Carbon monoxide adsorption on selected gold clusters: Highly size-dependent activity and saturation compositions

William T. Wallace, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

The carbon monoxide (CO) adsorption activity of small gold-cluster anions (AuN-, N = 4-19) has been measured by pulsed helium flow-reactor methods at room temperature. In contrast to other metals, the reaction-product distributions, AuN(CO)M = (N,M), measured over a range of CO partial pressure, reveal highly size-dependent adsorption activity and saturation. Preferred initial products include the (N,M) set {(5,1), (11,1), (15,1), (15,2)}, which can be explained by the gold electron (sub)shell fillings at 8, 14, 18, and 20 electrons, respectively, assuming CO acts as a two-electron donor. Pronounced saturation compositions include the complexes {(7,4), (9,6), (11,6), (13,6)}. The pressure-dependent adsorption patterns give insight into (CO,O2) coadsorption phenomena on model-catalyst systems, and may be exploited in further gas-phase experiments on coadsorption and catalytic cycles.

Original languageEnglish (US)
Pages (from-to)10964-10968
Number of pages5
JournalJournal of Physical Chemistry B
Volume104
Issue number47
DOIs
StatePublished - Nov 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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