Rhodium is found primarily in scrapped automotive catalytic converters, which account for the vast majority of recoverable rhodium in the scrap stream. It also shows up in industrial glass manufacturing equipment, laboratory thermocouples, and jewelry plating waste, though in much smaller quantities. At a forecasted price of $6,000 to $9,000 per ounce, even small amounts of rhodium make scrap recovery worthwhile.
Catalytic Converters: The Main Source
Three-way catalytic converters from gasoline-powered vehicles are by far the most common place to find rhodium in scrap. These converters use a combination of platinum, palladium, and rhodium to neutralize harmful exhaust gases. The rhodium specifically handles the conversion of nitrogen oxides into harmless nitrogen and oxygen, a job the other two metals can’t do as effectively.
The amount of rhodium inside a converter varies significantly depending on the vehicle. A small passenger car yields between 1 and 2 grams of total platinum group metals (platinum, palladium, and rhodium combined), while a large truck in the U.S. can contain 12 to 15 grams total. Rhodium is always the smallest fraction of that mix. One study of three gasoline catalytic converters at different mileage levels found rhodium concentrations ranging from 0.1 to 312 milligrams per kilogram of catalyst material. Higher-mileage converters tend to have lower concentrations because some metal is lost through normal exhaust flow over the life of the vehicle.
Not all catalytic converters contain rhodium. Diesel oxidation catalysts typically use only platinum and palladium. If you’re evaluating scrap converters, the ones worth targeting for rhodium are three-way catalysts from gasoline engines, which have been standard on gas-powered cars since the 1980s.
Glass Fiber Manufacturing Bushings
The fiberglass industry uses bushings made from platinum-rhodium alloys to shape molten glass into fine fibers. These bushings have hundreds of tiny holes through which molten glass is drawn at high speed. The rhodium in the alloy increases the metal’s strength and resistance to deformation at extreme temperatures, which is why manufacturers accept the high cost of using precious metal components.
When these bushings wear out, they become a concentrated source of rhodium scrap. Unlike catalytic converters, where rhodium is thinly dispersed across a ceramic substrate, fiberglass bushings are solid precious metal alloy. This makes them easier and more efficient to refine, though they’re far less common in the general scrap market. Most of this material circulates between manufacturers and specialized precious metals refiners rather than showing up at scrap yards.
Thermocouples and Lab Equipment
High-temperature sensors called thermocouples use platinum-rhodium wire to measure extreme heat in furnaces, kilns, and industrial processes. Three standard types contain rhodium:
- Type R: one wire is a platinum-rhodium alloy (13% rhodium), paired with a pure platinum wire
- Type S: similar design with 10% rhodium in one wire
- Type B: uses rhodium in both wires (30% in one, 6% in the other)
Scrapped thermocouple wire is a reliable, if niche, source of rhodium. The wire is thin, so individual pieces don’t contain much metal, but facilities that use dozens of thermocouples accumulate meaningful quantities over time. Specialty refiners accept this wire and recover the platinum and rhodium separately.
Jewelry and Plating Waste
Rhodium plating gives white gold and sterling silver jewelry its bright, reflective finish. The plating layer is extremely thin, typically less than a micron, which means individual pieces of jewelry hold negligible amounts of rhodium. You won’t recover anything worthwhile by stripping plating from a few rings.
The real value in jewelry-related rhodium scrap comes from the plating process itself. Electroplating baths gradually accumulate waste solutions and spent rhodium chemicals. Jewelers and plating shops that process high volumes can send these waste solutions to refiners for rhodium recovery and reuse. If you’re collecting jewelry scrap for precious metals, the gold and silver content is where the value lies, not the rhodium plating.
Why Rhodium Recovery Pays
Rhodium is one of the rarest elements on Earth, with nearly all primary production coming as a byproduct of platinum and palladium mining in South Africa. That scarcity keeps prices high. Heraeus Precious Metals forecasts rhodium at $6,000 to $9,000 per ounce through 2026, making it several times more valuable than gold on a per-ounce basis. Even so, prices have been trending downward from their 2021 peak as electric vehicle adoption reduces demand and recycling rates climb.
Modern refining techniques recover rhodium from catalytic converter scrap at impressive rates. One method using iron-based collection achieved 97% rhodium recovery under optimized conditions, with platinum and palladium both hitting 99%. This high efficiency means very little rhodium is lost in processing, which keeps scrap buying prices relatively strong.
What’s Practical for Scrap Collectors
For most people in the scrap business, catalytic converters are the only realistic source of rhodium. Glass bushings and thermocouples are valuable but circulate in specialized industrial channels. Jewelry plating waste only makes sense at commercial scale.
If you’re handling catalytic converters, the rhodium content is inseparable from the platinum and palladium inside. You can’t extract rhodium alone from a converter. Instead, you sell the whole converter (or the honeycomb substrate inside it) to a refiner who processes all three metals together. Pricing depends on the converter’s type, vehicle origin, and condition. Many buyers use handheld X-ray fluorescence analyzers to estimate metal content on the spot, giving you a more accurate price than generic lookup tables.
One emerging but currently impractical source worth knowing about: spent nuclear fuel contains rhodium as a fission byproduct. The International Atomic Energy Agency has studied the feasibility of recovering platinum group metals from high-level radioactive waste. The rhodium is there in meaningful quantities, but the radioactivity and technical challenges make commercial recovery nonviable for now.