Final answer:
Etcl in this reaction serves as a catalyst, facilitating the reaction process without being consumed.
Step-by-step explanation:
In this reaction, etcl plays the role of a catalyst. A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It does this by providing an alternative reaction pathway with a lower activation energy.
In the given reaction, etcl helps facilitate the adsorption of the reactant(s) onto its surface, activates the adsorbed reactant(s), and promotes the reaction of the adsorbed reactant(s) to form product(s). Finally, the product(s) desorbs from the surface of the catalyst.