Ti-pillared montmorillonite clays (Ti-PILCs) have been investigated as photocatalysts for the selective oxygenation of the following liquid alkylaromatics: toluene, para-xylene and ortho-xylene. The photocatalytic processes occur using O2 as oxidizing species, upon near UV light, in mild pressure and temperature conditions and with good stability of the catalytic materials. Accumulation of valuable carbonylic derivatives is possible since their over-oxidation to carbon dioxide is negligible. In particular, proper reaction conditions are found for obtaining carbonylic compounds with about 90% selectivity, which is significantly higher than that obtained when the same experiments are carried out with commercial TiO2 Degussa P25. Detailed results on the chemical–physical characterization of these materials are also presented.
Photocatalysis with TiO2-pillared clays for the oxofunctionalization of alkylaromatics by O2
MOLINARI, Alessandra;MALDOTTI, Andrea
2009
Abstract
Ti-pillared montmorillonite clays (Ti-PILCs) have been investigated as photocatalysts for the selective oxygenation of the following liquid alkylaromatics: toluene, para-xylene and ortho-xylene. The photocatalytic processes occur using O2 as oxidizing species, upon near UV light, in mild pressure and temperature conditions and with good stability of the catalytic materials. Accumulation of valuable carbonylic derivatives is possible since their over-oxidation to carbon dioxide is negligible. In particular, proper reaction conditions are found for obtaining carbonylic compounds with about 90% selectivity, which is significantly higher than that obtained when the same experiments are carried out with commercial TiO2 Degussa P25. Detailed results on the chemical–physical characterization of these materials are also presented.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
