isosteric enthalpy of adsorption

When the addition of the differential amount of component $i$ $d n i σ$ or $d n i s$ is effected at constant pressure $p$ , the differential molar enthalpy of adsorption, $Δ a H i σ$ or $Δ a H i s$ also called the isosteric enthalpy of adsorption ( $q st$ ) is defined as:

$Δ a H i σ = − q st , σ = U i σ − H i g$

$Δ a H i s = − q st , σ = H i σ − H i g$

where $H i s = ( ∂ H s ∂ n i s ) T , p , m , n j s$ and $H i g$ is the partial molar enthalpy of component $i$ in the gas phase, i.e. $( ∂ H g ∂ n i g ) T , p , n i g$

Source:

PAC, 1972, 31, 577 (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 603

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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.I03313.

Original PDF version: http://www.iupac.org/goldbook/I03313.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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