Rh ロジウム
Does not melt in any substance when in a mass form.
It is extremely hard and is used for plating to harden surfaces.
Structure of Automotive Exhaust Gas Purification Catalysts and the Role of Rhodium
Rhodium helps reduce NOx (nitrogen oxides), which cause acid rain, contributing to eco-driving.
Three-way catalysts do not release harmful pollutants contained in automobile exhaust into the atmosphere, but instead remove them altogether. Among the precious metals used in three-way catalysts, rhodium is particularly effective for reducing NOx(nitrogen oxides), which cause acid rain, to N2(nitrogen). Platinum and palladium are used for oxidizing hydrocarbons to harmless water and carbon monoxide to carbon dioxide, thereby converting them into clean gas for emission.
Precious Metal Element Data
| Atomic Number | 45 |
|---|---|
| atomic weight | 102.9055 |
| Stable Isotope | 103Rh |
| crystal structure | fcc |
| Metallic | Trans.Metal |
| Shell structure | 2,8,18,16,1 |
| Occupied Orbit | 4d8 |
| Oxidation state | 2,3,4 |
| Atomic radius | 1.83 |
| Shared bond radius | 1.25 |
| Atomic capacitance | 8.3 |
| Density (293K) | 12.41 |
| Melting point | 1963 |
| Boiling Point | 3697 |
| Specific heat | 0.242 |
| melting heat | 21.50 |
| heat of vaporization | 493.0 |
| Thermal conductivity (273K) | 150 |
| Electrical resistivity (273K) | 4.3 |
| Linear thermal expansion coefficient (293K) | 8.2 |
| First ionization potential | 7.45890 |
| Second ionization potential | 18.08 |
| Electron Affinity | 1.137 |
| Electronegativity | 2.28 |
| Year of Discovery | 1803 |
