Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 30, Issue 2, Pages 235-245Publisher
SPRINGER
DOI: 10.1163/156856704322960781
Keywords
partial oxidation; mesoporous silica; chromium; UV-Vis spectroscopy; Cr-HMS
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The photocatalytic reactivities of chromium-containing mesoporous silica molecular sieves (Cr-HMS) under visible light irradiation have been investigated. Cr-HMS involves tetrahedral chromium oxide (Cr-oxide) moieties which are highly dispersed and incorporated in the framework of molecular sieve with two terminal Cr=O groups. In the presence of propane with molecular oxygen, a partial oxidation proceeded under visible light irradiation to produce acetone and acrolein, with high selectivity, while a complete oxidation proceeded under UV light irradiation mainly to produce CO(2). The charge-transfer excited state of the tetrahedral Cr-oxide moieties plays a significant role in the photocatalytic reactions.
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