Abstract
This paper will focus on the loss of activity which results from the exposure of supported metal catalysts to high temperatures, and in particular, on the mechanisms of nucleation and growth of the catalytically active metal particles. Attention will be confined primarily to the case of platinum particles supported on alumina substrates, as this has been the most widely studied system. However, the concepts discussed will be sufficiently general to provide insights into the behavior of related metal cluster systems. The following topics will be covered in some detail. a) The nucleation processes which lead to the formation of either metallic or oxidic particles. b) The phenomenon of “redispersion.” c) Mechanisms of growth and associated particle growth kinetics for particles supported on fiat substrates. d) Influence of substrate curvature on mechanisms of growth.
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