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V2O5/TiO2与MoO3/TiO2催化剂表面结构形貌及其对催化氧化碳烟活性的影响

梅丛蔚 李立昌 梅德清 赵晓东 袁银男

梅丛蔚, 李立昌, 梅德清, 赵晓东, 袁银男. V2O5/TiO2与MoO3/TiO2催化剂表面结构形貌及其对催化氧化碳烟活性的影响[J]. 环境科学研究, 2016, 29(11): 1665-1671.
引用本文: 梅丛蔚, 李立昌, 梅德清, 赵晓东, 袁银男. V2O5/TiO2与MoO3/TiO2催化剂表面结构形貌及其对催化氧化碳烟活性的影响[J]. 环境科学研究, 2016, 29(11): 1665-1671.
MEI Congwei, LI Lichang, MEI Deqing, ZHAO Xiaodong, YUAN Yinnan. Surface Structure and Appearance of V2O5/TiO2 and MoO3/TiO2 Catalysts and Their Effect on Oxidation of Soot[J]. Research of Environmental Sciences, 2016, 29(11): 1665-1671.
Citation: MEI Congwei, LI Lichang, MEI Deqing, ZHAO Xiaodong, YUAN Yinnan. Surface Structure and Appearance of V2O5/TiO2 and MoO3/TiO2 Catalysts and Their Effect on Oxidation of Soot[J]. Research of Environmental Sciences, 2016, 29(11): 1665-1671.

V2O5/TiO2与MoO3/TiO2催化剂表面结构形貌及其对催化氧化碳烟活性的影响

基金项目: 国家自然科学基金项目(51376095,51506101);江苏高校优势学科建设工程资助项目(苏政发办[2014]72号)

Surface Structure and Appearance of V2O5/TiO2 and MoO3/TiO2 Catalysts and Their Effect on Oxidation of Soot

  • 摘要: 为研究纳米级V2O5与MoO3催化剂表面结构对其催化氧化碳烟活性的影响,以TiO2为载体,采用等体积浸渍法制备了不同负载率(5%、10%、20%、40%)的V2O5/TiO2与MoO3/TiO2催化剂,通过扫描电镜(SEM)、X射线衍射仪(XRD)对比研究了2种催化剂在TiO2载体上的分散状态及物相结构.以Printex-U碳黑为试验用碳烟,采用热重分析仪对V2O5与MoO3催化剂催化碳烟氧化的活性进行了比较.结果表明:V2O5与MoO3在TiO2载体上均存在一个单层分散饱和阈值,分别为V20(负载率为20%,下同)、Mo10,在该阈值前后活性组分在载体上分别以单层分散状态和明显的晶态存在.对于V2O5催化剂,其最佳催化活性出现在负载率接近单层分散饱和阈值时,与无催化状态相比,Ti(起燃温度)、Tp(最大失重率温度)以及Tf(燃尽温度)分别下降了69.1、46.0、23.0 ℃,有明显的阈值效应.而对于MoO3催化剂,因其自身低熔点性而表现出良好的表面迁移能力,再加上α-MoO3晶体特有的层状结构,使其可释放出更多的晶格氧,随着负载率的增加,该催化剂催化氧化碳烟活性持续增加,并且未观察到明显的阈值效应.研究显示,在相同负载率下,MoO3催化剂催化氧化碳烟活性均高于V2O5催化剂.

     

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出版历程
  • 收稿日期:  2016-01-11
  • 修回日期:  2016-08-22
  • 刊出日期:  2016-11-25

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