Journal article
Sulfur poisoning and regeneration of Rh-ZSM-5 catalysts for total oxidation of methane
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.
Language: | English |
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Year: | 2020 |
Pages: | 119176 |
ISSN: | 18733883 and 09263373 |
Types: | Journal article |
DOI: | 10.1016/j.apcatb.2020.119176 |
ORCIDs: | 0000-0002-4355-464X , Glarborg, Peter , Jensen, Anker Degn , Christensen, Jakob Munkholt and Andersson, Martin Peter |