期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 169, 期 1-3, 页码 1029-1033出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.04.043
关键词
Catalytic hydrodechlorination; Pd/C; Chlorophenols; Aqueous solutions; Solvent effect
资金
- National Key Technology R&D Program of China [2008BAC32B03]
- Chinese Academy of Sciences [KZCX2-YW-Q07-04]
- Yantai Science and Technology Bureau [2008155]
Catalytic hydrotreating of chlorophenols was carried out in water with Pd/C at 25 degrees C under atmospheric pressure. 1.0% (w/w) monocholophenols was completely dechlorinated within 60 min. Phenol, cyclohexanone and cyclohexanol were formed. In contrast to the dechlorination of monochlorophenols, the hydrogenation reaction of polychlorinated phenols became difficult and reaction rates were strongly dependent upon the number of the chlorine atoms. The solvent property had a considerably important influence on the dechlorination reaction. Water as a solvent showed more advantages than organic solvents. It was much easier to be hydrodechlorinated for chlorophenols in aqueous solutions. However, the presence of THF, dioxane, DMSO or DMF in water was disadvantageous to the reaction and easily to cause Pd/C deactivation. Additionally, when different halogenated organic compounds were present in aqueous solution, the dehalogenation reaction was the competitive hydrogenation process. (c) 2009 Elsevier B.V. All rights reserved.
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