[ferretman25]

If you add a catalyst to a reaction, it will increase the rate of reaction. But of course, this will continue to a certain extent, as the relative impact of the catalyst on the reaction's duration decreases. Can someone explain why this occurs and whether it is possible to calculate when the effect of a catalyst will max out in terms of decreasing the reaction rate (as in when it will no longer have a noticeable effect)?

[Corribus]

Catalysts work in a lot of different ways, so it's not easy to generalize. It depends a lot on whether catalysts get consumed over time due to deleterious secondary processes, what their turnover numbers are, and what mechanism they use to catalyze the reaction.