M interstitial cation of MG

This reaction starts from the weakly adsorbed G gas and the M ions in interstitial positions in MG. It refers to reaction [2.R.12] written from right to left. It also involves two jumps and therefore two elementary steps. 

If 6 is the fraction of adsorbed sites, Fq the volume of the adsorbed phase, and 1-9 the recovered fraction, the voluminal speed of this elementary step can be written as (defects being diluted)  

The voluminal speed of this elementary step can be written as  

The voluminal speed of this reaction is expressed in the form v = k [M ]q-K l-q) 

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