Catalyst Plugging in Thruway Police Vehicles 770658
As a response to experiences of in-service plugging of police vehicles, the Automotive Emissions Laboratory has examined 20 high-mileage cars from the New York State Thruway Authority, whose total fleet numbers approximately 100 vehicles. Fourteen catalysts from twelve vehicles were found to be at least 25 percent physically plugged with thin deposits distributed on the front surface of the forward monolith. Analysis of these catalyst deposits by X-Ray Fluorescence indicated that the plugging material was composed mainly of oil additive components (zinc, calcium, barium, phosphorous) as well as iron and lead. Except for one converter with a deposit assay of 25 weight percent manganese, these deposits were in the range of 0.2 to 9.2 weight percent manganese.
Our results indicate that monolith catalysts can plug in the absence of significant levels of manganese. However, increased manganese levels in gasoline result in higher levels of manganese aerosols in exhaust streams which may combine with oil additive components to accelerate the plugging process.
Citation: Wotzak, G., Kolak, N., Gibbs, R., and Cheng, R., "Catalyst Plugging in Thruway Police Vehicles," SAE Technical Paper 770658, 1977, https://doi.org/10.4271/770658. Download Citation
Author(s):
Gregory P. Wotzak, Nicholas P. Kolak, Richard E. Gibbs, Roger J. Cheng
Affiliated:
New York State Department of Environmental Conservation
Pages: 20
Event:
1977 SAE International Fall Fuels and Lubricants Meeting and Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Rescue and emergency vehicles and equipment
Manganese
Catalysts
Calcium
Iron
Emissions
Fleets
Gasoline
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »