Rhodium

What it is

Rhodium (symbol Rh, atomic number 45) is the rarest of the six platinum-group metals (PGMs), typically occurring in concentrations below one part per million in ore. It is extracted exclusively as a byproduct of platinum and nickel mining, never from primary deposits. Its most commercially critical property is catalytic reduction of nitric oxides (NOx) in automotive three-way catalytic converters, a use that accounts for roughly 80-85% of annual demand. Secondary applications include catalysis in nitric acid and acetic acid synthesis (approximately 8% of demand), glass manufacturing for fibreglass and flat-panel LCD substrates (approximately 4%), and small volumes in electronics and medical instruments. Global mine supply runs at approximately 34-35 tonnes, or just over one million troy ounces, per year. South Africa's Bushveld Complex accounts for more than 80% of that total; the dominant producers are Anglo American Platinum (Amplats), Impala Platinum (Implats), and Sibanye-Stillwater. Russia's Nornickel contributes roughly 10-12%, with Zimbabwe and Canada accounting for the balance.

History

Rhodium was identified in 1803 by British chemist William Hyde Wollaston, who named it from the Greek "rhodon" (rose), after the rose-red colour of its chloride salts. Commercial demand remained marginal until the US Clean Air Act of 1970 mandated catalytic converters on new automobiles. Tightening emission standards in Europe and Japan through the 1980s and 1990s created the structural autocatalyst demand base that persists today. Prices reached an all-time high of approximately US$30,000 per troy ounce in March 2021, driven by post-pandemic supply disruptions in the Bushveld Complex and simultaneous tightening of Euro 6d and China 6b emission standards. The price then declined sharply through 2022-2024 as South African producers restored output, palladium-to-rhodium substitution in some converter formulations increased, and accelerating EV adoption began eroding the combustion-engine market. The 2024 annual average rhodium price fell 31% from 2023, according to USGS data.

Current state

As of early 2026, rhodium trades near US$5,600-6,000 per troy ounce, a partial recovery from 2024 lows of US$4,400-4,800. Johnson Matthey's May 2025 PGM market report projects the rhodium market will remain in deficit through 2025, with declining South African supply and falling automotive demand, partially offset by a rebound in glass-industry purchasing after five years of inventory destocking from 2020 to 2024. The 2024 market recorded a supply/demand deficit of approximately 65,000 troy ounces, with supply near 999,000 ounces against demand near 1.06 million ounces. Sibanye-Stillwater cut planned PGM output by at least 35% in 2025 under sustained low prices, tightening South African supply. Anglo American Platinum is completing a demerger from Anglo American, separating its South African mining assets into an independent listed company, which could affect capital allocation and mine investment timelines.

Relationships

Rhodium, palladium, and platinum trade as a linked basket: automotive engineers reformulate converter blends as PGM price ratios shift, creating cross-substitution pressure tracked in Palladium and Platinum. Nornickel's supply trajectory, constrained by Western sanctions and declining Arctic ore grades, is tracked in الاتحاد الأوروبي يحظر التعاملات عبر ميناء مورمانسك لكن النيكل الروسي ما زال يصل إلى الأسواق الغربية؛ إنتاج نورنيكل يهبط بحدة في الربع الأول وتُسرّع محادثات مشروع نحاس مشترك مع الصين and Nornickel; Russia's pivot to Chinese metals buyers reshapes downstream trade flows for all three PGMs, with rhodium following palladium into discounted Chinese spot markets. Broader 2026 PGM market dynamics are covered in البلاتين يسجل رقماً قياسياً عند 2,913 دولاراً للأوقية في يناير 2026 مع دفع انقطاعات الكهرباء في جنوب أفريقيا وتوقعات الطلب على الهيدروجين متوسط 2026 إلى نحو 1,550 دولاراً للأوقية؛ والبلاديوم يستقر عند 1,262 دولاراً للأوقية.

What to watch

EV penetration rates in China, the US, and the EU, which are the decisive variable for autocatalyst demand over the next five years. Anglo American Platinum's output trajectory and capital spending after its demerger from Anglo American. South Africa's Eskom power constraints, which have repeatedly disrupted Bushveld Complex throughput since 2019. Euro 7 emission standards in the EU, applying to gasoline vehicles from 2025, which preserve autocatalyst requirements for new internal combustion and hybrid models. Hydrogen fuel cell vehicle commercialisation in South Korea, Japan, and China, which uses PGM catalysts and could partially offset combustion-engine demand erosion over the longer term.