pathways switch over alternatively depending on the surface temperature. At lower temperatures, the Pd(100) surface is covered by CO molecules and the CO 2 formation rate is low, indicating CO poisoning. At higher temperatures above 190 °C, an O-Pd-O trilayer surface oxide phase is formed on the surface and the CO 2 formation rate drastically increases. It is likely that the enhanced rate of CO 2 formation is associated with an active oxygen species that is located at the surface of the trilayer oxide.

Original languageEnglish
Pages (from-to)3182-3187
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume3
Issue number21
DOIs
Publication statusPublished - 2012 Nov 1

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ASJC Scopus subject areas

  • Materials Science(all)

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