Abstract
The competitive co-adsorption of CO and NO on the principal faces of Pt has been studied at 293K, as well as the Langmuir-Hinshelwood reaction between them which occurs when the surface is raised to higher temperatures. A variety of methods were used including LEED, Auger spectros copy, flash desorption, and surface potential measurements. Both gases adsorb nondissociatively at room temperature, and co-adsorb with a mutual perturbation of binding states. CO appears to displace NO with a rather high efficiency, and the kinetics of this process were studied. The surface reaction between 12CO and 14NO leads to products at 28, 32, and 44 AMU. This information is ambiguous because of certain obvious mass interferences; these interferences were completely resolved by experiments using 13CO and 15NO which showed that N2 and CO2 were the major products with N2O and O2 as minor products. Studying the product distribution as a function of relative reactant concentrations led to an overall mechanism which involves the thermal dissociation of NO as the first step.
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