Abstract
The Cr-containing mesoporous molecular sieves (Cr-HMS) operated as efficient photocatalyst for the decomposition of NO into N2 and O2 even under visible light irradiation (λ > 450 nm). This photocatalyst exhibited a sharp and intense pre-edge peak in the XANES region which was characteristic of Cr-oxide species in tetrahedral coordination. In the Fourier transform of EXAFS spectrum, only a single peak due to the neighboring oxygen atoms was observed and the curve-fitting analysis indicated that 4-coordinated Cr-oxide moieties having two terminal Cr=O bonds were present. The results obtained with XAFS analysis as well as the analyses with UV-VIS absorption and photoluminescence measurements indicate that the charge transfer excited state of the tetrahedrally coordinated Cr-oxide moieties play a significant role in the photocatalytic reaction under visible light irradiation.
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