elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

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.

Full text not available from this repository.

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/
Document Type:Article
Title:Characterization of LaMnAl11O19 by FT-IR Spectroscopy of Adsorbed NO and NO/O2,
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kantcheva, MargaritaUniversität Bilkent, Ankara, TurkeiUNSPECIFIED
Agiral, A.Universität Bilkent, Ankara, TurkeiUNSPECIFIED
Samarskaya, O.Universität Bilkent, Ankara, TurkeiUNSPECIFIED
Stranzenbach, MathiasUNSPECIFIEDUNSPECIFIED
Saruhan, BilgeUNSPECIFIEDUNSPECIFIED
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.