Ti and Si doping as a way to increase low temperature activity of sulfated Ag/Al2O3 in H2-assisted NH3-SCR of NOx

Dmitry E. Doronkin, Sebastian Fogel, Pär Gabrielsson, Jan-Dierk Grunwaldt, Søren Dahl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ag/Al2O3 catalysts modified by Si, Ti, Mg and W were studied to obtain higher NOx SCR activity and potentially also higher SO2 resistance than the pure silver-based catalyst for automotive applications. Addition of Ti or Si to the alumina support leads to a better NOx removal at low temperature i.e. reduces the SCR onset temperature by about 10°C under the applied conditions. However, it does not increase the SO2 resistance. The catalysts and the supports have been characterized by BET, conventional and synchrotron XRD, X-ray absorption spectroscopy during temperature-programmed reduction (XAS-TPR) and temperature-programmed desorption of ammonia (NH3-TPD). The obtained results suggest a better silver dispersion and better regeneration capability in the case of Ti- and Si-modified Ag/Al2O3 catalysts.

Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume148-149
Pages (from-to)62-69
ISSN0926-3373
DOIs
Publication statusPublished - 2013

Keywords

  • Alumina
  • Catalyst regeneration
  • Doping (additives)
  • Silicon
  • Silver
  • Sulfur dioxide
  • Temperature
  • Temperature programmed desorption
  • X ray absorption spectroscopy
  • Catalyst supports

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