期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 144, 期 -, 页码 580-587出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.07.067
关键词
Transformer oil-contained PCBs; Pd/C; Hydrodechlorination (HDC); Characterization
资金
- National Natural Science Foundation of China [21007088]
- Knowledge Innovation Program of Chinese Academy of Sciences [KZCX2-EW-206]
- Research Grant for Outstanding Young Scientists of Shandong Province [BS2009CL006]
The influences of solvent system on the hydrodechlorination (HDC) of transformer oil-contained PCBs with H-2 over Pd/C catalyst were studied. The addition of water in solvent system significantly accelerated the HDC reaction, which suggested its critical role for enabling Pd/C catalyst to keep high activity and stability. The mechanism of this phenomenon was studied through catalyst characterization (TEM, XRD and XPS), and the change of surface composition of Pd/C catalyst in different solvent in the HDC reaction was raveled. Above results indicated that water in isopropanol-water prevented NaCl accumulating on the surface of catalyst, which avoided the decline in activity and stability of the catalyst. On the basis of these studies, isopropanol-water (60/40, v/v) solvent system was developed to dispose high concentration transformer oil-contained PCBs, where the chloride atom removal ratio of transformer oil-contained PCBs at 2% (w/w) and 5% (w/w) concentration could reach 95.2% and 88.0% for 10 h under mild conditions respectively, and the Pd/C could be recovered and reused at least 10 times without any loss of catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
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