A Facile Method for in Situ Preparation of the MnO2/LaMnO3 Catalyst for the Removal of Toluene

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• 作者：Wenzhe Si ; Yu Wang ; Shen Zhao ; Fangyun Hu ; Junhua Li
• 刊名：Environmental Science & Technology
• 出版年：2016
• 出版时间：April 19, 2016
• 年：2016
• 卷：50
• 期：8
• 页码：4572-4578
• 全文大小：460K
• 年卷期：0
• ISSN：1520-5851

文摘

MO_x/ABO₃ is a promising catalyst for the high-efficiency removal of volatile organic compounds. However, this catalyst is limited on practical applications due to its complex synthesis procedure and high cost. In this work, the MnO₂/LaMnO₃ catalyst was prepared in situ using a facile one-step method for the first time, in which partial La cations were selectively removed from three dimensionally chain-like ordered macroporous (3DOM) LaMnO₃ material. After selective removal, the obtained MnO₂/LaMnO₃ sample expressed an excellent catalytic performance on toluene oxidation. Toluene could be completely oxidized into CO₂ and H₂O at 290 °C over the MnO₂/LaMnO₃ catalyst with a toluene/oxygen molar ratio of 1/100 and a space velocity of 120 000 mL/(g h). In addition, the apparent activation energy value of MnO₂/LaMnO₃ was 57 kJ/mol, which was lower than those of other metal oxides catalysts. According to O₂-TPD and XPS results, it is concluded that the high catalytic performance of MnO₂/LaMnO₃ was mainly associated with the large amount of oxygen species and the excellent lattice oxygen mobility. MnO₂/LaMnO₃ is a promising catalyst for the practical removal of volatile organic compounds due to its high efficiency, good stability, low cost, and convenient preparation.