Article | REF: AF3680 V1

Surface of solids. Physisorption - Chemisorption - Segregation

Authors: Didier ROUXEL, Bernard WEBER

Publication date: July 10, 2009, Review date: February 10, 2015

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7. Adsorption and desorption kinetics

7.1 Adsorption rate. Shock efficiency. Quantity adsorbed

The maximum rate of adsorption at a gas-solid interface is the rate at which gas molecules collide with the surface. According to the kinetic theory of gases, the number Z of molecular collisions per unit area and time, or shock frequency, is given by the Hertz-Knudsen relation:

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Adsorption and desorption kinetics