This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Lube Effects on Exhaust Gas Oxidation Catalyst Activity
Annotation ability available
Sector:
Language:
English
Abstract
The effects of API SE engine oils on the activity of a 1975 prototype monolithic, noble metal oxidation catalyst have been studied in long-term multicylinder laboratory engine tests. Results of this work showed that oil consumption rates, up to 1 qt/1000 miles, and lube ash up to 1.6%, do not significantly affect catalyst activity in 500 hour tests, equivalent to 20,000 miles (32,180 km).
A commercial type 1% ash SE oil showed only a small effect on catalyst activity in an extended 1250 hour test, equivalent to 50,000 miles (80,450 km). At the end of the test, the catalyst met the original 1975 emissions standards of 3.4 g/mile CO and 0.41 g/mile HC.
A higher-than-normal phosphorus-containing oil (0.32% P) caused significant loss in catalyst activity after testing for 30,000 miles (48,270 km). This suggests that any need for increased phosphorus-containing additives in future oils could cause catalyst poisoning before 50,000 miles.
This work provides added assurance for the compatibility of SE oils with oxidation catalysts on 1975 cars. However, reactor-equipped vehicles in actual service undoubtedly will provide a more severe test of the lube effects on catalyst life and durability.
Recommended Content
Authors
Citation
Bouffard, R. and Waddey, W., "Lube Effects on Exhaust Gas Oxidation Catalyst Activity," SAE Technical Paper 740135, 1974, https://doi.org/10.4271/740135.Also In
References
- Engine Oil Performance and Engine Service Classification SAE J183a
- Aykan K. Mannion W. A. Mooney J. J. Hoyer R. D. “Durability of Monolithic Auto Exhaust Oxidation Catalysts in the Absence of Poisons.” Paper 730592 SAE meeting Detroit May 1973
- Federal Register 37 216 November 1972
- Shelef M. Betta R. S. Dalla Larson J. A. Otto K. Yao H. C. “Poisoning of Noble Metal Monolithic Oxidation Catalysts in Automobile Exhaust Environment,” National AIChE Meeting New Orleans March 1973
- Weaver E. E. “Effects of Tetraethyl Lead on Catalyst Life and Efficiency in Customer Type Vehicles Operation.” Paper 690180 SAE meeting January 1969
- Gagliardi J. C. Smith C. S. Weaver E. E. “Effect of Fuel and Oil Additives on Catalytic Converters.” Paper 63-72 API, 37th Mid-year meeting New York May 1972
- Neal A. H. Wigg E. E. Holt E. L. “Fuel Effects on Oxidation Catalysts and Catalyst-Equipped Vehicles.” Paper 730593 SAE meeting Detroit May 1973
- Federal Register 38 6 January 10 1973
- McConnell R. J. McDonnell T. F. “Fuel and Lubricant Effects on Oxidizing Catalysts.” Paper 730591 SAE meeting Detroit May 1973
- Gallopoulos N. E. Summers J. C. Klimisch R. L. “Effect of Engine Oil Composition on the Activity of Exhaust Emissions Oxidation Catalysts.” Paper 730598 SAE meeting Detroit May 1973
- Rescorla A. R. “Interim Status Report Engine Oil Exhaust Emissions,” June 1973