: Across the globe, researchers are concentrating on to reduce the tail pipe emissions, which have high environmental impact either by adapting to new technologies or alternate fuels or both. Soybean oil methyl ester (SOME) is chosen as alternative fuel for diesel engines. It is renewable, non-toxic and offer potential reduction in CO; HC and smoke emissions due to higher O 2 contents in it compared to diesel fuel but higher nitrogen oxides (NOx) emission. Nitrogen oxides (NOx) in the atmosphere cause serious environmental problems, such as photochemical oxidant, acid rain, and global warming. The removal of nitrogen oxides (NOx) from the exhaust of diesel engines is still a very challenging problem even though there have been many studies. Technologies available for NOx reductions either enhance other polluting gas emissions or increase fuel consumptionThe objective of this work is to investigate the possibility of decreasing the NOx emissions in the tail pipe of a diesel engine. Injection of aqueous solutions of urea in the tail pipe of a diesel engine for the reduction of oxides of nitrogen (NOx) was carried out in a four stroke, single cylinder, water cooled, constant speed diesel engine fuelled with Soybean oil methyl ester (SOME). Four observations were made for the exhaust emission NOx analysis of concentration of urea solution 0%, 10%, 20%, and 30% by weight with different flow rates of urea solution as reductant by fitting Marine Ferromanganese nodule as SCR catalyst. It was observed that 60.56% of NOx reduction achieved.
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