49-State

PURPOSE
The Reduction Oxidation (REDOX) catalytic converter is especially formulated to withstand the rigorous requirements of medium to heavy duty trucks. It simultaneously controls HC, CO and NOx depending on the exhaust gas mixture stoichiometry..

OPERATION
As the exhaust gases come into contact with the catalyst, a three-way conversion takes place. The TWC catalyzes the oxidation reaction of unburned hydrocarbons, carbon monoxide, NOx and also, the reduction reaction of oxides of nitrogen. The TWC reduces the concentration of these emissions to acceptable levels. The three way conversion only occurs with the air fuel ratio near stoichiometry (14.7 to 1).

CONSTRUCTION
Contains a catalyst in the form of a specially treated honeycomb structure saturated with "catalytically" active precious metals, either platinum and rhodium or palladium and rhodium.