Abstract
The kinetics of interaction of Saran carbon with molecular O 2 has been investigated, principally by a thermogravimetric technique and from 2 to 35 Torr oxygen pressure. The results are examined in terms of various sorption and oxidation models. The sorption kinetic results indicate that surface diffusion of O 2 is the predominant rate controlling process, with the saturation sorption level governed by the availability of non localized species, possibly conduction electrons. The oxidation kinetics can also be interpreted on the basis of a model involving surface diffusion along with a first order surface reaction and a Langmuir isotherm applying to the adsorbed oxygen. Such a model requires that the oxygen initially be adsorbed reversibly, thence diffusing to special sites where it becomes irreversibly adsorbed. Evidence for such a two-stage adsorption process is available in the literature.
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