Photocatalytic Decomposition of NO at 275 K on Titanium Oxides Included within Y-Zeolite Cavities:  The Structure and Role of the Active Sites

Hiromi Yamashita, Yuichi Ichihashi, and Masakazu Anpo*
Department of Applied Chemistry, College of Engineering, Osaka Prefecture University, Gakuen-cho, Sakai, Osaka 593, Japan
Mitsuo Hashimoto
Central Technical Research Laboratory, Nippon Oil Company, Ltd., Chidori-cho, Naka-ku, Yokohama 231, Japan
Catherine Louis and Michel Che
Laboratoire de Ractivit de Surface, Universit P. et M. Curie, UA 1106-CNRS, 4 Place Jussieu, Tour 54, 75252 Paris Cedex 05, France
J. Phys. Chem., 1996, 100 (40), pp 16041–16044
DOI: 10.1021/jp9615969
Publication Date (Web): October 3, 1996
Copyright © 1996 American Chemical Society
*

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

Abstract

Titanium oxide species anchored in the Y-zeolite cavities by an ion-exchange method exhibits a high and unique photocatalytic reactivity for the direct decomposition of NO into N2, O2, and N2O at 275 K with a high selectivity for the formation of N2. The in situ photoluminescence and XAFS (XANES and FT-EXAFS) investigations indicate that the titanium oxide species are highly dispersed in the zeolite cavities and exist in a tetrahedral coordination. The charge-transfer excited state of the titanium oxide species plays a significant role in the direct decomposition of NO with a high selectivity for the formation of N2, while the catalysts involving the aggregated octahedrally coordinated titanium oxide species show a high selectivity to produce N2O, being similar to reactions on the powdered TiO2 catalysts.

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History

  • Published In Issue October 03, 1996
  • Received May 31, 1996
    Revised July 31, 1996

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