Rhodium(III) nitrate dihydrate
CAS 13465-43-5
Rhodium nitrate dihydrate is the defined-hydrate, halide-free rhodium source for catalyst manufacture — the crystalline form preferred where formulation weight accuracy matters over bulk solution handling.
Typical specification
| Molecular formula | Rh(NO₃)₃ · 2H₂O |
|---|---|
| Molecular weight | 324.95 |
| Purity (metals basis) | ≥ 99.9% |
| Rhodium content | ≥ 31.5% (certified per lot) |
| Appearance | Dark red-brown crystals |
| Chloride | ≤ 50 ppm |
| Water solubility | Freely soluble |
| HS code (export) | 2843900099 |
Lot-specific COA issued with every shipment. SDS and ICP elemental impurity data available on request.
Where Rh(NO₃)₃·2H₂O is used
Three-way catalyst manufacture
The Rh washcoat impregnation chemistry behind NOx reduction in automotive catalysts — rhodium's largest industrial use — where halide-free dispersion is mandatory.
Supported catalyst preparation
Feeds Rh/Al₂O₃, Rh/ceria and bimetallic systems for hydrogenation, reforming and research catalysis requiring chloride-free metal loading.
Precise small-scale formulation
The defined dihydrate weighs accurately for laboratory and pilot catalyst preparation, where solution grades would introduce concentration-assay steps.
Storage and shipping
Storage. Store sealed away from organics and reducing agents; oxidizing, hygroscopic salt.
Shipping. Oxidizer classification applies; UN-approved packaging with DG documentation. High-value lots move via insured valuables logistics.
Packaging. 1 g · 5 g · 25 g · 100 g · Solution grades by contained Rh weight
Synonyms
- Rhodium trinitrate dihydrate
- Rh(NO3)3 2H2O
- Rhodium nitrate crystals
- Halide-free rhodium precursor
Frequently asked questions
Crystals or solution?
Continuous impregnation lines take solution at a certified Rh g/L to skip dissolution and assay; the crystalline dihydrate suits laboratory and pilot work where accurate small charges matter.
How is pricing structured?
Rhodium is the most volatile-priced PGM. Every quote states its fixing reference and validity window; we recommend locking the metal leg the day you confirm the order rather than the day you pay.
What documentation is included?
Every lot ships with a certificate of analysis stating assayed metal content, plus an English SDS. ICP trace-metal panels are available on request.
Do you take back spent material?
Yes — residues, spent catalyst and off-spec lots are assayed on receipt and the recovered rhodium credited against your next order.