Abstract
Abstract The interrupted temperature-programmed desorption of carbon monoxide was used to characterize the surface heterogeneity of supported platinum catalysts. The surface of platinum particles is divided into two different groups of desorption sites. For one group, the surface diffusion of carbon monoxide takes place easily, and it desorbs at low temperatures. For the other, the desorption of carbon monoxide requires higher temperatures, and surface diffusion does not occur. For the latter group, the distribution of the activation energy of desorption is determined by a method that the authors have recently developed (Appl. Surf. Sci., 89, 11 (1995)).
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