Solid-State Construction of CuO x /Cu 1.5 Mn 1.5 O 4 Nanocomposite with Abundant Surface CuO x Species and Oxygen Vacancies to Promote CO Oxidation Activity.

Carbon monoxide (CO) oxidation performance heavily depends on the surface-active species and the oxygen vacancies of nanocomposites. Herein, the CuO x /Cu 1.5 Mn 1.5 O 4 were fabricated via solid-state strategy. It is manifested that the construction of CuO x /Cu 1.5 Mn 1.5 O 4 nanocomposite can produce abundant surface CuO x species and a number of oxygen vacancies, resulting in substantially enhanced CO oxidation activity. The CO is completely converted to carbon dioxide (CO 2 ) at 75 °C when CuO x /Cu 1.5 Mn 1.5 O 4 nanocomposites were involved, which is higher than individual CuO x , MnO x, and Cu 1.5 Mn 1.5 O 4 . Density function theory (DFT) calculations suggest that CO and O 2 are adsorbed on CuO x /Cu 1.5 Mn 1.5 O 4 surface with relatively optimal adsorption energy, which is more beneficial for CO oxidation activity. This work presents an effective way to prepare heterogeneous metal oxides with promising application in catalysis.