| Autor: |
Keiko Kida, Masakazu Anpo, Satoshi Ohshiro, Katsuhiro Yoshizawa, Hiromi Yamashita |
| Rok vydání: |
2005 |
| Předmět: |
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| Zdroj: |
Physica Scripta. :691 |
| ISSN: |
0031-8949 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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