TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

He, Xu; Guo, Haiwei; Liu, Xiaoyao; Wen, Jiaxin; Ren, Gengbo; Ma, Xiaodong

TiO2 nanosheet supported MnCeOx: a remarkable catalyst with enhanced low-temperature catalytic activity in o-DCB oxidation

2022

Morphology engineering was an effective strategy for 1,2-dichlorobenzene (o-DCB) oxidation. Herein, TiO₂ nanosheet supported MnCeOₓ (TiMn15Ce30-NS) showed excellent catalytic activity with T₅₀% = 156 °C and T₉₀% = 238 °C, which was better than the T₅₀% = 213 °C and T₉₀% = 247 °C for TiO₂ nano truncated octahedron supported MnCeOₓ (TiMn15Ce30-NTO). TiMn15Ce30-NS also exhibited enhanced water resistance (T₅₀% = 179 °C, T₉₀% = 240 °C), and good stability with the o-DCB conversion retained at 98.9% for 12 h at 350 °C. The excellent catalytic activity of TiMn15Ce30-NS could be mainly ascribed to the preferentially exposed {001} crystal plane and Ce addition which favored the higher concentration of Mn⁴⁺ and surface active oxygen, along with stronger interaction between MnOₓ and CeOₓ. The present results deepen the understanding of the morphology-dependent effect on o-DCB oxidation.

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