Computational analysis for selection of Diesel Oxidation Catalyst and experimental investigation to meet BS-III/IV emission norms as low cost solution for LCV applications

Abstract

Stricter emission standards are forcing automakers to couple the catalytic converters closer to the engine exhaust. Mounting the catalytic converter (DOC) at or near the exhaust manifold helps to reduce the increase in emission after a cold engine is started. The spike occurs because cold engines require a richer air-fuel mixture to run smoothly. The emission standards can be met only by appropriate design of catalytic converter along with the thin walled substrate for faster light off of the catalyst. Further the low exhaust gas temperature experienced on light commercial diesel vehicle present a very challenging environment for the successful operation of Diesel Oxidation Catalyst (DOC). Therefore to reduce HC, CO and PM engine demands catalyst with high oxidation activity at low temperatures. Consequently with ultra thin walls and PGM coatings significant improvements in DOC efficiency is achieved at low cost, by increased geometric surface area, reduced thermal mass and Precious Group Metals (PGM) formulation. In this present study, a computational analysis is carried out to design and optimize the DOC PGM loadings and experimentally design is validated by meeting the emission norms. The engine employed for this experimental activity is a 3 cylinder, CR diesel engine.