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Portrait of Reine Wallenberg. Photo: Kennet Ruona

Reine Wallenberg

Professor, Coordinator Materials Science

Portrait of Reine Wallenberg. Photo: Kennet Ruona

Performance of ZrO2-supported Nb- and W-oxide in the gas-phase dehydration of glycerol to acrolein

Author

  • Mariano Massa
  • Arne Andersson
  • Elisabetta Finocchio
  • Guido Busca
  • Filip Lenrick
  • Reine Wallenberg

Summary, in English

Gas-phase dehydration of glycerol to acrolein is studied over tungsten and niobium oxide supported on monoclinic zirconia. Supported tungsten oxide is slightly better than supported niobia with initial yields to acrolein around 78% and 75%, respectively, at complete conversion of glycerol. No synergy is observed using mixed structures with W and Nb. The addition of oxygen to the feed has almost no effect on the yield to acrolein but reduces the deactivation rate. XPS and HRTEM imaging reveals that deactivation is due to formation of an amorphous layer on the surface, consisting of adsorbed high-boiling compounds and coke. Regeneration experiments show that the catalysts are effectively regenerated in flowing air. Characterization of the catalysts with Raman, FTIR, and pyridine adsorption reveals that the active surface structure is polymeric oxide exposing W=O and/or Nb=O species and Bronsted acidic W OH and/or Nb OH groups. The results show that Bronsted acidic sites are required for the catalyst to be active and selective to acrolein. (c) 2012 Elsevier Inc. All rights reserved.

Department/s

  • Department of Chemical Engineering
  • Centre for Analysis and Synthesis

Publishing year

2013

Language

English

Pages

93-109

Publication/Series

Journal of Catalysis

Volume

297

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Engineering
  • Chemical Sciences

Keywords

  • Glycerol
  • Dehydration
  • Oxidative dehydration
  • Acrolein
  • Acrylic acid
  • WO3/ZrO2
  • Nb2O5/ZrO2
  • Nb-W-O/ZrO2
  • Deactivation
  • Regeneration

Status

Published

ISBN/ISSN/Other

  • ISSN: 1090-2694