No abstract

No abstract

The photocatalytic reactivities of chromium oxide (Cr-oxide) loaded on zeolites and mesoporous molecular sieves by an impregnation method have been investigated. The Cr-oxide impregnated on mesoporous silica (imp-Cr/HMS) involves tetrahedrally-coordinated Cr-oxide moieties with two terminal Cr=O. The imp-Cr/zeolite contains a mixture of tetrahedrallyand octahedrally-coordinated Cr-oxide species (Cr 2 O 3 -like cluster). In the presence of propane and O 2 , a partial oxidation of propane with a high selectivity for acetone formation proceeded on imp-Cr/HMS under visible light irradiation, while a low reactivity was observed on imp-Cr/zeolites. The charge transfer excited state of the tetrahedrally-coordinated Cr-oxide moieties plays a significant role in the photocatalytic reactions.

No abstract

No abstract