Some common types of catalyst poisoners include: - Sulfur Compounds: These are notorious for poisoning metal catalysts, particularly those based on platinum and nickel. - Phosphorus Compounds: Often used in industrial processes, these can deactivate catalysts by forming stable complexes. - Halides: Chlorides and fluorides can poison catalysts by forming strong bonds with the active sites. - Carbon Monoxide: Known to poison metal catalysts by forming strong bonds with the metal atoms. - Water and Oxygen: These can act as poisoners in certain catalytic reactions, particularly those involving sensitive materials like zeolites.