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Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 08, 2004 by SAE International in United States
Annotation ability available
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.
CitationSumida, 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.
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