Effect of Alloying on the Kinetics of Co + O2 and Co + No Reactions on Pt-Rh Nanocatalysts : A Theoretical Model

Surface Chemistry Reaction Model has been used to study the kinetics of CO + NO and CO + O 2 reactions on Pt-Rh nanocatalysts. For CO + O 2 reaction the alloy particles evince an intermediate behaviour; however, for the CO + NO reaction the alloy particles show no synergistic effect of alloying. The inherent rate of CO + O 2 reaction is much higher than that of CO + NO reaction on the Pt 5 0 Rh 5 0 nanoparticles. The kinetics of the CO + NO + O 2 and CO + NO reaction on the alloy particles are almost the same. NO inhibits formation of CO 2 molecules. The simulated results are in qualitative agreement with the experimental findings.