The effect of aggregation on colloid catalysts: A fractal model

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Abstract
Theoretical models for the effect of aggregation on the catalytic properties of metal colloids are developed within the framework of the electrochemical theory of the catalytic mechanism and recently proposed models for the extremes of cluster aggregation. In the case of fast aggregation of the colloid catalyst, the catalytic rate is, in general, predicted to decrease as a power law of time. In the case of slow aggregationcatalytic rates are predicted to have an exponential decrease with time. Polydispersity could be important in the case of slow aggregations. A recent experiment on aggregating colloidalsilver is discussed.