"Your description of the operation of a catalytic converter is correct for reducing emissions. However, speaking about GM specifically (seems appropriate for this site), the first vehicles with catalytic converters were built in 1975."

I spent 30+ years teaching auto mechanics, including catalytic converter theory and operation, and the chemistry involved in the process. Of course I'm correct. The 72 Mazda RX-2 I bought brand new had a cat- - - -for about three weeks until I broke it in half during a hill climb on Okinawa.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!