Different metal poisons have varying effects on catalysts:
Lead (Pb): Strongly binds to catalytic sites, particularly in hydrogenation and dehydrogenation reactions, causing significant deactivation. Mercury (Hg): Poisoning is severe in processes involving noble metals like palladium (Pd) and platinum (Pt). Arsenic (As): Commonly poisons catalysts in hydroprocessing by forming stable complexes with active metals. Sulfur (S): Known for poisoning metal catalysts, especially those used in hydrodesulfurization.
