Constructing three-dimensional Mn2O3 catalysts with various morphologies for catalytic oxidation of benzene

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 (T-90 = 252 degrees C), which was similar to 48 degrees C lower than that of the Mn2O3-S sample. Meanwhile, the R-m and R-s 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 O-latt species in the Mn2O3-Cl catalyst were responsible for its superior catalytic activity.

Automated summary

Three kinds of 3D Mn2O3 catalysts with different morphologies and crystal planes were prepared by a hydrothermal method for benzene oxidation. The cube-shaped Mn2O3-Cl sample exhibited the highest rate of benzene degradation and the lowest complete benzene conversion temperature compared to other samples. TEM results showed that morphology significantly affected crystal planes. The superior catalytic activity of Mn2O3-Cl was attributed to its low crystallinity, excellent redox ability, abundant low-valence Mn ions, and O-latt species.