Abstract
The surface reactivity of highly dispersed (85%) palladium cluster catalysts supported on γ-alumina (1.5 wt% loading) had been probed using the molecular beam scattering technique. This work illustrates the utility of molecular beam sources to study reaction kinetics on highly dispersed catalyst surfaces under UHV conditions. While CO adsorbs and desorbs molecularly throughout the coverage range, the Pd particles have been found to be extremely active with respect to NO dissociation forming a “mixed” layer of molecularly bound NO and atomic nitrogen and oxygen. Reaction kinetics of CO oxidation has been studied as a function of surface temperature by reaction of a pre-adsorbed oxygen layer with a CO molecular beam. A maximum reaction rate and percentage conversion to CO 2 was found to occur between 570 and 620 K. In contrast to previous studies of model Pd cluster catalysts, the highly dispersed Pd clusters have been found to be active for the CO/NO reaction probed by reaction of a CO beam with a NO pre-adsorbed layer.
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