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Euro 6 emission norms are getting implemented in India from April 2020 and it is being viewed as one of the greatest challenges ever faced by the Indian automotive industry. In order to achieve such stringent emission norms along with top performance for vehicle, a good strategy should be incorporated to control system out NOx emissions and soot regeneration. Extruded Vanadium catalyst is deployed for this passive regeneration system with DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and SCR (Selective Catalyst Reduction), where the amount of catalyst loading in DOC plays an apex role in deciding conversion efficiency of SCR and passive regeneration capabilities. This study mainly focuses on the impact of catalyst loading of DOC over SCR efficiency. NO2 to NOx ratio should be close to 0.5 for optimum conversion efficiency of SCR. Catalyst loading in DOC decides the amount of NO2 coming upstream to SCR.

The implementation of stringent BSVI norms from April 2020 has greatly revolutionized the automobile industry. With the plan for implementation of more stringent BSVI OBD-II norms from April 2023, in place, meeting legislative limits, particularly with CI engines, will be a challenge. The major challenge is the reduction in nitrogen oxides (NOx) which necessitates a selective catalytic reduction (SCR), together with effective calibration, to maintain the conversion efficiencies at the highest possible levels. The conversion efficiency is majorly dictated by temperature and exhaust mass flow. Hence, optimization of thermal management modes are very important. This is achieved by a close-coupled diesel oxidation catalyst (DOC).