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An investigation has been made of some characteristics of hysteresis in the pbysical adsorption of nitrogen on bone char, activated carbon, silica gel, and coconut-shell charcoal at 77.40 K. It was found that hysteresis became less pronounced in the order given, occurring only slightly in coconut-shell charcoal and only from high relative pressures in the pressure range in which the Langmuir equation was not obeyed. It was shown that it was highly probable that a true steady state was attained in the pressure determinations and that the time dependency of adsorptioll and desorption are compatible with the requirements of diffusion processes. In this paper the theories of hysteresis are reviewed 011 the basis of capillary condensation, and an alternative interpretation is suggested in terms of the theory of multimolecular adsorption.

Hysteresis in the physical adsorption of nitrogen on bone char and other adsorbents