Photocatalytic Decomposition of N<SUB>2</SUB>O on Cu<SUP>+</SUP>/Y-Zeolite Catalysts Prepared by Ion-Exchange

Anpo M; Matsuoka M; Hano K; Mishima H; Ono T; Yamashita H

Korean Journal of Chemical Engineering, Vol.14, No.6, 498-501, November, 1997

Photocatalytic Decomposition of N₂O on Cu⁺/Y-Zeolite Catalysts Prepared by Ion-Exchange

Anpo M, Matsuoka M, Hano K, Mishima H, Ono T, Yamashita H

In situ characterization of Cu⁺/Y-zeolite catalysts and their photocatalytic reactivities for the decomposition of N₂O into N₂ and O₂ have been investigated by means of in 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/Al₂O₃ ration 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.

Keywords:Photocatalyst;Phtocatalytic Decomposition of N₂O;Copper Ion;Y-Zeolite;Photoluminescence;EXAFS

[References]

Anpo M, Yamashita H, "Photochemistry of Surface Species Anchored on Solid Surfaces," in M. Anpo (editor), Surface Photochemistry, Wiley, West Sussex, 117 (1996)
Anpo M, Yamashita H, Zhang S, Curr. Opin. Solid State Mater. Sci., 1, 219 (1996)
Anpo M, Matsuoka M, Mishima H, Yamashita H, Res. Chem. Intermed., 23, 197 (1997)
Anpo M, Yamashita H, Ichihashi Y, Fujii Y, Honda M, J. Phys. Chem. B, 101(14), 2632 (1997)
Anpo M, Matsuoka M, Shioya Y, Yamashita H, Giamello E, Morterra C, Che M, Patterson HH, Webber S, Ouellette S, Fox MA, J. Phys. Chem., 98(22), 5744 (1994)
Barrie JD, Dunn B, Hollingsworth G, Zink JL, J. Phys. Chem., 93, 3958 (1989)
Dedecek J, Wichterlova B, J. Phys. Chem., 98(22), 5721 (1994)
Giamello E, Murphy D, Magnacca G, Morterra C, Shioya Y, Nomura T, Anpo M, J. Catal., 136, 510 (1992)
Iwamoto M, Yahiro H, Mizuno N, Zhang WX, Mine Y, Furukawa H, Kagawa S, J. Phys. Chem., 96, 9360 (1992)
Kau LS, Hodgson KO, Solomon EI, J. Am. Chem. Soc., 111, 103 (1989)
Li Y, Hall WK, J. Phys. Chem., 94, 6145 (1990)
Strome DH, Klier K, J. Phys. Chem., 84, 981 (1980)
Yamashita H, Ichihashi Y, Anpo M, Hashimoto M, Louis C, Che M, J. Phys. Chem., 100(40), 16041 (1996)
Yamashita H, Matsuoka M, Tsuji K, Shioya Y, Anpo M, Che M, J. Phys. Chem., 100(1), 397 (1996)

[Referenced By]

[1] Anpo M, Yamashita H, "Photochemistry of Surface Species Anchored on Solid Surfaces," in M. Anpo (editor), Surface Photochemistry, Wiley, West Sussex, 117 (1996)

[2] Anpo M, Yamashita H, Zhang S, Curr. Opin. Solid State Mater. Sci., 1, 219 (1996)

[3] Anpo M, Matsuoka M, Mishima H, Yamashita H, Res. Chem. Intermed., 23, 197 (1997)

[4] Anpo M, Yamashita H, Ichihashi Y, Fujii Y, Honda M, J. Phys. Chem. B, 101(14), 2632 (1997)

[5] Anpo M, Matsuoka M, Shioya Y, Yamashita H, Giamello E, Morterra C, Che M, Patterson HH, Webber S, Ouellette S, Fox MA, J. Phys. Chem., 98(22), 5744 (1994)

[6] Barrie JD, Dunn B, Hollingsworth G, Zink JL, J. Phys. Chem., 93, 3958 (1989)

[7] Dedecek J, Wichterlova B, J. Phys. Chem., 98(22), 5721 (1994)

[8] Giamello E, Murphy D, Magnacca G, Morterra C, Shioya Y, Nomura T, Anpo M, J. Catal., 136, 510 (1992)

[9] Iwamoto M, Yahiro H, Mizuno N, Zhang WX, Mine Y, Furukawa H, Kagawa S, J. Phys. Chem., 96, 9360 (1992)

[10] Kau LS, Hodgson KO, Solomon EI, J. Am. Chem. Soc., 111, 103 (1989)

[11] Li Y, Hall WK, J. Phys. Chem., 94, 6145 (1990)

[12] Strome DH, Klier K, J. Phys. Chem., 84, 981 (1980)

[13] Yamashita H, Ichihashi Y, Anpo M, Hashimoto M, Louis C, Che M, J. Phys. Chem., 100(40), 16041 (1996)

[14] Yamashita H, Matsuoka M, Tsuji K, Shioya Y, Anpo M, Che M, J. Phys. Chem., 100(1), 397 (1996)