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Characterization of LaMnAl11O19 by FT-IR Spectroscopy of Adsorbed NO and NO/O2,

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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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/
Document Type:Article
Title:Characterization of LaMnAl11O19 by FT-IR Spectroscopy of Adsorbed NO and NO/O2,
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kantcheva, MargaritaUniversität Bilkent, Ankara, TurkeiUNSPECIFIEDUNSPECIFIED
Agiral, A.Universität Bilkent, Ankara, TurkeiUNSPECIFIEDUNSPECIFIED
Samarskaya, O.Universität Bilkent, Ankara, TurkeiUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Applied Surface Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1481-1491
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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