Enhanced catalytic performance for volatile organic compound oxidation over in-situ growth of MnOx on CoO nanowire.

Hierarchical CoO@MnOx material has been synthesized by in-suit growth of MnOx on the CoO and applied in catalytic oxidation of volatile organic compounds (VOCs). Results revealed that T of acetone on the CoO@MnOx was 195 °C, which was 36 °C and 32 °C lower than that on the CoO and MnOx/CoO, respectively. The universality experiments demonstrated that T of ethyl acetate and toluene on the CoO@MnOx were 200 °C and 222 °C, respectively. The above results indicated that CoO@MnOx catalyst presented a robust catalytic performance. Characterization results showed that high catalytic activity of the CoO@MnOx catalyst could be attributed to the improvement of low temperature reducibility, the enhancement of Co and adsorbed oxygen species resulted from the sufficient reaction between MnO and Co during secondary hydrothermal process. Furthermore, stability and water-resistance experiments showed the CoO@MnOx catalyst with high cycle and long-term stability, satisfied endurability to 5.5-10 vol. % water vapor at 210 °C.