Stoichiometric formation of benzene and ketones by photocatalytic dechlorination of chlorobenzene in secondary alcohol suspensions of palladium-loaded titanium(IV) oxide powder in the presence of sodium ion sources

被引:27
作者
Fuku, Kojirou [1 ]
Hashimoto, Keiji [1 ]
Kominami, Hiroshi [1 ]
机构
[1] Kinki Univ, Fac Sci & Engn, Dept Appl Chem, Osaka 5778502, Japan
关键词
CATALYST; NANOCRYSTALLITES; DEHALOGENATION; DERIVATIVES; 2-PROPANOL;
D O I
10.1039/c0cy00040j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photocatalytic dechlorination of chlorobenzene in alcohol suspensions of metal-loaded TiO(2) in the presence of sodium ion sources under irradiation of UV light was examined. When palladium (Pd) (or rhodium), 2-propanol and NaOH were used as the metal co-catalyst, alcohol and Na(+) source, respectively, benzene and acetone were obtained almost quantitatively and stoichiometrically in a very short time. Chloride ions eliminated from chlorobenzene were immediately solidified as NaCl by NaOH dissolved in 2-propanol and separated from other products such as benzene and acetone dissolved in 2-propanol. Effects of the physical properties of TiO(2) and addition of water on photocatalytic dechlorination of chlorobenzene were examined. A more useful oxidized product, i.e., butanone, was successfully obtained in addition to benzene as the reduction product when 2-butanol was used as the alcohol solvent. To avoid formation of water in dechlorination of chlorobenzene in 2-propanol and 2-butanol, a Na(+)-containing LTA-type zeolite (molecular sieves 4 angstrom) was used as the Na(+) source, and almost quantitative recovery of benzene was achieved along with stoichiometric formation of the corresponding ketones.
引用
收藏
页码:586 / 592
页数:7
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