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首页> 外文期刊>Environmental Science & Technology >Manganese Oxides with Rod-, Wire-, Tube-, and Flower-Like Morphologies: Highly Effective Catalysts for the Removal of Toluene
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Manganese Oxides with Rod-, Wire-, Tube-, and Flower-Like Morphologies: Highly Effective Catalysts for the Removal of Toluene

机译:具有杆状,线状,管状和花状形态的氧化锰:高效去除甲苯的催化剂

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摘要

Nanosized rod-like, wire-like, and tubular α-MnO_2 and flower-like spherical Mn_2O_3 have been prepared via the hydrothermal method and the CCl4 solution method, respectively. The physicochemical properties of the materials were characterized using numerous analytical techniques. The catalytic activities of the catalysts were evaluated for toluene oxidation. It is shown that α-MnO_2 nanorods, nanowires, and nanotubes with a surface area of 45-83 m~2/g were tetragonal in crystal structure, whereas flower-like spherical Mn_2O_3 with a surface area of 162 m~2/g was of cubic crystal structure. There were the presence of surface Mn ions in multiple oxidation states (e.g., Mn~(3+), Mn~(4+), or even Mn~(2+)) and the formation of surface oxygen vacancies. The oxygen adspecies concentration and low-temperature reducibility decreased in the order of rod-like a-MnO_2 > tube-like α-MnO_2 > flower-like Mn_2O_3 > wire-like α-MnO_2, in good agreement with the sequence of the catalytic performance of these samples. The best-performing rod-like α-MnO_2 catalyst could effectively catalyze the total oxidation of toluene at lower temperatures (T_(50%_ = 210 ℃ and T_(90%) = 225 ℃ at space velocity = 20000 mL/(g h)). It is concluded that the excellent catalytic performance of α-MnO_2 nanorods might be associated with the high oxygen adspecies concentration and good low-temperature reducibility. We are sure that such one-dimensional well-defined morphological manganese oxides are promising materials for the catalytic elimination of air pollutants.
机译:分别通过水热法和CCl4溶液法制备了纳米棒状,线状和管状的α-MnO_2和花状球形Mn_2O_3。使用多种分析技术对材料的物理化学性质进行了表征。评估催化剂的催化活性对甲苯氧化。结果表明,α-MnO_2纳米棒,纳米线和纳米管的表面积为45-83 m〜2 / g为四方晶,而花状球形Mn_2O_3的表面积为162 m〜2 / g。立方晶体结构。存在处于多种氧化态(例如,Mn〜(3 +),Mn〜(4+),甚至Mn〜(2+))的表面Mn离子并形成表面氧空位。氧的形态浓度和低温还原性依次以棒状α-MnO_2>管状α-MnO_2>花状Mn_2O_3>线状α-MnO_2的顺序降低,与催化性能顺序吻合这些样本中。性能最佳的棒状α-MnO_2催化剂可在较低的温度下(空速= 20000 mL /(gh)的T_(50%_ = 210℃和T_(90%)= 225℃)有效催化甲苯的总氧化。 )。结论:α-MnO_2纳米棒的优异催化性能可能与高的氧形态浓度和良好的低温还原性有关,我们确信这种​​一维形态清晰的锰氧化物是有前途的材料。催化消除空气污染物。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.4034-4041|共8页
  • 作者单位

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

    Laboratory of Catalysis Chemistry and Nanoscience, Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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