铜锰复合氧化物低温催化氧化甲醛的性能研究  

Copper manganese oxides for formaldehyde catalytic oxidation at low temperature

作　　者：陈莹[1,2] 贺军辉[1] 田华[1] 王东辉[3] 杨巧文[2] 

机构地区：[1]中国科学院理化技术研究所微纳材料与技术研究中心功能纳米材料实验室,北京100190 [2]中国矿业大学(北京)化学与环境工程学院,北京100083 [3]防化研究院,北京100083

出　　处：《科技导报》2017年第23期46-51,共6页Science & Technology Review

基　　金：国家自然科学基金项目(21271177;21571182);中国科学院理化技术研究所所长基金项目

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。A series of copper manganese oxides are synthesized using a simple redox method by controlling the molar ratio of Cu and Mn and calcination temperature. The optimum conditions are determined by investigating the effects of synthesis conditions on crystal phase, morphology and catalytic activity of catalysts. The relationship between structure and activity of catalyst is revealed by combining X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and other characterizations. The results show that more oxygen vacancy generated by the addition of copper may promote the oxygen species mobile, which leads to a lower reduction temperature and strong ability of oxidation reduction. The amorphous type of copper manganese oxide with poor crystallinity is also beneficial to the increase of oxygen vacancy, which facilitates the catalytic oxidation of formaldehyde. The eatulyst with copper and manganese molar ratio of 1：2 and calcination temperature of 300℃ exhibites the best catalytic performance and can completely deeompese formaldehyde at 90℃.

关 键 词：氧化锰 铜锰复合氧化物 甲醛氧化 氧化还原性能 

分 类 号：O643.36[理学—物理化学]