Rhodium(III) nitrate
CAS 10139-58-9
Rhodium nitrate is the halide-free rhodium source for catalyst manufacture — the impregnation precursor for three-way automotive catalysts and supported Rh systems, supplied as assayed solution or solid.
Typical specification
| Molecular formula | Rh(NO₃)₃ (solution/solid) |
|---|---|
| Molecular weight | 288.92 |
| Purity (metals basis) | ≥ 99.9% |
| Rhodium content | ≥ 35.6% solid; solutions at specified Rh g/L |
| Chloride | ≤ 50 ppm |
| Free acid | Specified per grade |
| HS code (export) | 2843900099 |
Lot-specific COA issued with every shipment. SDS and ICP elemental impurity data available on request.
Where Rh(NO₃)₃ is used
Three-way catalyst manufacture
The standard Rh washcoat chemistry for NOx reduction in automotive catalysts — the single largest industrial use of rhodium — where halide-free dispersion is mandatory.
Supported Rh catalyst preparation
Feeds Rh/Al₂O₃ and Rh/ceria systems for hydrogenation, steam reforming and research catalysis requiring chloride-free metal loading.
Storage and shipping
Storage. Store sealed away from organics; oxidizing salt.
Shipping. Oxidizer classification applies to some grades; DG documentation supplied. High-value lots move via insured valuables logistics.
Packaging. Solution in DG-compliant carboys by contained Rh weight · Solid: 5 g – 100 g
Synonyms
- Rhodium trinitrate
- Rh nitrate solution
- Halide-free rhodium precursor
Frequently asked questions
How do you manage rhodium's price volatility on solution orders?
Each quote states its fixing reference and validity window; the metal leg locks at order confirmation, and standing solution deliveries can be fixed forward against your production schedule.
How is pricing structured?
Quotes reference the day's metal fixing on assayed contained metal plus a stated conversion charge, and can be locked at order confirmation for recurring volumes.
Do you take back spent material?
Yes — spent catalyst, residues and off-spec lots are assayed on receipt and the recovered metal credited against your next order, closing the loop on your metal inventory.