XAFS Studies of Copper/ Zeolite Catalysts for NOx Reduction
- 1 January 1993
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 32 (S2)
- https://doi.org/10.7567/jjaps.32s2.487
Abstract
XANES and EXAFS of Cu ion-exchanged zeolite catalysts effective for selective reduction of NOx by hydrocarbons have been studied by using a laboratory EXAFS spectrometer. The structural change of Cu species during catalytic reaction is suggested from the changes of Cu-Cu interaction peaks in EXAFS Fourier transforms and of the peaks due to multiple scattering in XANES spectra. Copper ions before reaction exist as isolated ions at the ion-exchanging sites, while Cu atoms in deactivated catalyst are sintered to form cluster species.Keywords
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