摘要
采用不同的浸渍法制备了负载型催化剂Cu-Mn-O/Ce/γ-Al2O3-TiO2,应用X射线粉末衍射(XRD)、低温液氮吸附(BET)、H2程序升温还原(H2-TPR)和X射线光电子能谱(XPS)等测试技术对催化剂进行了表征。在200～500℃考察了催化剂催化燃烧较高浓度的苯(体积分数为3.6%)反应中的催化性能。结果表明,15%CuMn2Ox/Al2O3-TiO2催化剂(CuMn2Ox质量分数为15%)在300℃苯的转化率达到79%,其低温催化活性明显高于单独负载氧化铜或氧化锰的催化剂。而采用共浸渍法制备的催化剂15%CuMn2Ox-15%CeO2/Al2O3-TiO2在300℃苯的转化率达81%,其催化活性明显高于分步浸渍法制备的催化剂。CeO2的添加更利于提高共浸渍法制备的催化剂中各活性组分的分散度和相互作用。
The catalytic combustion of （ φ = 3.6% ） benzene during 200 - 500℃ was investigated on the supported Cu-Mn-O/Ce/γ-Al2O3-TiO2 catalysts prepared via different wet impregnation methods and characterized by X-ray diffraction（ XRD）, N2 adsorption at liquid-nitrogen temperature（ BET）, H2 temperature programmed reduction（ HE-TPR） and X-ray photoelectron spectroscopy（XPS） techniques. The results show that the 15% CuMnEOx/A1EO3-TiO2 catalyst （to （CuMn20x） = 15% ） achieving 79% conversion of benzene at 300℃ presented higher activity than Cu/A1EO3-TiO2 and Mn/AIEO3-TiO2 catalysts. While, the 15% CuMn2Ox-15% CeO2/Al2O3-TiO2 catalyst obtained by co-impregnation method attaining 81% conversion of benzene at 300℃ showed much higher catalytic activity than the catalyst prepared by two step impregnation. The addition of CeO2 in co-impregnation method can enhance the dispersion and interaction of components.
出处
《应用化学》
CAS
CSCD
北大核心
2010年第2期137-141,共5页
Chinese Journal of Applied Chemistry
基金
国家发改委重大产业化资助项目((2005)1255-12)
关键词
铜锰复合氧化物
氧化铈
苯
催化燃烧
copper and manganese oxides, ceria, benzene, catalytic combustion
