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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.

N: total number of adsorption sites n: number of occupied sites. At equilibrium: kAP (N - n) = kDn (9.19) the equilibrium constant, Keq =kA/kD RT H p N n n Keq 0 exp ( ) = − = (9.20) H°: heat of adsorption at temperature T and standard pressure, PST The fraction of the adsorption sites occupied, q, is N n q = (9.21) Eq.

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