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      NOx reduction on a transition metal-free γ-Al2O3 catalyst using dimethylether (DME)

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      Author(s)
      Ozensoy, E.
      Herling, D.
      Szanyi, J.
      Date
      2008
      Source Title
      Catalysis Today
      Print ISSN
      0920-5861
      Volume
      136
      Issue
      1-2
      Pages
      46 - 54
      Language
      English
      Type
      Article
      Item Usage Stats
      182
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      181
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      Abstract
      NO2 and dimethylether (DME) adsorption as well as DME and NO2 co-adsorption on a transition metal-free γ-alumina catalyst were investigated via in-situ transmission Fourier transform infrared spectroscopy (in-situ FTIR), residual gas analysis (RGA) and temperature programmed desorption (TPD) techniques. NO2 adsorption at room temperature leads to the formation of surface nitrates and nitrites. DME adsorption on the alumina surface at 300 K leads to molecularly adsorbed DME, molecularly adsorbed methanol and surface methoxides. Upon heating the DME-exposed alumina to 500-600 K the surface is dominated by methoxide groups. At higher temperatures methoxide groups are converted into formates. At T > 510 K, formate decomposition takes place to form H2O(g) and CO(g). DME and NO2 co-adsorption at 423 K does not indicate a significant reaction between DME and NO2. However, in similar experiments at 573 K, fast reaction occurs and the methoxides present at 573 K before the NO2 adsorption are converted into formates, simultaneously with the formation of isocyanates. Under these conditions, NCO can further be hydrolyzed into isocyanic acid or ammonia with the help of water which is generated during the formate formation, decomposition and/or NCO formation steps. © 2008 Elsevier B.V. All rights reserved.
      Keywords
      Al2O3
      Formate
      FTIR
      Methanol
      Methoxy
      Nitrate
      Nitrite
      NO2
      NOx reduction
      SCR
      TPD
      Alumina
      Catalysts
      Fourier transform infrared spectroscopy
      Nitrogen oxides
      Reduction
      Temperature programmed desorption
      Dimethylether (DME)
      Residual gas analysis
      Solid acid catalysts
      Ethers
      Permalink
      http://hdl.handle.net/11693/23061
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.cattod.2007.12.095
      Collections
      • Department of Chemistry 677
      • Institute of Materials Science and Nanotechnology (UNAM) 2098
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