Development of a rapid ageing technique for modern methane combustion catalysts in the laboratory: Why does SO2 concentration play an essential role?

[Display omitted] •Rapid ageing of a MOC catalyst was studied at three different SO2 concentrations.•Results suggested that sulphur concentration affected the poisoning mechanism.•Sulphate stability depended on both SO2 concentration and the ambient temperature. In pursuance to decrease emissions of...

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Published in:Applied catalysis. B, Environmental Environmental, 2019-12, Vol.258, p.117976, Article 117976
Main Authors: Auvinen, Paavo, Kinnunen, Niko M., Hirvi, Janne T., Maunula, Teuvo, Kallinen, Kauko, Keenan, Matthew, Baert, Rik, van den Tillaart, Erik, Suvanto, Mika
Format: Article
Language:English
Subjects:
Aging
Aluminum sulfate
Catalysts
Combustion
Deactivation
Durability
Information processing
Laboratories
Methane
Natural gas
Palladium sulphate
Poisoning
Stability
Sulfates
Sulfur
Sulfur dioxide
Sulphur
Temperature
Transportation
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Summary:[Display omitted] •Rapid ageing of a MOC catalyst was studied at three different SO2 concentrations.•Results suggested that sulphur concentration affected the poisoning mechanism.•Sulphate stability depended on both SO2 concentration and the ambient temperature. In pursuance to decrease emissions of transportation sector, the durability and longevity of modern catalysts has become a topical issue. Understanding the deactivation of catalysts is especially urgent. Our aim in this study was to clarify the roles of reaction temperature and SO2 concentration in methane combustion catalyst poisoning. Information about this process can help the research community perform more realistic laboratory simulations and provide new insights for catalyst development. With the collected experimental data, the likelihood that poisoning would be influenced by different sulphur species and mechanisms was evaluated. Our results suggested that both reaction temperature and SO2 concentration influenced the stability of the resulting sulphates. Low SO2 concentrations lead to formation of stabler sulphates and lower total amount of sulphur in the catalyst. In turn, high SO2 concentrations formed less stable sulphates but accumulated more sulphur. Lesser stability was attributed to formation of Al2(SO4)3 through spillover.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.117976