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Piston engines will be the dominant vehicular power plant for the next 20 years. Although modifications to engine design and operating conditions will reduce exhaust emissions substantially, catalytic exhaust-gas converters will be required to reach the extreme low levels of emission desired. Lead-free gasoline will be required to permit the catalyst to function properly for the desired mileage. The initial drop in gasoline octane number, due to omission of lead, will be recovered gradually by refinery process changes. Gasoline will become more aromatic, more isoparaffinic, and less olefinic, while being reduced in sulfur content.
The total content of polynuclear aromatics in the exhaust gas is shown to be not affected by a substantial increase in the aromatic content of the gasoline. Polynuclear aromatics in the exhaust are oxidized almost completely by catalytic converters.
Governmental actions, statements by the automotive industry, and statements by the petroleum industry are cited.
internal combustion engines, piston engines, automotive fuels, exhaust emissions, exhaust gases, catalytic converter, tetraethyl lead, gasoline, polynuclear aromatics, octane number, antiknock additives, air pollution, thermal efficiency, tests
Manager of laboratory and engineering operations, Universal Oil Products Co., Des Plaines, Ill.
Assistant to the vice president of engineering and development, Universal Oil Products Co., Des Plaines, Ill.