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

Authors：Zhang, Jinhui; Zhang, Hanyue; Zhu, Xinfeng^*; Liu, Hongpan; Hou, Guangchao; Kang, Haiyan; Liu, Biao; Zhu, Wenwen; Yin, Shiqiang; Song, Zongxian^*

Source：Applied Organometallic Chemistry, 2023, 37(3).

DOI：10.1002/aoc.7010

• benzene
• catalytic oxidation
• crystal plane
• Mn2O3
• morphology

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.