Organic Chemistry: Current Research
Open Access
ISSN: 2161-0401
+44 1478 350008
ISSN: 2161-0401
+44 1478 350008
Xiaolong Liu
Institute of Process Engineering-CAS, China
Scientific Tracks Abstracts: Organic Chem Curr Res
Volatile organic compounds (VOCs) emitted from the industrial plants are toxic and are dangerous to human health. Among the abundant VOCs pollutants, chlorinated volatile organic compounds (OVOCs), including chlorobenzene (CB), dichloromethane (DCM), 1, 2-dichloroethane (DCE), and trichloroethylene (TCE), are regarded as an important group of VOC pollutants due to its high toxicity, strong stability, and poor reactivity. In comparison to other noble metals (Pd, Pt, Rh), Ru catalysts have been far less explored in environmental catalysis. Recently, Ru catalysts have been well demonstrated in catalytic oxidation of alkanes, alkenes, aromatics, and some halogenated volatile organic compounds. In this work, noble metal catalysts (Pd, Pt, Ru, and Rh) were prepared and evaluated in the catalytic oxidation chlorobenzene, and Ru/TiO2 contributed the best catalytic performance. During the oxidation, polychlorinated benzenes PhClx (x≥2) were observed, and Ru/TiO2 showed apparently lower PhClx concentrations than other three samples. Besides, the dioxin-like PCBs (dl-PCBs) were collected and analyzed for Pd/TiO2 and Ru/TiO2. The Σdl-PCBs produced by Pd/TiO2 was about 1.5 times that of Ru/TiO2. XPS analyses revealed that Ru/TiO2-used gave the lowest Cl content among the used catalysts, and the lowest (Clad+Clor)/Cl value and the highest Clbr/Cl value, which might be an important reason for its strongest chlorine removal ability and the lowest yields of polychlorinated by-products. In-situ FTIR studies were also conducted for Pd, Pt, Ru, and Rh catalysts, and various organic intermediates were observed on the catalyst surface. Besides, density functional theory (DFT) was also conducted to investigate the main reason for the difference of the catalytic performance of Ru and other three samples (Pd, Pt, and Rh). Accordingly, a reaction mechanism for the catalytic oxidation of chlorobenzene was proposed.
Recent Publications
1. Liu X, Zeng J, Shi W, Wang J, Zhu T and Chen Y (2017) Catalytic oxidation of benzene over ruthenium-cobalt bimetallic catalysts and study of its mechanism. Catal. Sci. Technol. 7:213-221.
2. Shi W, Liu X, Zeng J, Wang J, Wei Y and Zhu T (2016) Gas-solid catalytic reactions over ruthenium based catalysts. Chin. J. Catal. 37(8):1181-1192.
3. Liu X, Chen L, Zhu T and Ning R (2019) Catalytic oxidation of chlorobenzene over noble metals (Pd, Pt, Ru, Rh) and the distributions of polychlorinated by-products. J. Hazard. Mater. 363:90-98.
4. Wang J, Liu X, Zeng J and Zhu T (2016) Catalytic oxidation of trichloroethylene over TiO2 supported ruthenium catalysts. Catal. Commun. 76:13-18.
5. Ye M, Chen L, Liu X, Xu W, Zhu T and Chen G (2018) Catalytic oxidation of chlorobenzene over rutheniumceria bimetallic catalysts. Catalysts 8(3):116.
Xiaolong Liu has completed his PhD at Zhejiang University. Currently, he is working as an Assistant Professor at the Institute of Process Engineering, Chinese Academy of Sciences. He has published more than 15 papers in reputed journals. His research interests mainly focus on the catalytic oxidation of organic pollutants, such as VOCs (volatile organic compounds) & POPs (persistent organic pollutants).