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Very Low Rate Constants of Bimolecular CO Adsorbtion on Anionic Gold Clusters: Implications for Catalytic Activity

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: I. Balteanu, O. P. Balaj, B. S. Fox, M. K. Beyer, Z. Bastl, and V. E. Bondybey

Editorial: Phys. Chem. Chem. Phys., 5, p.1213-1218, 2003.

Rezumat:

Absolute bimolecular rate constants for radiative stabilization of CO on gold cluster anions are measured by Fourier-transform ion cyclotron resonance (FT-ICR) mass spectrometry, employing a sequence of reaction gas pulses to acquire sufficient product intensities of these exceedingly inefficient reactions. While some of the observed reactivity patterns seem to be in agreement with the jellium model if CO is viewed as a two electron donor, it cannot provide an explanation for some other observations, for instance for the secondary reactions of Au10– and Au11–. Interesting cooperative effects are observed in conjunction with O2, which is present as a trace component of the reaction gas. No evidence is found for catalytic CO2 formation on the clusters.

Cuvinte cheie: gold clusters, reactivity patterns, gas-phase rections