Korean Journal of Chemical Engineering

, Volume 14, Issue 6, pp 498–501 | Cite as

Photocatalytic decomposition of N2O on Cu+/Y-zeolite catalysts prepared by ion-exchange

  • Masakazu Anpo
  • Masaya Matsuoka
  • Kanami Hano
  • Hirotsugu Mishima
  • Takehiko Ono
  • Hiromi Yamashita
Article

Abstract

Insitu characterization of Cu+/Y-zeolite catalysts and their photocatalytic reactivities for the decomposition of N2O into N2 and O2 have been investigated by means ofin situ photoluminescence, XAFS, and ESR techniques along with an analysis of the reaction products. It was found that Cu(I) ions included within the nanopores of Y-zeolite exist as the [Cu(I)--Cu(I)] dimer species as well as the isolated Cu(I) monomer species, their ratio being much dependent on the SiO2/Al2O3 ratio of Y-zeolite. UV irradiation of these Cu+/Y-zeolite catalysts in the presence of N2O led to the photocatalytic decomposition of N2O into N2 and O2 at temperatures as low as 275 K. The electronically excited state of Cu(I) ion (3d94s1 state) plays a vital role in the photocatalytic decomposition of N2O into N2 and O2. The photocatalytic reactivity of these Cu+/zeolite catalysts was found to be strongly affected by the local structure of the Cu(I) ions which could easily be modified by changing the SiO2/Al2O3 ratio of Y-zeolite. The isolated linear 2 coordinated Cu(I) monomer species formed on Y-zeolite having a moderate SiO2/ A12O3 ratio exhibited a high photocatalytic reactivity for the direct decomposition of N2O into N2 and O2, clearly showing the importance of the coordinative unsaturation of the active sites.

Key words

Photocatalyst Photocatalytic Decomposition of N2Copper Ion Y-Zeolite Photoluminescence EXAFS 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anpo, M. and Yamashita, H., “Photochemistry of Surface Species Anchored on Solid Surfaces”, in M. Anpo (editor), Surface Photochemistry, Wiley, West Sussex, 117 (1996).Google Scholar
  2. Anpo, M, Yamashita, H. and Zhang, S., “Photoinduced Surface Chemistry”,Current Opinion in Solid State & Materials Science,1, 219 (1996).Google Scholar
  3. Anpo, M., Matsuoka, M., Mishima, H. and Yamashita, H., “The Design of Photocatalysts for the Removal of NOX at Normal Temperatures --Copper (I) and Silver (I) Ion Catalysts Anchored within Zeolite Cavities “,Res. Chem. Intermed.,23, 197 (1997a).CrossRefGoogle Scholar
  4. Anpo, M., Yamashita, H., Ichihashi, Y., Fujii, Y. and Honda, M.,”Photocatalytic Reduction of CO2 with H2O on Titanium Oxides Anchored within Micropores of Zeolites: Effects of the Structure of the Active Sites and the Addition of Pt”,J. Phys. Chem. B,101, 2632 (1997b).CrossRefGoogle Scholar
  5. Anpo, M., Matsuoka, M., Shioya, Y., Yamashita, H., Giamello, E., Morterra, C, Che, M., Patterson, H. H., Webber, S., Ouellette, S. and Fox, M. A., “The Preparation of the Cu+/ZSM-5 Catalyst and Its Interaction with NO, and Photocatalytic Decomposition of NO into N2 and O2 on the Catalyst at 275K-In Situ Photoluminescence, ESR and FT-IR Investigation-”,J. Phys. Chem.,98, 5744 (1994).CrossRefGoogle Scholar
  6. Barrie, J. D., Dunn, B., Hollingsworth, G. and Zink, J. I., “Optical Spectroscopy of Copper(I)-Doped Na+-Β”-Alumina”,J. Phys. Chem.,93, 3958 (1989).CrossRefGoogle Scholar
  7. Dedecek, J. and Wichterlova, B, “Siting and Redox Behavior of Cu Ions in CuH-ZSM-5 Zeolites”,J.Phys. Chem.,98, 5721 (1994).CrossRefGoogle Scholar
  8. Giamello, E., Murphy, D., Magnacca, G., Morterra, C, Shioya, Y., Nomura T. and Anpo, M., “The Interaction of NO with Copper Ions in ZSM5: An EPR and IR Investigation”,J. Catal,136, 510 (1992).CrossRefGoogle Scholar
  9. Iwamoto, M., Yahiro, H., Mizuno, N., Zhang, W. X., Mine, Y., Furukawa, H. and Kagawa, S., “Removal of Nitrogen Monooxide through a Novel Catalytic Process”,J.Phys. Chem.,96, 9360 (1992).CrossRefGoogle Scholar
  10. Kau, L. S., Hodgson, K. O. and Solomon, E. I., “X-ray Absorption Edge and EXAFS Study of the Copper Sites in ZnO Methanol Synthesis Catalysts”,J.Am. Chem. Soc,111, 103 (1989).CrossRefGoogle Scholar
  11. Li, Y. and Hall, W. K, “Stoichiometric Catalytic Decomposition of Nitric Oxide over Cu-ZSM-5 Catalysts”,J.Phys. Chem.,94, 6145 (1990).CrossRefGoogle Scholar
  12. Strome, D. H. and Klier, K., “The Effect of Oxygen on Photoluminescence and Resonance Energy Transfer in Cu(I) Y Zeolite”,J.Phys. Chem.,84, 981 (1980).CrossRefGoogle Scholar
  13. Yamashita, H., Ichihashi, Y., Anpo, M., Hashimoto, M., Louis, C. and Che, M., “Photocatalytic Decomposition of NO at 275 K on Titanium Oxides Included within Y-Zeolites Cavities: The Structure and Role of the Active Sites”,J.Phys. Chem.,100, 16041 (1996a).CrossRefGoogle Scholar
  14. Yamashita, H., Matsuoka, M., Tsuji, K., Shioya, Y. and Anpo, M., “InSitu XAFS, Photoluminescence, and IR Investigations of Copper Ions Included within Various Kinds of Zeolites-The Structure of Cu(I) Ions and Their Interaction with CO Molecules-”,J. Phys. Chem.,100, 397 (1996b).CrossRefGoogle Scholar

Copyright information

© Korean Institute of Chemical Engineering 1997

Authors and Affiliations

  • Masakazu Anpo
    • 1
  • Masaya Matsuoka
    • 1
  • Kanami Hano
    • 1
  • Hirotsugu Mishima
    • 1
  • Takehiko Ono
    • 1
  • Hiromi Yamashita
    • 1
  1. 1.Department of Applied Chemistry, College of EngineeringOsaka Prefecture UniversityOsakaJapan

Personalised recommendations