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By Françoise Rouquerol; J Rouquerol; K S W Sing

ISBN-10: 0080526012

ISBN-13: 9780080526010

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Extra info for Adsorption by powders and porous solids : principles, methodology, and applications

Example text

Thermodynamic potentials of adsorption . . . . . . . . . . . . . . Thermodynamic quantities related to the adsorbed states in the Gibbs representation . . . . . . . . . . . . . . . . . . . . . . . . . 1. Definitions of the molar surface excess quantities . . . . . . . . 2. Definitions of the differential surface excess quantities . . . . . . Thermodynamic quantities related to the adsorption process . . . . . . . 1. Definitions of the differential quantities of adsorption .

1986) Chem. & Ind. 360. M. W. (1987), J. Chromatogr. 406, 139. , Brotas de Carvalho M. W. (1989) Adsorption Sci. Tech. 6, 93. , Villieras F. and Yvon J. (1991) In: Characterization of Porous Solids H (F. Rodriguez-Reinoso, J. W. K. Unger, eds), Elsevier, Amsterdam, p. 591. , Maddox M. and Nicholson D. (1995) Accounts Chem. Res. 28, 281. H. (1991) Chemtech. 18. Deitz V. R. (1944) Bibliography of Solid Adsorbents, National Bureau of Standards, Washington DC. T. (1814) Gilbert's Ann. 47, 113. Dubinin M.

The Gibbs adsorption equation is a surface equation of state which indicates that, for any equilibrium pressure and temperature, the spreading pressure H is dependent on the surface excess concentration F. The value of spreading pressure, for any surface excess concentration, may be calculated from the adsorption isotherm drawn with the coordinates nip and p, by integration between the initial state (n = 0, p = 0) and an equilibrium state represented by one point on the isotherm. A mathematical difficulty arises in the evaluation of the integral in the region below the first experimental point (p First, the exact form of the adsorption isotherm is unknown in this range and secondly the ratio nip is indeterminate as p tends to zero.

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Adsorption by powders and porous solids : principles, methodology, and applications by Françoise Rouquerol; J Rouquerol; K S W Sing

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