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Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle
Technical Paper
2004-01-0147
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Phosphorous poisoning on customer-aged catalysts was investigated by material analysis and performance testing. Most of the phosphorus was associated with the oxide components in the washcoat. These contaminants were roughly classified as aluminum phosphate, cerium phosphate, zinc-calcium phosphate. Deactivation of the catalyst with aluminum phosphate was strong and followed a linear correlation from oxalic acid testing. Phosphorus scavenging additives were researched to inhibit increase of aluminum phosphate. According to thermodynamic calculations, lower free energy of compounds of additive and phosphate is expected to prevent formation of aluminum phosphate.
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Citation
Sumida, H., Koda, Y., Sadai, A., Ichikawa, S. et al., "Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle," SAE Technical Paper 2004-01-0147, 2004, https://doi.org/10.4271/2004-01-0147.Also In
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