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Issue
Korean Journal of Chemical Engineering,
Vol.14, No.6, 498-501, 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
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[Cited By]
  1. Wang L, Kim CN, Korean Journal of Chemical Engineering, 18(5), 652, 2001
  2. Chai YS, Lee JC, Kim BW, Korean Journal of Chemical Engineering, 17(6), 633, 2000
  3. Anpo M, Matsuoka M, Yamashita H, Ju WS, Park SE, Shul YG, Journal of Industrial and Engineering Chemistry, 6(3), 133, 2000
  4. Xianyu WX, Park MK, Lee WI, Korean Journal of Chemical Engineering, 18(6), 903, 2001
  5. You YS, Chung KH, Kim JH, Seo G, Korean Journal of Chemical Engineering, 18(6), 924, 2001
  6. Lee DK, Korean Journal of Chemical Engineering, 23(4), 547, 2006
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