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About This Item
Empirical Formula (Hill Notation):
Rh
CAS Number:
Molecular Weight:
102.91
EC Number:
MDL number:
UNSPSC Code:
12141738
PubChem Substance ID:
NACRES:
NA.23
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Quality Level
Assay
99.95% trace metals basis
form
powder
resistivity
4.33 μΩ-cm, 20°C
bp
3727 °C (lit.)
mp
1966 °C (lit.)
density
12.41 g/cm3 (lit.)
SMILES string
[Rh]
InChI
1S/Rh
InChI key
MHOVAHRLVXNVSD-UHFFFAOYSA-N
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General description
Rhodium is one of the rarest metals from the platinum group, found in very small quantities in the earth′s crust (0.2 parts per billion). Rhodium’s chemical properties are related to its unusual ground state valence electron configuration in which it has only one electron in its outermost s orbital. This electron configuration has important implications for its catalytic ability, which has made rhodium useful in catalytic converters for automobiles. At the same time, metallic rhodium is a noble metal, meaning it has outstanding resistance to oxidation.
The powder form of rhodium is a silvery-grey and is used not just in the auto industry, but also in other areas like chemical synthesis and powder metallurgy. Rhodium is harder and melts at higher temperatures than both platinum and palladium, which makes it’s a useful hardening element in alloys. Additionally, it is popular for coating jewelry and other items because it gives a shiny, protective layer that does not easily wear away.
The powder form of rhodium is a silvery-grey and is used not just in the auto industry, but also in other areas like chemical synthesis and powder metallurgy. Rhodium is harder and melts at higher temperatures than both platinum and palladium, which makes it’s a useful hardening element in alloys. Additionally, it is popular for coating jewelry and other items because it gives a shiny, protective layer that does not easily wear away.
Application
Rhodium can be used in the following applications:
- Rh supported on activated carbon (Rh/C) can be used as an efficient oxygen reduction reaction catalyst for the fabrication of microbial fuel cells.
- Used as a catalyst in the hydrosilylation of aromatic nitriles to N, N-disilylamines.
- Used to prepare Rhodium-Iridium alloy.
Storage Class Code
4.1B - Flammable solid hazardous materials
WGK
nwg
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
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