Platinum is used in autocatalysts, the devices that convert the harmful components of exhaust gas into less harmful ones. It has historically dominated diesel applications while palladium dominated petrol, and because the two metals are chemically interchangeable in many formulations, manufacturers substitute between them. Automotive use was 3,031 thousand ounces of platinum in 2025 on World Platinum Investment Council figures, against total demand of 8,431 thousand ounces.
A catalytic converter contains a ceramic honeycomb coated with a very thin layer of precious metal. Exhaust gas passes through it, and the metal speeds up reactions that turn carbon monoxide, unburnt hydrocarbons and oxides of nitrogen into carbon dioxide, water and nitrogen. The metal itself is not consumed. It sits there, doing the same job, for the life of the vehicle.
That last property matters more than it sounds, and it shapes the whole market for the metal.
Two metals for one job
Platinum and palladium catalyse many of the same reactions. They are not perfectly interchangeable, because exhaust chemistry and operating temperature differ between engine types and the metals suit those conditions differently, but across a wide range of formulations a manufacturer has a genuine choice.
The conventional division is that platinum has dominated diesel applications and palladium petrol ones. That division is why the fate of the diesel engine matters to platinum specifically. Johnson Matthey records that the global light diesel segment, dominated by Europe and India, lost further share in 2025, with world production falling a further 5 per cent. Light-duty petrol production, meanwhile, rose slightly to 68.7 million units, matching the post-pandemic peak of 2023.
Where the two metals do overlap, sustained differences in availability push manufacturers to reformulate. Johnson Matthey reports ongoing substitution alongside thrifting, the practice of reducing the total metal loading on each vehicle. Johnson Matthey records that global average loadings on light petrol vehicles declined marginally in 2025, reflecting further thrifting.
Reformulation is not quick. A catalyst formulation has to be validated against an emissions standard for a specific engine family, so the decision is made years before the vehicles carrying it reach a road, and it does not reverse in a hurry.
Emissions rules set the floor
Autocatalyst demand exists because regulation requires it, so the regulations are worth watching more closely than the vehicles.
Euro 7 applies to new models from late November 2026. For light vehicles Johnson Matthey characterises it as only a limited tightening relative to Euro 6e, producing what it calls a small increase in the average metal content of European petrol vehicles. In North America, the Federal Tier 3 phase-in completed during 2025 and the Tier 4 phase-in begins with model-year 2027 vehicles.
The pattern is incremental rather than dramatic. Each tightening lifts loadings modestly; each generation of catalyst technology finds ways to do more with less.
Where platinum comes from
Supply is concentrated to an unusual degree. On World Platinum Investment Council figures, refined production in 2025 was 5,557 thousand ounces, of which South Africa supplied 3,957 thousand. That is a little over 71 per cent from one country, a calculation from those two figures rather than a published share. Russia supplied 677 thousand ounces, Zimbabwe 516 thousand, North America 212 thousand and everywhere else 196 thousand between them. The country lines and the world total differ by a single thousand ounces, which is rounding in the Council's own table rather than a missing producer.
On Johnson Matthey's figures South African refined output fell just under 5 per cent in 2025. Johnson Matthey puts underlying mine production at about 3.86 million ounces, down 3 per cent, after extreme first-quarter rainfall closed parts of one large mine. New supply is scarce: Ivanplats' Platreef is the first greenfield project commissioned since 2019, with a first-phase target of roughly 100,000 ounces of platinum-group metals annually.
Recycling supplied a further 1,679 thousand ounces in 2025, about 23 per cent of total supply, and autocatalyst scrap was roughly three-quarters of that. This is where the fact that the metal is not consumed pays off: platinum installed in a vehicle two decades ago is recoverable when that vehicle is dismantled.
Demand is not only cars
Automotive use was 3,031 thousand ounces in 2025 against total demand of 8,431 thousand, so the largest single category is well short of a majority. Jewellery took 2,214 thousand ounces, industrial applications 2,049 thousand and investment 1,136 thousand, the four lines differing from the total by one thousand ounces on the same rounding.
The industrial group is genuinely varied: chemical catalysts at 578 thousand ounces, glass manufacturing including display screens at 206 thousand, medical applications at 320 thousand, petroleum refining at 182 thousand, electrical at 99 thousand, and stationary hydrogen and other uses at 65 thousand, with the balance of about 600 thousand ounces grouped as other industrial. The named lines and that residual again differ by one thousand ounces on rounding. Medical uses include platinum-based cancer treatment compounds and pacemaker components.
