物理化学学报 >> 2012, Vol. 28 >> Issue (01): 184-188.doi: 10.3866/PKU.WHXB201111162

催化和表面科学 上一篇    下一篇

α-Fe2O3表面结构对NH3选择性催化还原NO活性的影响

杨兴业1,2, 李斌1, 孙亮2, 黄志伟2, 成晓敏1, 张韬伟1, 唐幸福2   

  1. 1. 中北大学化工与环境学院, 太原 030051;
    2. 复旦大学环境科学与工程系, 上海 200433
  • 收稿日期:2011-09-13 修回日期:2011-11-14 发布日期:2011-12-29
  • 通讯作者: 李斌, 唐幸福 E-mail:libin4y@163.com; tangxf@fudan.edu.cn

Effect of Surface Structure of α-Fe2O3 on the Selective Catalytic Reduction of NO by NH3

YANG Xing-Ye1,2, LI Bin1, SUN Liang2, HUANG Zhi-Wei2, CHENG Xiao-Min1, ZHANG Tao-Wei1, TANG Xing-Fu2   

  1. 1. School of Chemical and Engineering and Environment, North University of China, Taiyuan 030051, P. R. China;
    2. Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, P. R. China
  • Received:2011-09-13 Revised:2011-11-14 Published:2011-12-29
  • Contact: LI Bin, TANG Xing-Fu E-mail:libin4y@163.com; tangxf@fudan.edu.cn

摘要: 通过水热法合成了两种具有不同形貌的α-Fe2O3纳米棒和纳米立方体, 并探索了它们的中温NH3选择性催化还原(NH3-SCR)NO 的活性. NH3-SCR 测试表明α-Fe2O3 纳米棒具有更高的催化活性. X 射线粉末衍射(XRD)、场发射扫描电镜(FE-SEM)和高分辨透射电镜(HRTEM)结构分析表明: α-Fe2O3纳米棒暴露有高表面能的{110}活性面, 而纳米立方体暴露的主要是低表面能的{012}晶面. H2程序升温还原(H2-TPR)和NO程序升温脱附(NO-TPD)结果证明纳米棒比纳米立方体具有更高的氧化还原性能. 因此, α-Fe2O3纳米棒由于暴露高表面能的活性面具有比纳米立方体更高的NH3-SCR性能.

关键词: NO, α-Fe2O3, NH3选择性催化还原, 表面结构影响

Abstract: α-Fe2O3 samples with nanocube and nanorod morphologies were synthesized by a simple hydrothermal route. The samples were characterized by powder X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), temperature- programmed reduction by H2 (H2-TPR), and temperature-programmed desorption of NO (NO-TPD), and tested for the selective catalytic reduction with NH3 (NH3-SCR) of NO at moderate temperatures. The α-Fe2O3 nanocubes possessed predominantly exposed {012} faces with low surface energy, while the nanorods also had some high energy {110} faces exposed. The catalytic activities of the α-Fe2O3 samples were predominantly governed by their surface structures. The nanorods showed much higher activity than the nanocubes under identical conditions, consistent with the better redox properties of the nanorods as confirmed by H2-TPR and NO-TPD measurements. Therefore, α-Fe2O3 nanorods with exposed high energy faces have much higher activity for NH3-SCR than nanocubes with exposed low energy faces under identical reaction conditions.

Key words: NO, α-Fe2O3, Selective catalytic reduction by NH3, Surface structure effect

MSC2000: 

  • O643