Which outcome occurs when solid catalyst's surface area accessible to reactants decreases during exothermic reaction?

💡 Explanation

When a solid catalyst's surface area decreases, fewer active sites are available for reactant adsorption and interaction, reducing the number of successful catalytic cycles per unit time, thereby lowering the effective reaction rate constant. Therefore, the reaction rate constant decreases, rather than increasing yield, lowering activation energy, or increasing selectivity for byproducts, which depend on different process parameters.

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