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

By Françoise Rouquerol; J Rouquerol; K S W Sing

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Mo1-1 70 ...... , 60. n-Alkanes ,~ n-Alkanes 50 ~ Alkenes 40 x Aromatic , j jx 30. 5. 'Zero' coverage energy of adsorption versus carbon number, Nc, on graphitized carbon, nAlkanes, after Avgul and Kiselev (1965) and Carrott and Sing (1987); alkenes, after Carrott et al. (1989); aromatic, after Avgul and Kiselev (1965). when the Esp contribution becomes significant that the polarity of the adsorptive molecule is important. 5 illustrate this behaviour. Here E 0 is measured from the enthalpy of adsorption, [A ads/~0] (determined by the chromatographic method at very low surface coverage, as explained in Chapter 3).

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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 . . . . . .

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