Diffusion and flow of gases and vapours through micropores II. Surface flow

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Abstract
Flow through porous plugs has been measured under conditions where surface flow of adsorbed gases makes an important contribution. An analysis of variables affecting surface flow enables surface diffusion coefficients to be calculated and has indicated conditions likely to reduce the correction for flow in the gaseous phase to small proportions. This has been confirmed by studying the effect of variations of porosity. Surface diffusion coefficients tend to increase with ‘coverage' of the adsorbent surface. This requires further study. Activation energies measured for one system were found to be rather small. Owing to the variation of surface diffusion coefficients with coverage, it proved difficult to obtain accurate values. Activation energies indicated a tendency to decrease as coverage increases. Further experiments on these points are also being carried out.

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