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By Françoise Rouquerol; J Rouquerol; K S W Sing

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

Sample text

Enthalpies in kJ mol -~ of adsorption at low coverage for n-hexane and benzene on graphitized carbon, silica (hydroxylated, dehydroxylated and modified), and barium sulfate Adsorbent n-Hexane Benzene 42 46 48 29 47 42 55 38 34 70 Graphitized carbon black Hydroxylated silica Dehydroxylated silica Trimethylsilylated silica Barium sulfate Reference Avgul and Kiselev (1965) Kiselev (1965) Kiselev (1965) Kiselev (1967) Belyakova et al. (1970) has resulted in a m u c h greater effect. In this case the w e a k e n i n g of the a d s o r b e n t adsorbate interactions is mainly due to the fact that the surface modification has resulted in a reduction in the density of the force centres.

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 . . . . . . 2. Definitions of the integral molar quantities of adsorption . . . . . 3. Advantages and limitations of differential and integral molar quantities of adsorption .

Integral molar entropy of adsorption . . . . . . . . . . . . . Indirect derivation of the quantities of adsorption from of a series of experimental physisorption isotherms: the isosteric method . . . . . . . 1. Differential quantities of adsorption . . . . . . . . . . . . . . 2. Integral molar quantities of adsorption . . . . . . . . . . . . Derivation of the adsorption quantities from calorimetric data . . . . . . 1. Discontinuous procedure .

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