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On the mechanism of NO decomposition on Cu-ZSM-5 catalysts |
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| Authors: | Zolt n Schay, Helmut Kn zinger, L szl Guczi,Gabriela P l-Borb ly |
| Affiliation: | a Department of Surface Chemistry and Catalysis, Institute of Isotope and Surface Chemistry, Chemical Research Center, Hungarian Academy of Sciences, PO Box 77 Budapest H-1525 Hungary b Institute of Physical Chemistry, University of Munich, Sophienstr 11, D-80333 Munich Germany c Institute of Chemistry, Chemical Research Center, Hungarian Academy of Sciences, PO Box 17 Budapest H-1525 Hungary |
| Abstract: | Decomposition of NO was studied on Cu-ZSM-5 catalysts prepared by solid state ion exchange using CuCl2 (I), CuO (II) and by conventional liquid phase ion exchange with copper acetate (III). There was no difference in the catalytic activity among samples (I), (II) and (III) using the same copper loading. Treatment of the samples in argon, in air or in NO/Ar mixture at 700°C was necessary to develop optimum catalytic activity. Transient kinetic experiments using NO carried out under isothermal conditions, showed overshoots in the N2 and O2 concentration at the front and tail edge, respectively. Fourier transform-infrared studies indicated the formation of oxidized copper sites and adsorbed NO2 species during the NO decomposition. In a proposed mechanism Cu2+(O)(NO)(NO2) intermediate was suggested to play a key role in the NO decomposition. |
| Keywords: | NO decomposition on Cu-ZSM-5 Transient kinetic study FTIR of NO and CO |
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