Sulfur poisoning and regeneration of Rh-ZSM-5 catalysts for total oxidation of methane

Yu Zhang, Peter Glarborg, Martin Peter Andersson, Keld Johansen, Thomas Klint Torp, Anker Degn Jensen, Jakob Munkholt Christensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The activity of Rh/ZSM-5 catalysts for methane oxidation was investigated under conditions simulating the exhaust from lean burning, natural gas fueled engines to evaluate the influence of reaction atmosphere on catalytic activity. The Rh-catalysts yield high methane conversion at conditions achievable in real exhaust systems, despite the inhibiting effects of H2O and SO2. The influence of temperature and SO2 concentration (1−20 ppm) on the activity were studied. The deactivation caused by SO2 was intensified with decreasing temperature and increasing SO2 concentration, and the SO2-poisoning could be modeled as the occupation of active sites following a Temkin adsorption isotherm. At 400 °C essentially full coverage of S-species was reached with 1−2 ppm of SO2, but at 500 °C the coverage had decreased significantly, and considerable catalytic activity was preserved in the presence of SO2. Significant activity was regenerated in SO2-free gas, but the nature of the SO2-free regeneration atmosphere was unimportant.
Original languageEnglish
Article number119176
JournalApplied Catalysis B: Environmental
Volume277
Number of pages8
ISSN0926-3373
DOIs
Publication statusPublished - 2020

Keywords

  • Methane
  • Catalyst
  • Oxidation
  • Rhodium
  • Sulfur tolerance

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