... metals such as platinum, palladium and rhodium, which are used for purifying of unburned hydrocarbons (HC) , carbon monoxide (CO) , and oxides ... nitrogen (NOX) form the internal combustion engine . The cells of honeycomb density can be 100,200,300, 400 or 600 cpsi ... . Excellent adhesion between wash-coat and susbstrate with netty structure ceramic catalyst for non-road machine