... cordierite substrate, less precious metal coating, such as platinum,palladium, rhodium.emission standard euro 3,4, EPA, CARB. Leading in the ... metals such as platinum, palladium and rhodium, which are used for purifying of unburned hydrocarbons (HC) , carbon monoxide (CO) , and oxides of ... custome-tailor the catalysts according to your special requirement. ceramic catalyst for non-road machine-----VOC