Platinum catalysts are highly valued noble metal catalysts known for their exceptional efficiency, selectivity, and stability across a wide range of chemical reactions. Primarily utilized in automotive catalytic converters, they play a critical role in reducing harmful emissions by converting carbon monoxide, nitrogen oxides, and unburned hydrocarbons into less toxic compounds such as carbon dioxide, nitrogen, and water vapor. Their unique ability to facilitate redox and hydrogenation reactions at lower activation energies makes them indispensable in petroleum refining, pharmaceuticals, and chemical industries. Platinum catalysts are often supported on materials like alumina or activated carbon to increase surface area and enhance catalytic performance. While they demonstrate excellent durability and remain effective under extreme temperature and pressure, they are extremely costly due to platinum’s rarity and are vulnerable to deactivation when exposed to impurities such as sulfur or lead. Innovations like nano-platinum catalysts have significantly improved efficiency, enabling reduced platinum usage while maintaining high catalytic activity. Despite their limitations, platinum catalysts continue to dominate industries where emission control, fuel cell development, and precision chemical synthesis are critical. Their vital role in cleaner technologies ensures strong global demand, cementing their status as one of the most important industrial catalysts.