Lifetime impact of SO2-poisoning of a Cu-CHA catalyst for NH3-SCR

Peter S. Hammershøi, Ton V.W. Janssens, Anker D. Jensen

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Abstract

NOx (NO+NO2) emissions from diesel vehicles are reduced by selective catalytic reduction with NH3 (NH3-SCR) over V2O5- or metal-zeolite-based catalysts. Cu-CHA zeolites are particularly relevant due to their superior low-temperature activity [1]. However, the inevitable presence of SO2 in diesel exhaust causes deactivation of Cu-CHA catalysts [1-3]. As the required lifetime of an SCR catalyst is ca. 10000 h, it is important to know how the activity of the catalyst develops with long-term SO2 exposure, and if catalyst regeneration is an option. It has been shown that the deactivation by SO2 is partially reversible [3]. In this contribution, we focus on the SO2 uptake by the Cu-CHA catalyst, and how the reversible and irreversible deactivation are related to the amount of sulfur in the catalyst.
Original languageEnglish
Publication date2018
Number of pages2
Publication statusPublished - 2018
EventThe 10th International Conference on Environmental Catalysis, The 3rd International Symposium on Catalytic Science and Technology in Sustainable Energy and Environment - Tianjin, China
Duration: 21 Sep 201826 Sep 2018
http://icec-eecat2018.ydlilab.com/dct/page/1

Conference

ConferenceThe 10th International Conference on Environmental Catalysis, The 3rd International Symposium on Catalytic Science and Technology in Sustainable Energy and Environment
Country/TerritoryChina
CityTianjin
Period21/09/201826/09/2018
Internet address

Keywords

  • NH3-SCR
  • Cu-CHA
  • SO2 poisoning
  • Deactivation
  • Regeneration

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