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Now let's try to calculate a safety limit to insure
a good conservation of the catalyst within the time.
If we consider that only 1/100 of collisions are
efficient and that 1 molecule can really poison 1/100 of the 100
Å2 catalyst surface
For a safety limit of six months we obtain a number
of 109 molecules
meaning a 10-5 ppb concentration,
actually rather difficult to evaluate experimentaly.