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| Platinum (Pt) | |
|---|---|
| Name | Platinum |
| Atomic number | 78 |
| Appearance | silvery white metal |
| Category | Transition metal |
| Phase | Solid |
| Discovered | 18th century |
| Density | 21.45 g/cm³ |
| Melting point | 2041 K |
| Boiling point | 4098 K |
Platinum (Pt) Platinum is a dense, malleable, ductile, silvery-white transition metal with exceptional corrosion resistance, high melting point, and notable catalytic activity. It is widely used in chemistry laboratories, automotive catalysis, jewelry, and various industrial applications, and it features prominently in the histories of mining, metallurgy, and monetary systems.
Platinum is a member of the platinum group metals that includes palladium, rhodium, ruthenium, iridium, and osmium, and it occupies position 78 in the periodic table. As a noble metal, it resists oxidation and corrosion under most conditions, making it indispensable in chemical industry, automotive industry, and luxury jewelry sectors. Its scarcity and geopolitical concentration of supply link it to global trade issues involving nations such as South Africa, Russia, and Canada.
Platinum exhibits a face-centered cubic crystal structure and a high density similar to that of gold and tungsten. Its electronic configuration leads to useful catalytic properties exploited in processes developed by researchers affiliated with institutions like Max Planck Society and Imperial College London. Platinum's physical properties—high melting point, thermal conductivity, and resistance to chemical attack—make it suitable for high-temperature applications in technologies derived from work at places including MIT and Toyota Research Institute. The metal forms stable alloys with iridium and rhodium, and precious-metal markets track its price alongside commodities such as palladium and gold.
Platinum occurs in native form and in mineral deposits such as sperrylite, iridosmine, and ptarmiganite-type ores, commonly associated with layered intrusions like the Bushveld Complex and the Great Dyke (Zimbabwe). Major mining operations are run by companies including Anglo American plc, Norilsk Nickel, and Impala Platinum Holdings, with significant production concentrated in South Africa, Russia, Zimbabwe, and Canada. Extraction uses techniques evolved from historical placer mining in Ecuador and Colombia and modern pyrometallurgical and hydrometallurgical methods developed at research centers like the Colorado School of Mines and CSIR (South Africa). Recycling streams from automobile catalytic converters, electronics recovered by firms such as Umicore, and jewelry refurbishing contribute to supply.
Platinum production supports diverse applications in catalysis for processes such as the industrial synthesis of nitric acid, silicones, and fertilizers; automotive catalytic converters developed by companies including Johnson Matthey and BASF; and electrodes for fuel cells commercialized by firms like Ballard Power Systems and Toyota. In medicine, platinum-based chemotherapeutic agents such as cisplatin—originally discovered following research at Michigan State University and clinical development at Johns Hopkins Hospital—are crucial in oncology. Platinum is also used in precision instruments at institutions including CERN and NASA, in laboratory equipment produced by manufacturers like Thermo Fisher Scientific, and in high-end timepieces by houses such as Rolex and Patek Philippe.
Platinum forms compounds in several oxidation states, notably +2 and +4, and participates in organometallic chemistry foundational to Nobel-winning work at Yale University and University of California, Berkeley. Complexes such as cisplatin and platinum(II) chloride display uses in medicine and catalysis; homogeneous catalysts featuring platinum centers underpin reactions studied in the laboratories of Heck, Negishi, and Suzuki laureates. Surface chemistry of platinum has been elucidated through experiments at facilities like Brookhaven National Laboratory and SLAC National Accelerator Laboratory, informing applications in heterogeneous catalysis for petroleum refining and environmental remediation.
Platinum was used by pre-Columbian cultures in Colombia and later encountered by European explorers associated with Spanish Empire expeditions in the 16th and 18th centuries. Scientific characterization advanced through work at institutions including the Royal Society and by scientists such as Antonio de Ulloa and William Hyde Wollaston, who played roles in isolating and naming the metal in the 18th and 19th centuries. The name derives from Spanish "platina", a diminutive of plata (silver), and its commercialization involved firms like Tavernier-era merchants and later industrialists in the Industrial Revolution.
Platinum mining and processing impact environments near sites such as the Bushveld Complex and regions in Siberia, raising concerns addressed by environmental agencies including the United Nations Environment Programme and national regulators like the Environmental Protection Agency. Occupational exposure in mining and refining has been studied by institutions such as NIOSH and World Health Organization, with particular attention to soluble platinum salts that can act as sensitizers and cause allergic reactions; medical monitoring protocols are informed by research at hospitals like Mayo Clinic and Karolinska Institutet. Recycling and emissions control technologies developed by firms such as Johnson Matthey and research groups at ETH Zurich aim to mitigate environmental release and human health risks.