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      Characterization of LaMnAl11O19 by FT-IR spectroscopy of adsorbed NO and NO/O2

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      Author(s)
      Kantcheva, M.
      Agiral, A.
      Samarskaya, O.
      Stranzenbach, M.
      Saruhan, B.
      Date
      2005-12-15
      Source Title
      Applied Surface Science
      Print ISSN
      0169-4332
      Publisher
      Elsevier
      Volume
      252
      Issue
      5
      Pages
      1481 - 1491
      Language
      English
      Type
      Article
      Item Usage Stats
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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 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 350 8C directly to N2 and O2. No NO decomposition is observed in absence of molecular oxygen. The adsorbed nitro–nitrato species are inert towards 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 350 8C due to the liberation of the active sites as a result of decomposition of the surface nitro–nitrato species. Mechanism explaining the promoting effect of the molecular oxygen in the NO decomposition is proposed. (c)2005 Elsevier B.V. All rights reserved.
      Keywords
      LaMnAl11O19
      Sol - gel synthesis
      In situ FT - IR spectroscopy
      Adsorption of NO and NO/O2
      Reactivity of stable NOx species
      NO decomposition
      Permalink
      http://hdl.handle.net/11693/11449
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.apsusc.2005.02.139
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