Rod‐Like MnOx Catalyst Derived from Mn‐MOF‐74 for Chlorobenzene Oxidation at Low Temperature

Abstract In this study, a series of MnO x catalysts were prepared by pyrolysis of Mn‐MOF‐74 precursors. The calcination temperature had influence on the structure and catalytic performance of MnO x catalysts in the catalytic oxidation of chlorobenzene. Their physicochemical properties were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption/desorption, X‐ray photoelectron spectroscopy (XPS), H 2 temperature programmed reduction (H 2 ‐TPR) and Fourier transform infrared (FTIR), respectively. The order of catalytic activity was as follows: rod‐like MnO x ‐700 > rod‐like MnO x ‐600 > boat‐like MnO x ‐800. The MnO x ‐700 catalysts exhibited excellent activity for chlorobenzene (CB) decomposition, and the T 90 (temperature with CB conversion of 90 %) was 225 °C. The main reason was that MnO x ‐700 inherited the advantage of Mn‐MOF‐74 with high specific surface area, and had higher ratio of Mn 3+ /Mn 4+ (2.51) and O sur /O total (0.53). Meanwhile, the MnO x ‐700 can maintain over 90 % CB conversion at elevated temperature for 100 h. This work can provide an idea for the further development of high efficiency catalysts prepared via MOF‐template in the CB decomposition.