Reactions on Nonuniform Nonideal Surfaces

Real surfaces are known to be nonuniform, so two obvious questions are the following. Can rate expressions for catalytic reactions on nonuniform surfaces be meaningfully and readily derived If so, do these rate laws more accurately describe the experimental results obtained with real catalysts The previous chapter was devoted to modeling reactions occurring on a uniform or ideal surface in the Langmurian sense, and the reasons for the validity and success of this approach were cited. The paradox of this successful application of Langmurian types of rate laws to nonideal surfaces was addressed in Chapter 6.5, and the earliest rationale for this observation is still the best explanation, i.e., the reaction proceeding on the most active sites, which may constitute but a small fraction of the total number of sites, dominates the macroscopic kinetic behavior. 

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The treatment based on the two-step sequence for nonideal surfaces originates from the complexity of deriving the expHcit form of rate equations for other reaction mechanisms on biographical nonuniform surfaces. At the same time, models based on lateral interactions have no restrictions from this point of view, as the impHcit form can be and is used for the data fitting. At the same time, it should be noted that there are certain numerical challenges related to kinetic modehng on induced nonuniform surfaces with lateral interactions. 

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