Caterpillar - Three-Way Catalyst

A flow through substrate coated with a high performance catalyst and housed within a stainless steel canister. Optional silencing available. Applicable to rich burn gas engines. A flow-through honeycomb substrate coated with a high performance catalyst and housed within a
stainless steel canister. Optional silencing available. Applicable to rich burn (stoichiometric) natural gas engines. Exhaust gas from
the engine passes over the catalyst where a chemical reaction takes place to simultaneously reduce NOx, CO, and HC emissions. A closed-loop air-fuel ratio controller is required for the TWC to work effectively