Which outcome occurs when Zeolite catalyst active sites are exposed to high sulfur concentrations during hydrocarbon cracking?

💡 Explanation

When sulfur concentration is high, adsorption of sulfur compounds poisons active sites on the zeolite catalyst, increasing energy barrier for hydrocarbon molecule adsorption and subsequent cracking reactions. Therefore greater activation energy results, rather than decreased area, chain propagation or enhanced selectivity if catalysts sites weren't inhibited.

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