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    Hydrolysis driving redox reaction to synthesize Mn-Fe binary oxides as highly active catalysts for the removal of toluene
    Chen, J (Chen, Jin); Chen X (Chen, Xi); Xu, WJ (Xu, Wenjian); Xu, Z (Xu, Zhen); Chen, JZ (Chen, Jiazi); Jia, HP* (Jia, Hongpeng); Chen, J* (Chen, Jing)

    A novel hydrolysis driving redox reaction via combining selective reduction of KMnO4 by H2O2 and hydrolysis of Fe salts has been successfully applied to rapidly prepare a series of homogenous Mn-Fe binary oxides (xMn1Fe). The 3Mn1Fe catalyst exhibits better catalytic activity for toluene oxidation compared to MnO2, Fe2O3 and Cop-3Mn1Fe. The improved performance of 3Mn1Fe could arise from higher surface area, higher amount of Mn3+ ions, higher concentration of lattice defects and oxygen vacancies, and better low-temperature reducibility, as well as homogenous distribution of Mn and Fe. In terms of Mn/Fe ratio in xMn1Fe, the 5Mn1Fe catalyst exhibits a higher catalytic activity in toluene conversion. At 137 and 147 °C, the conversion efficiency of toluene by 5Mn1Fe can reach 50% and 90%, respectively, while at 215 °C a complete mineralization of toluene (20000 mL/(g h), 1000 ppm) can be achieved. The application of high GHSV of 240000 mL/(g h) confirms that the 5Mn1Fe catalyst still has high catalytic ability in the removal of toluene, showing complete mineralization at 250 °C. The endurability test (240000 mL/(g h)) and the water effect test of the 5Mn1Fe catalyst show that it has good stability, renewability, and high toleration of high-moisture. With the combination of in situ Raman, in situ FTIR characterizations and on-line MS, the mechanism for catalytic oxidation of toluene over xMn1Fe is revealed.

    Key words:Hydrolysis; Redox reaction; Homogenous dispersion; Mn-Fe binary oxide; VOCs

    Volume:330

    Page:281-293

    Journal:CHEMICAL ENGINEERING JOURNAL

    http://dx.doi.org/10.1016/j.cej.2017.07.147

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