Abstract
Pd is deposited onto a model alumina surface in the presence of a
CO atmosphere of 3 × 10-6 mbar at liquid nitrogen temperatures.
According to the IR spectra the palladium carbonyl compound formed
contains weakly bound terminal and more strongly bound bridging CO
molecules, the spectra being similar to the IR spectra of colloidal
metal particles in solution and the IR spectra of CO adsorbed
on small deposited Pd particles. In line with thermal desorption
studies of the stability of the compound, the IR spectra reveal
the transition from the compound to a situation where CO is adsorbed
on larger compact metal aggregates upon heating to room temperature.
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