Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle

H. Sumida; Y. Koda; A. Sadai; S. Ichikawa; M. Kyogoku; M. Takato; Y. Miwa; R.W. McCabe

doi:10.4271/2004-01-0147

2004-03-08

Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle 2004-01-0147

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.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Digital $35.00 Print $35.00

Preview Document

We also recommend:

Standards

SAE Mobilus®

Publications

News

Events

Professional Development

A World in Motion (PreK-12)

Participate with SAE

SAE Membership

Donate

Analysis of Phosphorus Poisoning on Exhaust Catalysts from Compact-Class Vehicle 2004-01-0147

SAE MOBILUS