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Quote from 1997 Haynes Engine Management book:
?A weak (fuel) mixture with a high level of O2 is good for the efficient oxidation of CO and HC. On the other hand, a relatively rich mixture with some CO aids the reduction of Nox. A compromise is reached by adjusting the air-fuel ratio of the catalyst-equipment engine to the stoichiometric ratio of 14:1. This means that the engine is perhaps adjusted slightly richer than desirable??. ?A catalyst needs to reach a minimum temperature of 300?C before it begins to work efficiently, and a working temperature of 400-800?C is more desirable. As the temperature rises over 800-1000, the precious metals will begin to break down. Above 1000?C, the catalyst will melt.??. ?Excess fuel due to misfires causes overheating. Leaded petrol and excessive oil residue also destroys the catalyst.?
So. more oxygen in the exhaust dosen't lead to CAT destruction.
Bit for the critics:
This my be a bit hair-brained but if anything else it is interesting to study about...I'm learning heaps about engine managment.
At best if it works it works, at worst I've leant something and given it a go in the process.
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v6camrydriver 
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