| Title: | "Catalytic oxidation of chlorobenzene over noble metals (Pd, Pt, Ru, Rh) and the distributions of polychlorinated by-products" |
| Author(s): | Liu X; Chen L; Zhu T; Ning R; |
| Address: | "Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Electronic address: liuxl@ipe.ac.cn. Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China. Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China. Electronic address: tyzhu@ipe.ac.cn. Beijing Engineering Research Center of Process Pollution Control, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Chemistry and Chemical Engineering, Guizhou University, Guiyang, Guizhou 550025, China" |
| DOI: | 10.1016/j.jhazmat.2018.09.074 |
| ISSN/ISBN: | 1873-3336 (Electronic) 0304-3894 (Linking) |
| Abstract: | "Catalytic oxidation of chlorobenzene over noble metal catalysts Pd/TiO(2), Pt/TiO(2), Ru/TiO(2), and Rh/TiO(2) was evaluated, and Ru/TiO(2) contributed the highest catalytic activity and CO(2) selectivity. During the oxidation, polychlorinated benzenes PhCl(x) (x >/= 2) were observed, and Ru/TiO(2) showed apparently lower PhCl(x) concentrations than other three samples. With the improvement of temperature, the maximum concentration appeared in the sequence of dichlorobenzene (PhCl(2)), trichlorobenzene (PhCl(3)), tetrachlorobenzene (PhCl(4)), and pentchlorobenzene (PhCl(5)), whereas the concentration of hexachlorobenzene (PhCl(6)) was always low and showed no apparent regularity. Besides, the dioxin-like PCBs (dl-PCBs) were collected and analyzed for Pd/TiO(2) and Ru/TiO(2). The summation operatordl-PCBs produced by Pd/TiO(2) (0.0055 ng WHO-TEQ/Nm(3)) was about 1.5 times that of Ru/TiO(2) (0.0027 ng WHO-TEQ/Nm(3)). XPS analyses revealed that Ru/TiO(2)-used and Rh/TiO(2)-used gave the lowest and the highest Cl content of 0.61% and 1.87%. Ru/TiO(2)-used afforded the lowest (Cl(ad)+Cl(or))/Cl value (22.1%) and the highest Cl(br)/Cl value (77.9%), which might be an important reason for its strongest chlorine removal ability and the lowest yields of polychlorinated by-products, whereas other three catalysts showed similarity in the Cl distributions. Additionally, systematic in-situ FTIR studies were conducted, and a reaction mechanism for the catalytic oxidation of chlorobenzene was proposed" |
| Keywords: | Catalytic oxidation Chlorinated volatile organic compounds Chlorobenzene Noble metals Polychlorinated by-products; |
| Notes: | "PubMed-not-MEDLINELiu, Xiaolong Chen, Li Zhu, Tingyu Ning, Ruliang eng Research Support, Non-U.S. Gov't Netherlands 2018/10/12 J Hazard Mater. 2019 Feb 5; 363:90-98. doi: 10.1016/j.jhazmat.2018.09.074. Epub 2018 Oct 3" |
