According to the CN III,IV and above Emission Standards for diesel vehicles(engines),WEIFU developed DOC product which can remove more than 90% of the CO,HC and SOF in the exhaust gas.By controlling the utilization of rare earth materials and micro structure of washcoat,DOC can possess well low-temperature activity with the low loading amount of precious metal.The DOC produced by WEIFU can not only be used alone but also be combined use with POC or DPF to help the regeneration process.