CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters

E. Ozensoy, Byoung Koun Min, A. K. Santra, D. W. Goodman

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Abstract

In-situ polarization modulation infrared reflection absorption spectroscopy (PM-IRAS) is used to study CO adsorption at elevated pressures and temperatures on Pd nanoclusters deposited on crystalline SiO 2 thin films. The PM-IRAS data indicate that CO dissociates on the Pd nanoclusters at 185 mbar and at temperature >600 K. Combined STM and PM-IRAS data show that the Pd nanoclusters are three-dimensional and consist predominantly of 〈111〉 facets with an average diameter and height of 3.5 and 0.7 nm, respectively. STM data indicate no change in the morphology or sintering of the Pd nanoclusters between 300 and 650 K. For comparison, CO adsorption was investigated on a Pd(111) single-crystal surface using PM-IRAS under similar conditions (P CO = 133 mbar, T = 175-750 K). Comparison of the PM-IRAS data for CO adsorption on Pd(111) and Pd nanoclusters indicate that in contrast to the Pd nanoclusters, CO adsorbs molecularly on the Pd(111) surface in a reversible manner, i.e., no dissociation.

Original languageEnglish
Pages (from-to)4351-4357
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number14
Publication statusPublished - 2004 Apr 8
Externally publishedYes

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Ozensoy, E., Min, B. K., Santra, A. K., & Goodman, D. W. (2004). CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters. Journal of Physical Chemistry B, 108(14), 4351-4357.