The photo-oxidation of glycerol in aqueous suspensions containing commercial and home-prepared TiO2 samples in the anatase, rutile or anatase–rutile polymorphic phases was investigated by using two different batch photoreactors, an annular photoreactor and a cylindrical photoreactor. The glycerol oxidation products detected in the aqueous phase were: 1,3-dihydroxyacetone, glyceraldehyde, formic acid and carbon dioxide. Two unknown compounds were also detected by electrospray ionization mass spectrometry as peaks at m/z 268 and m/z 176. A plausible mechanism for their formation was suggested based on ESI-MS and MSn experiments. The results indicate that in both systems the commercial samples showed the best performances both for reaction rate and selectivity toward 1,3-dihydroxyacetone, glyceraldehyde, formic acid and CO2.
Augugliaro, V., El Nazer, H.H., Loddo, V., Mele, A., Palmisano, G., Palmisano, L., et al. (2010). Partial Photocatalytic Oxidation of Glycerol in TiO2 Water Suspensions. CATALYSIS TODAY, 151, 21-28 [10.1016/j.cattod.2010.01.022].
Partial Photocatalytic Oxidation of Glycerol in TiO2 Water Suspensions
AUGUGLIARO, Vincenzo;LODDO, Vittorio;PALMISANO, Giovanni;PALMISANO, Leonardo;
2010-01-01
Abstract
The photo-oxidation of glycerol in aqueous suspensions containing commercial and home-prepared TiO2 samples in the anatase, rutile or anatase–rutile polymorphic phases was investigated by using two different batch photoreactors, an annular photoreactor and a cylindrical photoreactor. The glycerol oxidation products detected in the aqueous phase were: 1,3-dihydroxyacetone, glyceraldehyde, formic acid and carbon dioxide. Two unknown compounds were also detected by electrospray ionization mass spectrometry as peaks at m/z 268 and m/z 176. A plausible mechanism for their formation was suggested based on ESI-MS and MSn experiments. The results indicate that in both systems the commercial samples showed the best performances both for reaction rate and selectivity toward 1,3-dihydroxyacetone, glyceraldehyde, formic acid and CO2.
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