【Note】
Dechlorination of 4-Chlorobiphenyl and Chlobenzene over Supported Palladium Catalysts
Yuji Ukisu* and Tatsuo Miyadera*
* National Institute of Advanced Industrial Science and Technology（AIST）
† Correspondence should be addressed to Yuji Ukisu:
（16-1 Onogawa, Tsukuba, Ibaraki, 305-8569 Japan）

Abstract
Catalytic dechlorination of 4-chlorobiphenyl（4-CBp）and chlorobenzene（CBz）was carried out at 35℃ in a solution of NaOH in 2-propanol in the presence of a supported palladium catalyst（Pd/C or Pd/Al2O3）. In the individual substrate reaction, the initial dechlorination rate of CBz was much faster than that of 4-CBp by a factor of 3.4. When they were mixed, the dechlorination rate of CBz was suppressed and was slower than that of 4-CBp. Since 4-CBp preferably adsorbs on the catalyst in the presence of CBz, the adsorption abilities of substrates seem to affect the reaction rate in the competitive reaction.

Key words: chlorobiphenyl, chlorobenzene, dechlorination, competitive reaction, palladium catalyst