Abstract
The catalytic effect of platinum on the oxidation of graphite has been examined for 1 wt% Pt-graphimet with the use of temperature programmed desorption technique. Analyses of results show that the addition of platinum particles enhances the overall rate of carbon oxides evolution by increasing the active surface area, with little or no change in the apparent activation energy of desorption. This is attributed to the scission of carbon-carbon bonds by platinum. Results of the mathematical modelling based on controlled atmosphere electron microscopy studies by Baker and his co-workers seem to suggest the existence of a viscous oxide layer and surface diffusion on the metal surface and a possibility that both electron and oxygen transfer mechanisms are operating in the carbon-oxygen reactions catalysed by platinum group metals.
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