This paper describes aldehyde and unburned fuel emissions (UBF) measurements made on several light-duty, methanol-fueled vehicles with developmental 2.5-L engines and production and three-way catalytic converters. Emissions data were obtained under both steady-state and Federal Test Procedure (FTP) driving-cycle conditions. The data were then compared to those from a similarly equipped production gasoline vehicle.Before- and after-catalyst aldehyde and UBF emissions data are presented for three vehicle types as a function of equivalence ratio. In addition, aldehyde emission data for one of the methanol vehicles using a base-metal catalyst are discussed.The steady-state tests showed that both before- and after-catalyst aldehyde and UBF emissions are minimized by vehicle operation at lean equivalence ratios. The data also showed that formaldehyde accounted for 98% of the total aldehydes from the methanol vehicles, and only 31-54% of the total aldehydes from the gasoline vehicle. In addition, the steady-state tests showed that a base-metal catalyst was as effective as the three-way catalyst in controlling aldehyde exhaust emissions from the methanol vehicles.Under the Federal Test Procedure conditions, the methanol-fueled vehicles had aldehyde emissions ten times higher than, and unburned fuel emissions equal to those of the gasoline-fueled vehicle.
Aldehyde and Unburned Fuel Emissions From Developmental Methanol-Fueled 2.5L Vehicles
Sae Technical Papers
1987 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1987
1987-11-01
Aufsatz (Konferenz)
Englisch
Aldehyde and Unburned Fuel Emissions from Methanol-Fueled Heavy-Duty Diesel Engines
SAE Technical Papers | 1986
|Aldehyde and unburned fuel emissions from methanol-fueled heavy-duty diesel engines
Kraftfahrwesen | 1986
|SAE Technical Papers | 1985
|