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Chapter 9 Adsorption

1 Chapter 9 Adsorption Introduction Adsorption : (i) the principle ways in which high-energy interfaces lower the overall energy of a system. (ii) A complex process which is different to be described precisely by theoretical model. Definition of Adsorption : Preferential concentration of one component of a system at an interface, where the local concentration is different from those in the bulk phase. (i) positive Adsorption : interfacial concentration of the adsorbed species is greater than that in the bulk phase. - decrease the interfacial energy.

function of gas pressure (P) at a constant temperature Isobar: V v.s. T at constant P Isosteres: P v.s. T at constant V (used to determine ΔHad using the Clausius-Clapeyron Eq.) 9.3.1. Classification of Adsorption Isotherm The phenomena involved in the process that should be considered in an adsorption model: (a).

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