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
Tóm tắt
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.
Tài liệu tham khảo
B. M. Weckhuysen and R. A. Schoonheydt, Catal. Today 51, 215 (1999).
E. Groppo, C. Lamberti, S. Bordiga, G. Spoto and A. Zecchina, Chem. Rev. 105, 115 (2005).
H. Yamashita, K. Yoshizawa, M. Ariyuki, S. Higashimoto, M. Che and M. Anpo, Chem. Commun., 435 (2001).
H. Yamashita and M. Anpo, Curr. Opin. Solid State Mater. Sci. 7, 471 (2003).
C. Murata, H. Yoshida and T. Hattori, Chem. Commun., 2412 (2001).
T. Kamegawa, M. Morishima, M. Matsuoka, J. M. Thomas and M. Anpo, J. Phys. Chem. C 111, 1076 (2007).
M. Anpo and J. M. Thomas, Chem. Commun., 3273 (2006).
Y. Hu, S. Higashimoto, G. Martra, J. L. Zhang, M. Matsuoka, S. Coluccia and M. Anpo, Catal. Lett. 90, 161 (2003).
M. Anpo, S. Higashimoto, M. Matsuoka, N. Zhanpeisov, Y. Shioya, S. Dzwigaj and M. Che, Catal. Today 78, 211 (2003).
T. Kamegawa, R. Takeuchi, M. Matsuoka and M. Anpo, Catal. Today 111, 248 (2006).
M. Echigo and T. Tabata, Appl. Catal. A 251, 157 (2003).
A. Siani, B. Captain, O. S. Alexeev, E. Stafyla, A. B. Hungria, P. A. Midgley, J. M. Thomas, R. D. Adams and M. D. Amiridis, Langmuir 22, 5160 (2006).
B. M. Weckhuysen, A. A. Verberckmoes, A. L. Buttiens and R. A. Schoonheydt, J. Phys. Chem. B 98, 579 (1994).
M. Anpo, I. Tanahashi and Y. Kubokawa, J. Phys. Chem. 86, 1 (1982).
M. F. Hazenkamp and G. Blasse, J. Phys. Chem. 96, 3442 (1992).
S. D. Kohler and J. G. Ekerdt, J. Phys. Chem. 98, 4336 (1994).
N. J. Turro, Modern Molecular Photochemistry. Benjamin/Cummings, New York, NY (1978).
M. Anpo and M. Che, Adv. Catal. 44, 119 (1999).