Visible-light-sensitive photocatalytic reaction on chromium-containing mesoporous silica: selective partial oxidation of propane with molecular oxygen

Authors: Yamashita H.; Ariyuki M.; Yoshizawa K.; Kida K.; Ohshiro S.; Anpo M.

Source: Research on Chemical Intermediates, Volume 30, Number 2, 2004 , pp. 235-245(11)

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Abstract:

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 CO₂. The charge-transfer excited state of the tetrahedral Cr-oxide moieties plays a significant role in the photocatalytic reactions.

Keywords: PARTIAL OXIDATION; MESOPOROUS SILICA; CHROMIUM; UV-VIS SPECTROSCOPY; CR-HMS

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856704322960781

Publication date: 2004-03-01