LAUSR

A series of MnOx modified cobalt oxides with different atomic molar ratios of Mn/(Mn + Co) were prepared by a soft reactive grinding route and investigated for CO preferential oxidation in H2. It was found that as-prepared Mn-doped cobalt oxides exhibited superior activity compared to the single constituted oxides, other Mn–Co–O mixed oxides synthesized by solution-based route, and other grinding-derived mixed metal oxides M–Co–O (M = Zn, Ni, Cu, Fe). The grinding-derived MnCo10 catalyst with Mn/(Mn + Co) molar ration of 10% showed the best CO oxidation activity and higher selectivity at low temperature. The surface richness of Co3+ was not found as increasing the Mn molar ratio in the present work. However, the incoporation of MnOx with proper amount into Co3O4 could produce high surface area, high structure defects, and rich surface active oxygen species, while the ability to supply the active oxygen species was suggested to play the crucial role in promoting the catalytic performance of Mn–Co–O mixed oxides.