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Chemo- and Regio-Selectivity in the TiO2-Mediated Photooxidation of 1,n-diols
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Alessandra Molinari
Published/Copyright:
December 8, 2016
Abstract
Proper reaction conditions have been found for the conversion of 1,2 propanediol, 1,3 butanediol and 1,4 pentanediol to the corresponding hydroxy-carbonylic compounds with good chemo- and regio-selectivity by photochemical excitation of CH2Cl2 suspensions of TiO2. In particular, about 90% of hydroxyacetone from 1,2 propanediol and more than 75% of 4-hydroxypentanal from 1,4 pentanediol could be obtained. A remarkable conclusion is that the TiO2-assisted photooxidation of 1,4-pentanediol is carried out with good selectivity to 4-hydroxypentanal and low mineralization to CO2 also under high conversion conditions. The adsorption of the diol on the semiconductor is an important parameter able to affect efficiency and selectivity of the photocatalytic process. In particular, the high polarity of the TiO2 surface favours the preferential adsorption of the primary OH group of the diol molecule, thus favouring its subsequent oxidation.
Received: 2007-9-10
Revised: 2007-11-5
Accepted: 2007-11-6
Published Online: 2016-12-8
Published in Print: 2008-1-1
© 2016 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- An Integral Degradation Model to Describe H2O2-Photooxidation of Linear Alkylbenzenesulfonate (LAS) Surfactants
- Characterization of the Radical Oxidative Level in the Degradation of Phenolic Compounds with H2O2/UV
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- Photocatalytic Activity of W-Doped TiO2 Nanopowders
- Catalytic Wet Peroxide Oxidation Process for the Continuous Treatment of Polluted Effluents on a Pilot Plant Scale
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