CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters

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

Research output: Contribution to journalArticle

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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

Fingerprint

Nanoclusters
Carbon Monoxide
polarization modulation
nanoclusters
infrared reflection
Absorption spectroscopy
dissociation
absorption spectroscopy
Modulation
Polarization
Infrared radiation
Adsorption
adsorption
Single crystal surfaces
crystal surfaces
flat surfaces
sintering
Sintering
Crystalline materials
Thin films

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.

CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters. / Ozensoy, E.; Min, Byoung Koun; Santra, A. K.; Goodman, D. W.

In: Journal of Physical Chemistry B, Vol. 108, No. 14, 08.04.2004, p. 4351-4357.

Research output: Contribution to journalArticle

Ozensoy, E, Min, BK, Santra, AK & Goodman, DW 2004, 'CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters', Journal of Physical Chemistry B, vol. 108, no. 14, pp. 4351-4357.
Ozensoy E, Min BK, Santra AK, Goodman DW. CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters. Journal of Physical Chemistry B. 2004 Apr 8;108(14):4351-4357.
Ozensoy, E. ; Min, Byoung Koun ; Santra, A. K. ; Goodman, D. W. / CO Dissociation at Elevated Pressures on Supported Pd Nanoclusters. In: Journal of Physical Chemistry B. 2004 ; Vol. 108, No. 14. pp. 4351-4357.
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