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Chemical Ideas: 10.5


Catalyst: A substance which speeds up a reaction but can also be recovered chemically unchanged at
the end.

Catalysis: Process of speeding up a chemical reaction by using a catalyst.

Catalysts do not undergo any permanent chemical change, but they may change physically. For
example, the…

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Chemical Ideas: 10.5

Catalyst Poisoning

Catalysts can be poisoned so that they can no longer function properly. In heterogeneous catalysis
the `poison' molecules are adsorbed more strongly to the catalyst than the reactant molecules. The
catalyst cannot catalyse a reaction of the poison and so becomes inactive with poison molecules…


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