A number of recent 3-way catalyst formulations were evaluated. A comparison was made of the effects of contaminant levels on the performance of pulsator - and dynamometer-aged selected catalysts. The problems of increased ammonia formation on pulsator - and dynamometer-aged catalysts which contain base-metal oxides as oxygen-storage or water-gas shift components is attributed to S-poisoning. An inverse relationship between ammonia formation and the amount of rhodium on aged 3-way catalysts was noted. The effects of deliberate misfire on the selectively and activity characteristics are discussed. Further, the role of the water-gas shift and steam-reforming components in extending the "window" was studied. The effect of temperature and of inlet CO (H2) and hydro-carbon concentration of these reactions was investigated separately on single component samples and fully formulated catalysts. The extent of sulfate formation over typical fresh and dynamometer-aged 3-way catelysts is shown. /GMRL/

Media Info

  • Pagination: 42 p.

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Filing Info

  • Accession Number: 00158384
  • Record Type: Publication
  • Report/Paper Numbers: SAE 770196
  • Files: TRIS
  • Created Date: Nov 23 1977 12:00AM