Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 277, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119176
Keywords
Methane; Catalyst; Oxidation; Rhodium; Sulfur tolerance
Funding
- Innovation Fund Denmark (IFD) [155-2014-10]
- Danish Maritime Fund
- Technical University of Denmark (DTU)
- Haldor Topsoe
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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 degrees C essentially full coverage of S-species was reached with 1 - 2 ppm of SO2, but at 500 degrees 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.
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