Platinum: The Rarer-Than-Gold Metal That Cleans Your Car's Exhaust
Platinum is a dense, corrosion-resistant precious metal ~30× rarer than gold, with its primary industrial use in catalytic converters and significance in fuel cells and jewelry.
Platinum (Pt, atomic number 78) is a dense, malleable, corrosion-resistant precious metal in the platinum group metals (PGMs: platinum, palladium, rhodium, ruthenium, iridium, osmium). It is approximately 30× rarer than gold in Earth's crust, with roughly 80% of world supply coming from South Africa's Bushveld Complex. The primary industrial application is in catalytic converters, where platinum catalyzes the oxidation of carbon monoxide and hydrocarbons in vehicle exhaust. It is also essential in fuel cell electrodes (particularly PEM fuel cells for hydrogen vehicles), petroleum refining catalysts, pharmaceutical synthesis, and high-end jewelry. Platinum's price has historically fluctuated relative to gold. Before 2015, platinum usually traded above gold; since then, gold has generally commanded a premium. Price is closely tied to automotive demand — the shift toward electric vehicles (which don't require catalytic converters) creates long-term demand uncertainty, partially offset by growing fuel cell and hydrogen economy applications. Aqua Regia: The Only Acid That Dissolves Gold is one of the few chemical mixtures capable of dissolving platinum, alongside gold.