Abstract
The catalytic reduction of NO and CO on a Pd (poly) surface has been studied in 300–900 K with thermal programmed desorption and molecular beam relaxation spectrometry methods. Under several ratios of PNO to PCO, the reaction products were CO2, N2, and a bit of N2O. Analysis of data in different temperature regions concludes that the reaction between NO and CO is a true bimolecular reaction rather than unimolecular NO decomposition with CO scavenging of adsorbed oxygen. Best fits to the rate constant parameters characterizing this reaction are given. The activation energies of CO for desorption and of this reaction are Edco= 134.0 and Ebi = 88.4 kJ/mol, respectively. The effects of ratio of PNO to PCO in mixture and coverage of adsorbate are discussed.
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