In situ photoemission observation of catalytic CO oxidation reaction on Pd(110) under near-ambient pressure conditions: Evidence for the Langmuir-Hinshelwood mechanism

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

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Abstract

CO oxidation reaction on a Pd(110) single crystal surface at various temperatures under near-ambient-pressure conditions has been investigated using in situ X-ray photoemission spectroscopy and mass spectroscopy. At lower temperature conditions, the CO2 formation rate is low, where the surface is covered by CO molecules (i.e., CO poisoning). Above a critical temperature 165 C the Pd(110) surface converts to a catalytically active surface and is dominated by chemisorbed oxygen species. Further at the higher temperatures up to 320 C, the CO2 formation rate is gradually decreased to about 80% of the maximum rate. At this moment, the amount of chemisorbed O was also decreased, which suggests that the CO oxidation reaction proceeds via the conventional Langmuir-Hinshelwood mechanism even under near-ambient pressure conditions.

Original languageEnglish
Pages (from-to)20617-20624
Number of pages8
JournalJournal of Physical Chemistry C
Volume117
Issue number40
DOIs
Publication statusPublished - 2013 Oct 10

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ASJC Scopus subject areas

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

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