The catalytic exhaust

The need for lead-free petrol has revived interest in an invention that was first patented on 17 April 1909 by Michel Frenkel of France; the ‘method of deodorising exhaust fumes’. The catalytic exhaust was developed by General Motors in 1974 and has become compulsory in the United States.

In October 1987, Switzerland also made the catalytic exhaust compulsory in an attempt to combat the harmful effects of pollution, in particular the destruction of her forests, which have been reduced by 40 percent.

At the end of 1988 the American company Ford produced a new platinum-free catalytic exhaust which complied with the required standards but is much less expensive, and which has been fitted on some models of their cars since 1989. The catalytic exhaust converts the polluting exhaust fumes into harmless substances by means of a series of chemical reactions. In the  final stages of these reactions, a precious metal, usually platinum, is used.

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