Gas-solid interphases adsorption, desorption

Adsorption and desorption processes are the reverse of each other and are always considered as occurring, whatever the nature of the solid and gas. During chemical transformations there is chemisorption. When this double process occurs as steps of a reaction mechanism, the Langmuir mechanism is satisfied. 

Using the calcirlated energies, we plot every equipotential cirrve in the axis system chosen (see Figttre 11.5). Starting fiom the initial state of the gas molecirle 

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