Highly efficient Mn2O3 catalysts derived from Mn-MOFs for toluene oxidation: The influence of MOFs precursors

The effect of Mn-MOFs precursors (Mn-MIL-100, Mn-MOF-74 and Mn-BTC) on the performance of Mn(2)O(3 )catalysts pretreated with different atmosphere (Ar, O(2 )and O-2 after Ar treatment) for toluene oxidation is investigated in this work, respectively. The characteristics of the catalysts are investigated by using scanning electron microscope (SEM), the X-ray diffraction (XRD), Brunauer Emmett Teller (BET), X-ray photoelectron spectroscopy (XPS) and H-2 temperature programmed reduction (H-2-TPR). It is observed that Mn-MIL-100 pretreated with Ar and then with O-2 (Mn-100-Ar-O) shows better catalytic activity for toluene oxidation than MnMIL-100 pre-treated with single Ar or O-2. Furthermore, MOFs precursors have strongly influence on the structure and performance of Mn2O3 catalysts. The order of catalytic activity is as follows: Mn-100-Ar-O > Mn-BTC-ArO > Mn-74-Ar-O. In addition, Mn-100-Ar-O exhibits high stability, circulation performance and water resistance. The catalytic performance of Mn-100-Ar-O is obviously improved with the better reduction at low-temperature and the increase of surface molar ratio of Mn3+/Mn4+ and O-ads/O-latt.