Second Paper: Catalytic Purification of Car Exhausts

Abstract

So far no less than 150 chemical components have been isolated in car exhaust gases and may be grouped as follows: (1) Oxides of carbon; (2) Unburned fuel; (3) Oxides of nitrogen; (4) Oxides of sulphur; (5) Lower hydrocarbons.

Smog formation is a complex photochemical reaction, and this has been reproduced in the laboratory. The catalyst device attempts to complete combustion by initiating and maintaining a medium temperature zone which, with additional air but no more fuel, will convert hydrocarbons and carbon monoxide into carbon dioxide and water. The composition of petroleum must be considered in relation to other factors. Tests with cars have shown operating problems, and results are given in the paper. Research continues on this complex problem, and development of the catalyst is well advanced.

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