Hydrogen is the category the World Platinum Investment Council singles out, from a small base. Platinum is used in proton-exchange-membrane electrolysers that split water to make hydrogen. The World Platinum Investment Council notes China's fifteenth five-year plan doubling its fuel-cell electric vehicle target to 100,000 units by 2030, and a 10 megawatt alkaline electrolyser project in South Korea. Neither is large against a market measured in millions of ounces; both indicate a direction.
Two respected sources disagree, and that is normal
Anyone comparing market reports will find the numbers do not match. For 2025 the World Platinum Investment Council puts total platinum demand at 8,431 thousand ounces while Johnson Matthey puts it at 8,019 thousand. The difference is methodological rather than a dispute about facts. Note also that the two South African figures quoted above are not competing estimates of the same thing: the Council's 3,957 thousand ounces is refined production, while Johnson Matthey's 3.86 million ounces is underlying mine production, which is a different measure. Where they genuinely diverge is on investment flows, stock movements and the definition of secondary supply, which Johnson Matthey confines to open-loop recycling, excluding warranty and production scrap. Reading either consistently is more useful than switching between them for whichever figure suits an argument.
Where to look next
- Platinum in Australian dollars - the reference price page for the metal.
- Palladium in Australian dollars - the metal on the other side of the substitution trade.
- Gold in Australian dollars - a precious metal with almost no industrial demand, for contrast.
Sources
- World Platinum Investment Council, Platinum Quarterly Q1 2026 (18 May 2026) - refined production by country for 2025, recycling by source, the demand split across automotive, jewellery, industrial and investment with the industrial sub-categories, above-ground stocks, China's fuel-cell vehicle target and the South Korean electrolyser project
- Johnson Matthey, PGM Market Report May 2026 - the independent supply and demand estimates, the fall in world light diesel production and the light petrol production figure, the report of ongoing substitution, thrifting and model-mix effects and the marginal decline in average loadings, the Euro 7 timing and its characterisation for light vehicles, the Tier 3 and Tier 4 phase-in dates, South African production and the weather-related disruption, the Platreef commissioning, and the definition of secondary supply as open-loop recycling
- World Platinum Investment Council, Demand Drivers - the sector shares of total platinum demand across recent years and the named non-automotive applications including electrolysers, nitric acid production, glass, medical uses and petrochemical catalysts
- Johnson Matthey, PGM Market Report May 2025 - the earlier-year supply and demand series used to place the 2025 figures in a three-year context
Not financial advice, and not a recommendation of any product or institution. Reviewed by the Tradergy editorial team, September 2026.
Common questions
What does platinum do in a catalytic converter?
It acts as a catalyst, speeding up the reactions that convert the harmful components of exhaust gas into less harmful ones without being consumed itself. Because the metal is not used up, it can be recovered when the vehicle reaches the end of its life, which is why autocatalyst scrap is the largest single source of recycled platinum.
Why do diesel and petrol engines use different metals?
The two exhaust streams have different chemistry and different operating temperatures, and the metals suit them differently. Platinum has historically dominated diesel applications and palladium petrol ones. The distinction matters commercially because the global light diesel segment, concentrated in Europe and India, has been losing share, with world production falling a further 5 per cent in 2025.
Can platinum replace palladium?
In many formulations yes, which is why manufacturers move between them. Both metals catalyse the same reactions in petrol applications, so a sustained gap in availability or cost between the two creates an incentive to reformulate. Johnson Matthey reports ongoing substitution, thrifting and model-mix effects in its market report.
Where does platinum come from?
Overwhelmingly from South Africa. On World Platinum Investment Council figures, South Africa produced 3,957 thousand ounces of refined platinum in 2025 out of a world total of 5,557 thousand ounces, or a little over 71 per cent. Russia supplied 677 thousand ounces, Zimbabwe 516 thousand and North America 212 thousand.
What else is platinum used for?
Jewellery is the second-largest category, at 2,214 thousand ounces in 2025, followed by a broad industrial group covering chemical and petroleum catalysts, glass manufacturing including display screens, medical uses such as cancer treatment compounds and pacemakers, and electrical applications. Hydrogen-related uses, including electrolysers, are small today but are the sector the World Platinum Investment Council singles out for growth.