Visible-light-responsive photocatalytic reaction on tetrahedrally-coordinated chromium oxide moieties loaded on ZSM-5 zeolites and HMS mesoporous silica: partial oxidation of propane

Autor:	Hiromi Yamashita, Keiko Kida, Masakazu Anpo, Katsuhiro Yoshizawa, Satoshi Ohshiro
Rok vydání:	2003
Předmět:	Materials science Inorganic chemistry Photocatalysis General Chemistry Partial oxidation ZSM-5 Mesoporous silica Zeolite Photochemistry Molecular sieve Catalysis Visible spectrum
Zdroj:	Research on Chemical Intermediates. 29:881-890
ISSN:	1568-5675 0922-6168
Popis:	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 Si/A1 ratios of zeolites. Tetrahedrally-coordinated isolated Cr-oxide moieties can be loaded on HMS and ZSM-5 having the higher Si/A1 ratios. On these catalysts, in the presence of propane and O2, 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dffeca4f2ed329b3c98637e44f104c52 https://doi.org/10.1163/156856703322601870 Zobrazit plný text záznamu Plný text ve formátu PDF