Journal
RESEARCH ON CHEMICAL INTERMEDIATES
Volume 29, Issue 7-9, Pages 881-890Publisher
SPRINGER
DOI: 10.1163/156856703322601870
Keywords
photocatalysis; zeolite; mesoporous silica; chromium oxide; partial oxidation
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Chromium oxide (Cr-oxide) moieties loaded on ZSM-5 zeolites and HMS mesoporous silica molecular sieves were prepared by an impregnation method and characterized by various spectroscopic methods (XRD, XAFS, UV-Vis, photoluminescence) and their photocatalytic reactivities for partial oxidation of propane under visible light irradiation were investigated. The local structure of Cr-oxide species depended to a large extent on the zeolite types and SUM ratios of zeolites. Tetrahedrally-coordinated isolated Cr-oxide moieties can be loaded on HMS and ZSM-5 having the higher SUM ratios. On these catalysts, in the presence of propane and 02, a partial oxidation proceeded under visible light irradiation to produce acetone with high selectivity. The charge-transfer excited state of the tetrahedral Cr-oxide moieties plays a significant role in the selective photocatalytic reactions under visible light irradiation.
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