INITIAL PERFORMANCE OF SLIPPORTED NITROGEN OXIDE REDUCTION CATALYSTS IN A DUAL-CATALYST SYSTEM

The initial nitrogen oxide reduction acitivity of several alumina-supported, platinum-group metal catalysts is evaluated in vehicle tests. The nitrogen oxide catalysts included Ru, Ru-Pt, Ru-Pd, mechanical mixtures of Ru and Pt, Pt-Ni, Pt, and Rd. As evaluated over the 1975 FTP, the nitrogen oxide reducing effectiveness of these catalysts was: Ru combinations greater than Pt-Ni greater than Pt approximately equal to Pd. Modulated air injection was used, enabling the nitrogen oxide converters to be used as oxidizing converters during vehicle start-up. The nitrogen oxide reduction performance of all the nitrogen oxide catalysis was enhanced by bleeding a small amount of air into the nitrogen oxide converters.

• Corporate Authors:

  Society of Automotive Engineers

  485 Lexington Avenue
  New York, NY  United States  10017
• Authors:
  • Barnes, G J
• Publication Date: 1974-2

Media Info

• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Air; Carbon monoxide; Catalysts; Flow; Hydrocarbons; Nitric oxide; Nitrogen oxides; Platinum; Pollutants; Reduction (Chemistry)
• Uncontrolled Terms: Air flow
• Old TRIS Terms: Emission rates
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00083627
• Record Type: Publication
• Report/Paper Numbers: SAE Paper No. 740251
• Files: TRIS
• Created Date: Apr 8 1975 12:00AM