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If it is serving as a reactant in the first step and then being produced in the second step then it is a catalyst. On the other hand, an intermediate must first be formed by one of the steps and then used up in later steps.
A catalyst will appear in both the reactants and products since it is not consumed during a reaction. On the other hand, an intermediate does not appear in the reactants or products because the intermediate is produced and consumed during the course of a reaction.
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