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V.—Thermodynamics of Adsorption

Published online by Cambridge University Press:  15 September 2014

A. M. Williams
A. M. Williams
Affiliation:
University of Edinburgh
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Summary

1. The adsorption of a gas has been investigated thermodynamically with special reference to the heat effects accompanying adsorption.

2. Expressions are developed for three isothermal heats of adsorption of a gas and for the heat of immersion of a powder in a liquid.

3. The effect of the variation of the surface of an adsorbent when adsorbing is examined, and it is shown from Titoff's observations (assuming, of course, the adsorption to be reversible) that the divergence between calculated and observed values of the heat of adsorption can be explained on the assumption of a change of surface area. The fractional change of surface per c.cm. adsorbed can be calculated, and also the surface energy per grm. adsorbent in vacuo.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 38 , 1919 , pp. 23 - 39
Copyright
Copyright © Royal Society of Edinburgh 1919

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References

page 23 note * Proc. Roy. Soc. Edin., vol. xxxvii, p. 161 (1917). Before this, Professor F. G. Donnan, F.R.S., and the author projected a thermodynamical paper on somewhat different lines from the present. The author acknowledges with pleasure his indebtedness to Professor Donnan.

page 25 note * Papers, vol. i, p. 235. For other methods of deriving the equation, see, among others, Milner, Phil. Mag. (1907) (vi), 13, p. 96; Ostwald, General Chemistry (1912), p. 499; and, more recently, Porter, Trans. Far. Soc. (1915), vol. xi, p. 51, and Harlow and Willows, Trans. Far. Soc., p. 53.

page 29 note * Following Donnan in an unpublished paper.

page 31 note * P. 108 et sequitur. See also Partington, Thermodynamics, p. 444.

page 31 note † Zeits. f. physik. Chem., lxxiv, p. 641 (1910).

page 33 note * Apparently at the lowest temperature of observation, −80° C., the charcoal was not allowed time to saturate itself.

page 38 note * Taylor, Chemistry of Colloids, p. 142.

page 33 note † Cf. Donnan's negative surface tension of colloids.