The values for the 1-dimensional (1-D) descriptor component (1 4 d ) evaluated for each material and reaction, shown in Fig. , further highlights that the descriptor correctly captures the performance across materials. In particular, the descriptor distinguishes the most active catalysts (MoVOx, MoVTeNbOx, SmMnO3, MnWO4) from the remaining ones. Moreover, the reactivity trend across reactions is also well described. The fact that SmMnO3 is more active than MoVOx (in red and grey, in Fig. ) only for the case of n-butane oxidation, for instance, is captured. Because the 8 9:;9<# ()((* model is based on the same descriptor 1 4 d for all temperatures and reactions, it can be written as The expression for the alkane-conversion descriptor 1 4 d , displayed in eq. 2 of Table , reveals the key primary features correlated with the alkane conversion: the per-mass reversible oxygen uptake of the fresh catalyst (a b,$" * F ), the carbon surface contents of the fresh catalyst under UHV (L M,$" D ), the RAE surface content of the fresh catalyst under UHV and of the activated catalyst under wet feed (L M,$"