“…An early review by Russell and Epling has offered in-depth coverage in relation to the reaction models of HCs, NO, and CO oxidation over PGM-based DOCs and toward precious metal characteristics (oxidation state, particle size/dispersion, active site location) and O 2 variation, which we will not expand here . A common feature appeared for HCs, NO, and CO oxidation is that all proceed via interfacial or superficial reactions, where trapping of HCs, NO, and CO on metals serves as the precursor for total oxidation (which is secondary to C–H bond cleavage in the case of HCs). ,,− Those adsorbed molecules reacts with neighboring activated lattice oxygen (route i), oxygen adsorbed in the support vacancies (route ii), or oxygen species adsorbed on metals (route iii), as shown in Figure b.…”