Consider the following mechanism,
\[
\text{Cl} + \text{O}_3 \rightarrow \text{ClO} + \text{O}_2
\]
\[
\text{ClO} + \text{O} \rightarrow \text{Cl} + \text{O}_2
\]
In this mechanism, what is the catalyst?
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Catalysts are not consumed in a reaction and can be reused multiple times.
A catalyst is a substance that speeds up a chemical reaction without being consumed in the reaction. In this case, chlorine (Cl) appears in both the reactants and products without being consumed, indicating that it acts as a catalyst.