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DeNOx reactions on Cu-zeolites Decomposition of NO, N2O and SCR of NO by C3H8 and CH4 on Cu-ZSM-5 and Cu-AlTS-1 catalysts |
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| Authors: | Z Schay L Guczi A Beck I Nagy V Samuel S P Mirajkar A V Ramaswamy and G 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, P.O. Box 77, H-1525 Budapest, Hungary b National Chemical Laboratory, 411 008 Pune, India c Chemical Institute, CRC, HAS, P.O. Box 17, H-1525 Budapest, Hungary |
| Abstract: | Cu-ZSM-5 and Cu-AlTS-1 catalysts were prepared by solid state ion exchange and studied in DeNOx reactions. A NO3 type surface complex was found to be an active intermediate in the decomposition of NO and N2O. Copper was oxidized to Cu2+ in the decomposition reactions. Oscillations at full N2O conversion were observed in the gas phase O2 concentration, without any change in the N2 concentration. The oscillation was synchronized by gas phase NO formed from the NO3 complex. The same complex seems to be an active intermediate also in NO selective catalytic reduction (SCR) by methane, whereas carbonaceous deposits play a role in NO SCR by propane. TPD reveals that only 10–20% of the total copper in the zeolites participates in the catalytic cycles. |
| Keywords: | Zeolite NO N2O Transients Oscillations SCR |
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