Oxidation of CO by O2, NO, and Mixtures of O2 and NO over Pd(100)

Article abstract of DOI:10.1021/j100123a001

The rate of CO2 formation in each of the three reactant mixtures, CO + O2, CO + NO, and CO + O2 + NO, was measured over Pd(100) at partial pressures of 1 Torr and temperatures in the range 430 - 580 K.The rate in both CO + O2 and CO + NO followed the Arrhenius behaviour; in CO + NO, the rate was about 2 orders of magnitude lower than in CO + O2, whereas the apparent activation energy was about 30percent lower.The rate in CO + O2 + NO, however, was the same as in CO + O2 at temperatures above 480 K and was even greater at temperatures below 480 K.This behaviour may be contrasted with that in the case of Rh, where the addition of NO to CO + O2 drastically reduces the rate of CO2 formation.