铜锰复合氧化物低温催化氧化甲醛的性能研究

发布时间：2018-06-10 05:37

  本文选题：氧化锰 + 铜锰复合氧化物　； 参考：《科技导报》2017年23期

【摘要】：采用简单的氧化还原方法,通过控制Cu和Mn物质的量之比及煅烧温度等条件合成了一系列铜锰复合氧化物。通过考察合成条件对催化剂的晶相、形貌以及催化活性的影响,从而确定最佳的工艺条件,结合X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等多种表征手段揭示催化剂结构和活性的关系。研究结果表明,在单一锰氧化物中,铜的掺杂促进氧物种移动,使得铜锰复合氧化物具有较低的还原温度和较强氧化还原能力,且结晶度差的无定型态同样有利于氧空穴的增加,从而有利于甲醛的催化氧化。当Cu/Mn物质的量之比为1∶2、煅烧温度为300℃时制得的铜锰复合催化剂催化性能最佳,能够在90℃下完全降解甲醛。
[Abstract]:A series of Cu-Mn complex oxides were synthesized by controlling the ratio of Cu to mn and calcination temperature by a simple redox method. By investigating the effects of synthesis conditions on the crystal phase, morphology and catalytic activity of the catalyst, the optimum process conditions were determined. The relationship between the structure and activity of the catalyst was revealed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that in the single manganese oxide, the doping of copper promotes the oxygen species movement, which makes the Cu-Mn composite oxide have lower reduction temperature and stronger redox ability. The amorphous state with poor crystallinity is also beneficial to the increase of oxygen hole and thus to the catalytic oxidation of formaldehyde. When the mass ratio of Cu / mn is 1: 2 and the calcination temperature is 300 鈩，

本文编号：2002152