Deep oxidation of 1,2-dichlorobenzene over Ti-doped iron oxide.
Ti-doped iron oxides with worm-like mesopores were successfully prepared using CTAB as the structure-directing agent. The as-prepared catalysts were characterized by XRD, Raman, H2-TPR, XPS, TEM, and N2 adsorption/desorption. The catalytic properties for oxidation of 1,2-dichlorobenzene (o-DCB) were investigated. The results showed that Fe18Ti2Ox with 10 mol% Ti-doping shows the best catalytic activity, and the total conversion of o-DCB can be obtained at 350 °C. Moreover, Fe18Ti2Ox exhibits higher stability, CO2 selectivity and lower apparent activation energy. The high activity of Fe18Ti2Ox could be ascribed to the combined factors including a smaller crystallite size, excellent low-temperature reducibility, high surface active oxygen concentration and a synergic effect between TiO2 and mixed iron oxide (γ-Fe2O3 and α-Fe2O3). Acetate and formate species as intermediates were detected by in situ FTIR spectroscopy. A two-step redox mechanism of o-DCB decomposition on the surface of Ti-doped iron oxides was proposed. These results demonstrated that Ti-doped iron oxides could be developed as environmentally friendly catalysts for the deep oxidation of chlorinated volatile organic pollutants.
Key Laboratory of Environmental Pollution Process and Standard, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China. maxd@nankai.edu.cn.
Xiaodong
X
Ma
Xueyue
X
Suo
Huiqin
H
Cao
Jie
J
Guo
Lu
L
Lv
Hongwen
H
Sun
Meihua
M
Zheng