Diesel Three Way Catalyst (DTWC) works in a similar way like autocatalyst. However, because generator-drive diesel engines emit more nitrogen oxides and particulate matters than petrol cars normally do DTWCs must have higher performance standard to achieve diesel engine emission purification. Trunett C2 series DTWCs reduce nitrogen oxides to nitrogen and oxygen and simultaneously oxidize carbon monoxide, gaseous and liquid hydrocarbons, including those adsorbed on the carbon particles, to carbon dioxide and water. The liquid hydrocarbons are known as the soluble organic fraction (SOF) and make up part of the total particulate matter. In comparison to Diesel Particulate Filter the carbon fraction of the particulate matter remains mostly unaffected in this process due to insufficient reaction time.

Chemical Reactions HC+O2--H2O+CO2 (UP TO 95%) CO+O2 --CO2 (UP TO 95%) NOx --N2+O2 (UP TO 30%) PM+O2 --CO2 (UP TO 30%) SOx --S+O2 (N.A.) Max. Emission Reduction Performance on Petrol Vehicles & Diesel Engines