By Françoise Rouquerol; J Rouquerol; K S W Sing
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Extra info for Adsorption by powders and porous solids : principles, methodology, and applications
There are a few adsorbents which give rise to essentially non-specific interactions with a wide range of different adsorptives. The most important non-porous adsorbent of this type is graphitized carbon black, which in its most uniform state has a surface structure composed almost entirely of the graphitic basal planes. When a polar molecule is adsorbed on this surface, Ens is much larger than Esp, which is unlikely to contribute more than 10% to the total interaction energy. In the case of graphite, the Esp contribution is largely due to the polarization component arising from the interaction between a polar adsorptive molecule and the induced dipoles in the graphite lattice.
McBain J. W. (1909) Phil. , 18, 916. Nicholson D. (1996) J. Chem. , Faraday Trans. 92, 1. Nicholson D. M. V. ), Elsevier, Amsterdam, pp. 76-77. Overbeek J. Th. G. H. H. Ottewill, eds), Butterworths, London, p. 3. Polanyi M. (1914) Verb. Deutsch Phys. , 16, 1012. S. (1822) Ann. Chim. , 20, 141. , Hailer G. V. V. ) Elsevier, Amsterdam, p. 203. , Pisani, C. and Garrone, E. (1971) In: Adsorption-Desorption Phenomena, Academic Press, London, p. 111. K. (1932) In: The Adsorption of Gases by Solids, Disc.
In the case of a single adsorptive, the adsorbed state may be regarded as a one-component phase, which has lost one degree of freedom. 18) indicates that it is sufficient to specify two of the variables 34 ADSORPTION BY POWDERS AND POROUS SOLIDS which characterize the gaseous adsorptive in order to define the adsorbed state for a particular adsorption system. In the measurement of the adsorption isotherm, F =f(P)r,a, the variables T and A are held constant. 20), then it is necessary to find another adsorption potential.