Ultralow Loading of Silver Nanoparticles on Mn2O3 Nanowires Derived with Molten Salts: A High-Efficiency Catalyst for the Oxidative Removal of Toluene

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• 作者：Jiguang Deng ; Shengnan He ; Shaohua Xie ; Huanggen Yang ; Yuxi Liu ; Guangsheng Guo ; Hongxing Dai
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：September 15, 2015
• 年：2015
• 卷：49
• 期：18
• 页码：11089-11095
• 全文大小：385K
• ISSN：1520-5851

文摘

Using a mixture of NaNO₃ and NaF as molten salt and MnSO₄ and AgNO₃ as metal precursors, 0.13 wt % Ag/Mn₂O₃ nanowires (0.13Ag/Mn₂O₃-ms) were fabricated after calcination at 420 掳C for 2 h. Compared to the counterparts derived via the impregnation and poly(vinyl alcohol)-protected reduction routes as well as the bulk Mn₂O₃-supported silver catalyst, 0.13Ag/Mn₂O₃-ms exhibited a much higher catalytic activity for toluene oxidation. At a toluene/oxygen molar ratio of 1/400 and a space velocity of 40鈥?00 mL/(g h), toluene could be completely oxidized into CO₂ and H₂O at 220 掳C over the 0.13Ag/Mn₂O₃-ms catalyst. Furthermore, the toluene consumption rate per gram of noble metal over 0.13Ag/Mn₂O₃-ms was dozens of times as high as that over the supported Au or AuPd alloy catalysts reported in our previous works. It is concluded that the excellent catalytic activity of 0.13Ag/Mn₂O₃-ms was associated with its high dispersion of silver nanoparticles on the surface of Mn₂O₃ nanowires and good low-temperature reducibility. Due to high efficiency, good stability, low cost, and convenient preparation, 0.13Ag/Mn₂O₃-ms is a promising catalyst for the practical removal of volatile organic compounds.