At 04:53 PM 5/16/2012, Dennis Haynes wrote:
>This is going to be hard for me to explain but I will try my best.

Good explanation and good article.  For those wondering how the
system can work when one reaction needs too rich and the other too
lean, there are separate catalyst beds that each keep working
independently through the time when the mixture is unfavorable for
them, then are recharged when the mixture is favorable.

Yours,
David