Catalysts change the rates of chemical reactions. Most catalysts are used to speed up reactions.
The catalyst is left at the end of the reaction and so it can be used over and over again.
Catalysts work by lowering the activation energy of a reaction so that more collisions result in a reaction.
Although some catalysts are expensive, they can be economical because they do not need replacing very often.
They can also reduce the energy costs and time needed for a reaction. Catalysts often work with only one type of reaction and so different reactions need different reactions need different catalysts.
Finding new and better catalysts is a major area of research for the chemical industry.
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