Also, the formation of C3 from PP indicates appreciable C-C bond cleavage through type-B β-scissions. Both observations suggest that on Ru/TiO2-A-SG, the alkane dehydrogenation step is not equilibrated (see the Discussions section for detailed mechanistic explanations), which is not surprising with the low metal loading. In this situation, the consumption of dehydrogenated intermediates on Ru (in the purple box in Scheme 1) through hydrogenolysis, i.e., C-C bond cleavage, reduces the amount of them desorbing as alkenes. The faster hydrogenolysis at higher PH2 thus decreases free alkene concentrations in the system, suppressing hydrocracking.