"A catalyst is a substance which changes the speed of a reaction, without being changed or used up in the reaction."
The activation energy is the lowest amount of energy needed for a reaction to occur.
Catalysts lower the activation. This makes it easier for the reaction to occur, and means a lower temperature can be used.
Catalysts work better with a larger surface area. Catalysts usually come in a powder, pellet or gauze.
Catalysts reduce costs in industry because: they speed up reactions, increasing the amount of product made in a length of time; they lower the temperature, and the amount of fossil fuels burnt; they are not used up, so last for a long time.
Catalysts can be expensive, and often need to be cleaned. You normally need a different catalyst for each reaction, increasing the cost.
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