Kantcheva, Margarita and Agiral, A. and Samarskaya, O. and Stranzenbach, Mathias and Saruhan, Bilge (2005) Characterization of LaMnAl11O19 by FT-IR Spectroscopy of Adsorbed NO and NO/O2,. Applied Surface Science, 252 (5), pp. 1481-1491.
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Abstract
The nature of the NOx species produced during the adsorption of NO at room temperature and during its coadsorption with oxygen on LaMnAl11O19 sample with magnetoplumbite structure obtained by a sol-gel process has been investigated by means of in situ FT-IR spectroscopy. The adsorption of NO leads to formation of anionic nitrosyls and/or cis-hyponitrite ions and reveals the presence of two types of coordinatively unsaturated Mn3+ ions. Upon NO/O2 adsorption at room temperature various nitro-nitrato structures are observed. The nitro-nitrato species produced with the participation of electrophilic oxygen species decompose at 3500C directly to N2 and O2. No NO decomposition is observed in absence of oxygen. The adsorbed nitro-nitrato species are inert toward the interaction with methane and block the active sites (Mn3+ ions) for its oxidation. Noticeable oxidation of the methane on the NOx-precovered sample is observed at temperatures higher than 3500C due to the liberation of the active sites as a result of decomposition of the surface nitro-nitrato species. A mechanism explaining the promoting effect of the molecular oxygen in the NO decomposition is proposed.
Item URL in elib: | https://elib.dlr.de/19895/ | ||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||
Title: | Characterization of LaMnAl11O19 by FT-IR Spectroscopy of Adsorbed NO and NO/O2, | ||||||||||||||||||||||||
Authors: |
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Date: | 2005 | ||||||||||||||||||||||||
Journal or Publication Title: | Applied Surface Science | ||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||
Volume: | 252 | ||||||||||||||||||||||||
Page Range: | pp. 1481-1491 | ||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||
Keywords: | Catalyst, NOx-reduction | ||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||||||||||||||
HGF - Program: | Aeronautics | ||||||||||||||||||||||||
HGF - Program Themes: | Propulsion Systems (old) | ||||||||||||||||||||||||
DLR - Research area: | Aeronautics | ||||||||||||||||||||||||
DLR - Program: | L VU - Air Traffic and Environment | ||||||||||||||||||||||||
DLR - Research theme (Project): | L - Low-Emission Air Traffic (old) | ||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Research > High Temperature and Functional Coatings | ||||||||||||||||||||||||
Deposited By: | Saruhan-Brings, Dr. Bilge | ||||||||||||||||||||||||
Deposited On: | 02 Dec 2005 | ||||||||||||||||||||||||
Last Modified: | 27 Apr 2009 04:44 |
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