CATALYTIC OXIDATION OF CO ON Rh/SiO2: A RAPID-RESPONSE FOURIER TRANSFORM INFRARED TRANSIENT STUDY.

Article abstract of DOI:10.1021/j100317a043

The catalytic oxidation of CO has been studied over Rh/SiO//2 by using a rapid transient response FTIR-mass spectrometric technique. The reactivity of linearly adsorbed CO was found to be considerably greater than that of the dicarbonyl species at both 85 and 200 degree C. The frequency of linearly adsorbed CO was observed to undergo a continuous red shift during the duration of the transient, suggesting the formation of a mixed CO-oxygen adlayer. Induction times required for the formation of gas-phase CO//2 were found to be nearly 2 orders of magnitude lower than those observed for Pt/SiO//2 and Pd/SiO//2. Self-sustained CO-O//2 oscillations reinforce the greater reactivity of linearly adsorbed CO. H//2-CO-O//2 transient studies also suggest the formation of mixed hydrogen-CO adlayers.