Diesel engines are preferred system over the gasoline, due to their high fuel efficiency, low-operating cost, high durability and low CO2 emission. However, emissions of NOx and soot as well as CO and HCs from diesel engines are major concern due to severe health and environment effects. Further, Euro-6/Euro-VI standards for light duty/heavy duty vehicles are implemented in Sept. 2014 require additional reduction of 56%/80% in NOx and 10%/67% in soot emissions compared to Euro-5/Euro-V levels respectively. Four way catalysts (FWC) seem to be a possible single-component technology solution to...