Abstract
Three kinds of three‐dimensional (3D) Mn2O3 catalysts with different morphologies (cube, fan‐like structure, and sphere) and various exposed crystal planes were prepared by a hydrothermal method for benzene oxidation. The activity results suggested that sample Mn2O3‐Cl with hierarchical cube morphology exhibited a better rate of benzene degradation than the other samples. Mn2O3‐Cl exhibited the lowest complete benzene conversion temperature (T90 = 252°C), which was ~48°C lower than that of the Mn2O3‐S sample. Meanwhile, the Rm and Rs values of Mn2O3‐Cl were 2.71 and 3.21 times, respectively, higher than those of Mn2O3‐S. TEM results suggested that morphology has a significant effect on crystal planes. The activity–morphology relationship over the Mn2O3 samples was investigated by multiple analytical techniques. It can be concluded that the low crystallinity, superior redox ability, abundant low‐valence Mn ions, and Olatt species in the Mn2O3‐Cl catalyst were responsible for its superior catalytic activity.
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