Origin

China

The exhaust gas pass through the catalyst of honeycomb ceramics, the active ingredient of catalyst is coated with noble metals of Pt, Pd and Rh. When the exhaust is passing through the three-way catalyst, CO, HC and NOx , the activity of the gas is enhanced under high temperature. As a result, the CO would be oxidized into CO2, the HC is turned into H2O and CO2, and the NOx is deoxidized into nitrogen.

The carriers in automotive catalyst converter are ceramic. The iolite content of such carrier is usually more than 95%. The heat expansion coefficient of iolite is approximate to 0, so it can endure high temperature (its melting point: 1400°C) and heat impact up to 1200°C, The carrier is usually of honeycomb shape, and has thin walls and certain strength as required. The number of holes of a carrier shall also meet certain requirements, such as the current 400 holes per square inch or more. The cross section of carrier is circular, elliptical, or of raceway shape or other shapes, which is determined and adjusted mainly in consideration of the automobile model.