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Issue 4, 2011
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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 sodiumion sources

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Abstract

Photocatalytic dechlorination of chlorobenzene in alcohol suspensions of metal-loaded TiO2 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 TiO2 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 Å) was used as the Na+ source, and almost quantitative recovery of benzene was achieved along with stoichiometric formation of the corresponding ketones.

Graphical abstract: 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

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Publication details

The article was received on 05 Nov 2010, accepted on 19 Jan 2011 and first published on 16 Feb 2011


Article type: Paper
DOI: 10.1039/C0CY00040J
Catal. Sci. Technol., 2011,1, 586-592

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    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

    K. Fuku, K. Hashimoto and H. Kominami, Catal. Sci. Technol., 2011, 1, 586
    DOI: 10.1039/C0CY00040J

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