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Chen, Peirong ; Jabłońska, Magdalena ; Weide, Philipp ; Caumanns, Tobias ; Weirich, Thomas ; Muhler, Martin ; Moos, Ralf ; Palkovits, Regina ; Simon, Ulrich:
Formation and Effect of NH₄⁺ Intermediates in NH₃-SCR over Fe-ZSM-5 Zeolite Catalysts.
In: ACS Catalysis.
Bd. 6
(2016)
.
- S. 7696-7700.
ISSN 2155-5435
DOI: https://doi.org/10.1021/acscatal.6b02496
Angaben zu Projekten
| Projekttitel: |
Offizieller Projekttitel Projekt-ID Ohne Angabe MO 1060/19-1 |
|---|---|
| Projektfinanzierung: |
Deutsche Forschungsgemeinschaft |
Abstract
With the help of a technique combining in situ electrical impedance spectroscopy and DRIFT spectroscopy, we observed directly the formation of ammonium ion (NH4+) intermediates resulting from the interaction of NO and NH3 on Fe-ZSM-5 catalysts for selective catalytic reduction by NH3 (NH3–SCR). The formed NH4+ intermediates, indicating the activation of NO in the presence of adsorbed NH3, were found to be strongly related to the NH3–SCR activity of Fe-ZSM-5 catalysts at low temperatures. These findings, which are not easily achievable by conventional methods, provide new and important perspectives to understand mechanistically the NH3–SCR reaction over Fe-zeolite catalysts.