Photocatalytic selective oxidation of CO with O₂ in the presence of H₂ over highly dispersed chromium oxide on silica under visible or solar light irradiation

Authors: Kamegawa, Takashi¹; Matsuoka, Masaya²; Anpo, Masakazu¹

Source: Research on Chemical Intermediates, Volume 34, Number 4, 2008 , pp. 427-434(8)

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Abstract:

A highly dispersed Cr⁶⁺-oxide species on silica (Cr/SiO₂) was found to act as an efficient photocatalyst for the selective oxidation of CO into CO₂ with O₂ in the presence of H₂ under visible (λ > 420 nm) or solar light irradiation at 293 K. UV-Vis, photoluminescence and FT-IR investigations revealed that the selective reactivity of the photoexcited tetrahedral Cr⁶⁺-oxide species ([Cr⁵⁺-O^-]*) with CO, as well as the high reactivity of the photoreduced Cr⁶⁺-oxide species (Cr⁴⁺-oxide species) with O₂ both play significant roles in this reaction.

Keywords: CR/SIO2; PHOTOCATALYST; SELECTIVE OXIDATION OF CO IN H2; PHOTOLUMINESCENCE

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856708784040614

Affiliations: 1: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan 2: Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan;, Email: matsumac@chem.osakafu-u.ac.jp

Publication date: 2008-04-01