首页> 外文期刊>Environmental Science & Technology >Hydrothermal Fabrication and Catalytic Properties of La_(1-x)Sr_xM_(1-y)Fe_yO_3 (M = Mn, Co) That Are Highly Active for the Removal of Toluene
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Hydrothermal Fabrication and Catalytic Properties of La_(1-x)Sr_xM_(1-y)Fe_yO_3 (M = Mn, Co) That Are Highly Active for the Removal of Toluene

机译:La_(1-x)Sr_xM_(1-y)Fe_yO_3(M = Mn,Co)的水热法制备及催化性能

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摘要

A series of La_(1-x)Sr_xM_(1-y)Fe_yO_3 (M = Mn, Co; x = 0, 0.4; y = 0.1, 1.0) perovskite-type oxide catalysts have been fabricated via a strategy of citric acid complexaton coupled with hydrothermal treatment The materials are characterized by a number of analytical techniques. The oxidation of toluene is used as a probe reaction for the evaluation of catalytic performance. It is found that both La_(0.6)Sr_(0.4)FeO_3 and LaFeO_3 exhibit high activities. The partial substitution of manganese and cobalt with iron can significantly improve the catalytic performance of La_(0.6)Sr_(0.4)_MnO_3 and La_(0.6)Sr_(0.4)CoO_3. At toluene/O_2 molar ratio = 1/200 and space velocity = 20 000 h~(-1), the catalytic activity decreases in the sequence of La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3 > La_(0.6)Sr_(0.4)FeO_3 > La_(0.6)Sr_(0.4)Mn_(0.9)Fe_(0.1)O_3 > LaFeO_3 > La_(0.6)Sr_(0.4)CoO_3 > La_(0.6)Sr_(0.4)MnO_3. Compared to the Fe-free counterparts, the La_(0.6)Sr_(0.4)Mn_(0.9)Fe_(0.1)O_3 and La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3 catalysts are, respectively, 50 and 85 ℃ lower with regard to the temperature required for complete toluene oxidation. Toluene can be completely oxidized at 245 C over La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3. The excellent catalytic performance of La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3 can be attributed to the presence of (ⅰ) Fe~(3+)-0-Fe~(4+) couples, (ⅱ) a transition of electronic structure, and (ml a trace amount of Co_3O_4.
机译:通过柠檬酸络合策略制备了一系列La_(1-x)Sr_xM_(1-y)Fe_yO_3(M = Mn,Co; x = 0,0.4; y = 0.1,1.0)钙钛矿型氧化物催化剂结合水热处理该材料具有多种分析技术。甲苯的氧化用作探针反应以评估催化性能。发现La_(0.6)Sr_(0.4)FeO_3和LaFeO_3均表现出高活性。用铁部分取代锰和钴可以显着提高La_(0.6)Sr_(0.4)_MnO_3和La_(0.6)Sr_(0.4)CoO_3的催化性能。在甲苯/ O_2摩尔比= 1/200,空速= 20000h〜(-1)的条件下,La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3> La_ (0.6)Sr_(0.4)FeO_3> La_(0.6)Sr_(0.4)Mn_(0.9)Fe_(0.1)O_3> LaFeO_3> La_(0.6)Sr_(0.4)CoO_3> La_(0.6)Sr_(0.4)MnO_3。与不含Fe的催化剂相比,La_(0.6)Sr_(0.4)Mn_(0.9)Fe_(0.1)O_3和La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3催化剂分别为50相对于甲苯完全氧化所需的温度低85℃。甲苯可以在La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3上于245°C完全氧化。 La_(0.6)Sr_(0.4)Co_(0.9)Fe_(0.1)O_3的优异催化性能可归因于(ⅰ)Fe〜(3 +)-0-Fe〜(4+)对的存在,( ⅱ)电子结构的转变,和(ml痕量的Co_3O_4。

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  • 来源
    《Environmental Science & Technology》 |2010年第7期|p.2618-2623|共6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, People's Republic of 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, People's Republic of 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, People's Republic of 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, People's Republic of China;

    Department of Chemistry, Centre for Surface Analysis and Research, Hong Kong Baptist University, Kowloon Tong, Hong Kong, People's Republic of 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, People's Republic of China;

    Department of Chemistry, Centre for Surface Analysis and Research, Hong Kong Baptist University, Kowloon Tong, Hong Kong, People's Republic of China;

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