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煅烧温度对Mn/TiO2催化剂催化NO氧化活性的影响

安忠义 ,  禚玉群 ,  陈昌和

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引用本文: 安忠义, 禚玉群, 陈昌和. 煅烧温度对Mn/TiO2催化剂催化NO氧化活性的影响[J]. 燃料化学学报, 2014, 42(3): 370-376. shu
Citation:  AN Zhong-yi, ZHUO Yu-qun, CHEN Chang-he. Influence of calcination temperature on the catalytic activity of Mn/TiO2 for NO oxidation[J]. Journal of Fuel Chemistry and Technology, 2014, 42(3): 370-376. shu

煅烧温度对Mn/TiO2催化剂催化NO氧化活性的影响

    通讯作者: 禚玉群,E-mail:zhuoyq@tsinghua.edu.cn
  • 基金项目:

    国家自然科学基金(51276034)。 (51276034)

摘要: 以浸渍在二氧化钛上的锰基催化剂为对象,研究了制备过程中煅烧温度对锰基催化剂催化NO氧化活性的影响。结果表明,较低的煅烧温度有利于提高Mn/TiO2催化剂对于NO氧化的催化效率。利用X射线粉末衍射(XRD)、场发射扫描电子显微镜(FESEM)、X射线光电子能谱(XPS)、H2程序升温还原(H2-TPR)和O2程序升温脱附(O2-TPD)等表征手段研究了煅烧温度影响Mn/TiO2催化剂催化活性的作用机理。结果表明,在NO氧化过程中发挥主要作用的是Mn2O3,较低的煅烧温度有利于提高Mn2O3在锰氧化物中所占的比例,同时增加锰氧化物在载体表面的分散度,从而改善催化剂活性;当煅烧温度超过500 ℃时,催化剂会发生烧结,载体TiO2的晶形开始由锐钛型向金红石型转变,Mn2O3也从非晶相向晶相转变。H2-TPR和O2-TPD测试结果表明,低温煅烧有利于提高催化剂的还原性能和表面化学吸附态O2-的脱附性能,良好的还原性能和脱附性能的相互作用使催化剂表面的氧有较好的移动能力,从而促进催化剂的活性。

English

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  • 收稿日期:  2013-09-13
  • 网络出版日期:  2013-12-25
通讯作者: 陈斌, bchen63@163.com
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