Question

Catalytic poisoning is due to:

• A. increasing activation energy
• B. adsorption of poisoner on the reactants surface
• C. adsorption of poisoners on the catalyst surface
• D. increase in heat of reaction

Answer 1

The correct option is C adsorption of poisoners on the catalyst surface

Catalyst poison, substance that reduces the effectiveness of a catalyst in a chemical reaction. They accumulate on the surface of solid catalysts and cause their effectiveness to decrease. For this reason, when the effectiveness of a catalyst has reached a certain low level, steps are taken to remove the poison or replenish the active catalyst component that may have reacted with the poison.