Journal
ACS CATALYSIS
Volume 6, Issue 11, Pages 7696-7700Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.6b02496
Keywords
ammonium ion intermediates; NO activation; proton transport; redox cycle; NH3-SCR mechanism
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Funding
- German Research Foundation (DFG) [MO 1060/19-1, SI 609/14-1]
- Exploratory Research Space of RWTH Aachen University - Excellence Initiative of the German federal and state governments
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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.
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