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isosteric enthalpy of adsorption

When the addition of the differential amount of component id 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
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: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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