What Materials are Used in Auto Exhaust Catalysts?
The efficiency and durability of auto exhaust catalysts depend on the materials used. Common materials include:
- Platinum (Pt): Effective for both oxidation and reduction reactions. - Palladium (Pd): Primarily used for oxidation of hydrocarbons and CO. - Rhodium (Rh): Especially effective for NOx reduction.
These precious metals are dispersed on a ceramic or metallic substrate, which provides a large surface area to maximize the contact between the exhaust gases and the catalyst.
