Catalytic poisons can be classified into several categories based on their origin and the nature of their interaction with the catalyst:
Sulfur Compounds: These are common poisons for many metal catalysts, especially those used in hydrogenation reactions. Halogens: Chlorine and fluorine can deactivate catalysts by forming strong bonds with active sites. Carbon Monoxide: This can act as a poison for metal catalysts, particularly those used in hydrogenation and oxidation reactions. Coke Formation: Carbonaceous deposits can block active sites in heterogeneous catalysts.
