Manganese-promoted cobalt oxide as efficient and stable non-noble metal catalyst for preferential oxidation of CO in H2 stream

▶ Modification by MnOx enhanced catalytic performances of Co3O4 for CO-PROX in H2. ▶ MnOx-Co3O4 showed higher activity, selectivity and stability in CO-PROX at ∼100 ̊C. ▶ MnOx modification increased the amounts of reactive oxygen species and adsorbed CO. ▶ Presence of MnOx accelerated the regeneration ability of the reduced catalyst by O2.