FACTORS AFFECTING DUAL CATALYST SYSTEM PERFORMANCE
Results of warm-up and fuel economy studies on a dual catalyst system using GEM reinforced Ni-Cu nitrogen oxide reduction catalysts and PTX-II B oxidation catalysts are reported. Rapid warm-up of this system is required to control emissions to the target level of 3.4 g/mi. CO, 0.41 g/mi. HC, and 0.4 g/mi. nitrogen oxide. This rapid warm-up can be obtained only by oxidizing the CO, HC, and hydrogen in the exhaust during the first 30-60 seconds after start-up. Methods of inducing oxidation are described. Controlling nitrogen oxide to 0.4 g/mi. requires GEM catalyst temperatures of approximately 1300 deg F, which is 200 to 300 deg hotter than exhaust temperature during warmed-up operation. The additional temperature can be generated by enriching carburetion and oxidizing the CO, hydrogen, and HC formed, or by spark retard.
New York, NY United States 10017
- Lang, R J
- Leppard, W R
- Bernstein, H S
- Publication Date: 1974-2
- Pagination: 12 p.
- TRT Terms: Air quality management; Carbon monoxide; Catalysts; Fuel consumption; Hydrocarbons; Hydrogen; Nitric oxide; Nitrogen oxides; Oxidation; Temperature; Vehicle power plants
- Old TRIS Terms: Automobile engines
- Subject Areas: Energy; Highways; Safety and Human Factors; Vehicles and Equipment;
- Accession Number: 00264228
- Record Type: Publication
- Report/Paper Numbers: SAE Paper No. 740252
- Files: TRIS
- Created Date: Jan 9 1975 12:00AM