"Geoff" wrote in message
gy.com...

"no one" wrote in message
...
Not a conventional three-way catalyst. Once it goes rich and all the
stored
oxygen is gone it loads up with carbon really fast and it cools off. In
fact, excess fuel is used to for catalyst protection when it gets too hot.
I didn't read the posted link but hopefully it included little story on
the
oxygen-bucket theory. Sometime in the near future (post-Super Bowl) I'll
find the catalyst efficiency vs. lambda charts online and post a link -
TWC
efficiency diverges quickly from stoichiometry.


I found what I was looking for if anyone is still interested -
http://www.autoshop101.com/forms/h64.pdf, the top of page 4 shows the plots
of HC, CO, and NOx efficiencies versus air-fuel ratio.