An investigation of the thermal stability and sulphur tolerance of Ag/Y-Al2O3 catalysts for the SCR of NOx with hydrocarbons and hydrogen

J. P. Breen*, R. Burch, C. Hardacre, C. J. Hill, B. Krutzsch, B. Bandl-Konrad, E. Jobson, L. Cider, P. G. Blakeman, L. J. Peace, M. V. Twigg, M. Preis, M. Gottschling

*Corresponding author for this work

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Abstract

The sulphur tolerance and thermal stability of a 2 wt% Ag/gamma-Al2O3 catalyst was investigated for the H-2-promoted SCR of NO, with octane and toluene. The aged catalyst was characterised by XRD and EXAFS analysis. It was found that the effect of ageing was a function of the gas mix and temperature of ageing. At high temperatures (800 degrees C) the catalyst deactivated regardless of the reaction mix. EXAFS analysis showed that this was associated with the Ag particles on the surface of the catalyst becoming more ordered. At 600 and 700 degrees C, the deactivating effect of ageing was much less pronounced for the catalyst in the H-2-promoted octane-SCR reaction and ageing at 600 degrees C resulted in an enhancement in activity for the reaction in the absence of H-2. For the toluene + H-2-SCR reaction the catalyst deactivated at each ageing temperature. The effect of addition of low levels of sulphur (1 ppm SO2) to the feed was very much dependent on the reaction temperature. There was little deactivation of the catalyst at low temperatures ( 500 degrees C). The results can be explained by the activity of the catalyst for the oxidation Of SO2 to SO3 and the relative stability of silver and aluminium sulphates. The catalyst could be almost fully regenerated by a combination of heating and the presence of hydrogen in the regeneration mix. The catalyst could not be regenerated in the absence of hydrogen. (c) 2006 Published by Elsevier B.V.

Original languageEnglish
Pages (from-to)36-44
Number of pages9
JournalApplied Catalysis B: Environmental
Volume70
Issue number1-4
DOIs
Publication statusPublished - 31 Jan 2007
Event4th International Conference on Environmental Catalysis - Heidelberg, Germany
Duration: 05 Jun 200508 Jun 2005

Keywords

  • AL2O3
  • PROMOTION
  • LOW-TEMPERATURES
  • SCR-NOx
  • toluene
  • PROPANE
  • silver
  • LEAN-BURN CONDITIONS
  • octane
  • SELECTIVE REDUCTION
  • PT/AL2O3
  • ageing
  • EXAFS
  • ALUMINA CATALYSTS
  • sulphur tolerance
  • SO2
  • AG/AL2O3 CATALYSTS
  • Ag/gamma-Al2O3
  • XRD

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Environmental Chemistry

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    Breen, J. P., Burch, R., Hardacre, C., Hill, C. J., Krutzsch, B., Bandl-Konrad, B., Jobson, E., Cider, L., Blakeman, P. G., Peace, L. J., Twigg, M. V., Preis, M., & Gottschling, M. (2007). An investigation of the thermal stability and sulphur tolerance of Ag/Y-Al2O3 catalysts for the SCR of NOx with hydrocarbons and hydrogen. Applied Catalysis B: Environmental, 70(1-4), 36-44. https://doi.org/10.1016/j.apcatb.2006.05.005