Enhanced Acetone Oxidation over the CeO₂/Co₃O₄ Catalyst Derived from Metal–Organic Frameworks

Abstract

A novel CeO₂/Co₃O₄ catalyst with a high catalytic activity has been designed and prepared by pyrolysis of metal-organic frameworks, and its catalytic performance was evaluated by the acetone catalytic oxidation reaction. The Co₃O₄-M catalyst with <i>T</i>₉₀ at 194 °C was prepared by pyrolysis of the MOF-71 precursor, which was 56 °C lower than that of commercial Co₃O₄ (250 °C). By the addition of cerium to the MOF-71 precursor, an enhanced CeO₂/Co₃O₄ catalyst with <i>T</i>₉₀ at 180 °C was prepared. Importantly, the CeO₂/Co₃O₄ catalyst exhibited superior stability for acetone oxidation. After 10 cycle tests, the conversion could also be maintained at 97% for at least 100 h with slight activity loss. Characterization studies were used to investigate the influence of cerium doping on the property of the catalyst. The results showed that addition of cerium could facilitate the expansion of the surface area and enhance the porous structure and reducibility at low temperature. Furthermore, the surface ratio of Co³⁺/Co²⁺ and mobile oxygen obviously improved with the addition of cerium. Therefore, the metal oxides prepared by this method have potential for the elimination of acetone.