(Hint In your working you should represent the total number of adsorption sites by N and provide expressions for both the rate of adsorption and the rate of desorption of CO.) The quantity bCO (= ka/kd) is the adsorption coefficient for CO and pCO is the partial pressure of CO. Where θCO and θO are the fractional surface coverages of CO and O, respectively. (i) For the competitive adsorption of CO show that the following expression can be derived by equating the rates of adsorption and desorption of CO: The rate-limiting step is then a bimolecular reaction between CO(ad) and O(ad):Ĭarbon dioxide can be assume to be weakly adsorbed and, as a consequence, desorbs as quickly as it is formed. Under certain conditions, the oxidation reaction was found to involve competitive adsorption of the reactants with CO being non-dissociatively adsorbed and oxygen undergoing dual-site adsorption:Įquation 3 ka’ O2(g) + 2* ↔ O(ad) + O(ad) kd’ A catalyst consisting of palladium on an α-Al2O3 support, Pd/α-Al2O3, has been used for the oxidation of CO at room temperature:
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