Enhanced catalytic performance for volatile organic compound oxidation over in-situ growth of MnOx on Co 3 O 4 nanowire.

Hierarchical Co ₃ O ₄ @MnOx material has been synthesized by in-suit growth of MnOx on the Co ₃ O ₄ and applied in catalytic oxidation of volatile organic compounds (VOCs). Results revealed that T ₉₀ of acetone on the Co ₃ O ₄ @MnOx was 195 °C, which was 36 °C and 32 °C lower than that on the Co ₃ O ₄ and MnOx/Co ₃ O ₄ , respectively. The universality experiments demonstrated that T ₉₀ of ethyl acetate and toluene on the Co ₃ O ₄ @MnOx were 200 °C and 222 °C, respectively. The above results indicated that Co ₃ O ₄ @MnOx catalyst presented a robust catalytic performance. Characterization results showed that high catalytic activity of the Co ₃ O ₄ @MnOx catalyst could be attributed to the improvement of low temperature reducibility, the enhancement of Co ³⁺ and adsorbed oxygen species resulted from the sufficient reaction between MnO ₄ ^- and Co ²⁺ during secondary hydrothermal process. Furthermore, stability and water-resistance experiments showed the Co ₃ O ₄ @MnOx catalyst with high cycle and long-term stability, satisfied endurability to 5.5-10 vol. % water vapor at 210 °C.
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