# What are some reactions which can be used to study “Effect of Catalyst on the Rate of Reaction”?

I wish to study the effect of catalyst on the rate of reaction as an investigatory project. What are some reactions and ideas that I could use to study this?

One example to this is the decomposition of $\ce{KClO_3}$ with $\ce{MnO_2}$ catalyst, The time for which $\ce{O_2}$ is evolved can be studied while varying the amount of catalyst.

What are some similar nice reactions with which notable changes in the reaction with changing amount of catalyst can be observed ?

What can be other changes I could bring in the reaction to study different aspects of the reaction and this topic effectively?