In this expression, 𝑢 l,bC f m is the reversible oxygen uptake of the fresh catalyst per mass, and 𝑥 e,CnF,g$ f is the O surface content under reaction C3-rich feed. 𝑢 e,bC f m indicates the materials ability to reversibly incorporate oxygen on its bulk structure and is related, for instance, to the role of lattice oxygen. 𝑊 CnF,oGN and 𝑥 e,CnF,g$ f , in turn, are related to surface processes. While the 𝑐 :