脉冲放电协同负载型氧化物催化剂降解甲醛

以γ-Al2O3为载体,分别负载Cu、Mn和Ti 3种不同活性成分制备了CuO/γ-Al2O3、MnO2/γ-Al2O3和TiO2/γ-Al2O3催化剂,采用SEM、XRD和EDS等技术对催化剂进行了表征分析。在脉冲放电反应体系中放置所制备的催化剂对甲醛进行降解研究,了解催化剂催化性能,及其与脉冲放电的协同效应。实验结果表明,负载型催化剂与脉冲放电具有协同作用,能明显提高甲醛的降解率,且MnO2/γ-Al2O3与脉冲放电的协同效果明显好于CuO/γ-Al2O3、TiO2/γ-Al2O3。MnO2/γ-Al2O3催化剂中Mn的负载量、制备时的焙烧温度对催化剂的活性有明显影响,当Mn负载量为8%、焙烧温度为300℃时,制备的MnO2/γ-Al2O3催化剂性能最佳,在脉冲电压为24 kV,脉冲频率为40 Hz的条件下,甲醛去除率为97%。最后,对脉冲放电协同MnO2/γ-Al2O3催化剂降解甲醛的机理进行了探讨。

Degradation of formaldehyde by pulse discharge combined with supported oxide catalyst

CuO/γ-Al2O3,MnO2/γ-Al2O3 and TiO2/γ-Al2O3 catalysts were prepared by three different kinds of active ingredients including Cu,Mn and Ti respectively supporting on the γ-Al2O3 carrier,and the catalysts were characterized by SEM,XRD and EDS.The prepared catalysts were applied to research on degradation of formaldehyde in the pulse discharge reaction system,and to understand the catalytic performance and the synergistic effect between catalyst and pulse discharge by this research.The experimental results showed that supported catalyst with the pulse discharge had a synergistic effect,could significantly improve the degradation rate of formaldehyde,and MnO2/γ-Al2O3 had a better performance than CuO/γ-Al2O3 and TiO2/γ-Al2O3 in synergistic effect with pulse discharge.The loading amount of Mn and calcination temperature during the preparation of MnO2/r-Al2O3 catalyst had obvious effect on catalyst activity.When Mn content was 8%,the calcination temperature was 300℃,MnO2/r-Al2O3 catalyst showed the best performance,and when the pulse discharge voltage was 24 kV,pulse discharge frequency was 40 Hz,the removal rate of formaldehyde reached 97%.Finally,the mechanism of degradation of formaldehyde by pulse discharge combined with MnO2/γ-Al2O3 catalyst was discussed.