In consequence of their efficiency and torque, diesel engines have long been valued, especially for heavy-duty applications. But worries about their emissions—especially those of nitrogen oxides (NOx) and particulate matter (PM)—have prompted stricter laws all around the world. Modern emission control technologies for lowering NOx and PM emissions from automotive diesel engines are reviewed in this paper. There is discussion of several methods, such as diesel particulate filters (DPF), selective catalytic reduction (SCR), exhaust gas recirculation (EGR), and newer technologies like diesel oxidation catalysts (DOC) and lean NOx traps (LNT). The challenges and potential paths for developing emission control technologies to meet ever-tougher emission regulations while preserving engine efficiency are also covered in this paper.

Keywords: NOx, diesel oxidation catalysts, EGR, selective catalytic reduction, particulate matter

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1. Biswas, S., Hu, S., Verma, V., Herner, J. D., Robertson, W. H., Ayala, A., & Sioutas, C. (2008). Physical properties of particulate matter (PM) from late model heavy-duty diesel vehicles operating with advanced PM and NOx emission control technologies. Atmospheric Environment, 42(22), 5622-5634.
2. Johnson, B. T. (2008). Diesel engine emissions and their control. Platinum Metals Review, 52(1), 23-37.
3. Walker, A. P. (2004). Controlling particulate emissions from diesel vehicles. Topics in catalysis, 28, 165-170.
4. Shoji, A., Kamoshita, S., Watanabe, T., Tanaka, T., & Yabe, M. (2004). Development of a simultaneous reduction system of NOx and particulate matter for light-duty truck. SAE transactions, 282-291.
5. Mohankumar, S., & Senthilkumar, P. (2017). Particulate matter formation and its control methodologies for diesel engine: A comprehensive review. Renewable and Sustainable Energy Reviews, 80, 1227-1238.
6. Sperl, A. (2011). The influence of post-injection strategies on the emissions of soot and particulate matter in heavy duty euro v diesel engine (No. 2011-36-0350). SAE Technical Paper.
7. Heeb, N. V., Zimmerli, Y., Czerwinski, J., Schmid, P., Zennegg, M., Haag, R., ... & Mayer, A. (2011). Reactive nitrogen compounds (RNCs) in exhaust of advanced PM–NOx abatement technologies for future diesel applications. Atmospheric environment, 45(18), 3203-3209.
8. Makwana, N. R., & Dabhi, S. K. (2013). Automotive Exhaust Technology after Treatment for the Reduction of Emission-A Review Study. J. Eng. Res. Technol.(IJERT), 2, 876-880.
9. Feng, X., Ge, Y., Ma, C., Tan, J., Yu, L., Li, J., & Wang, X. (2014). Experimental study on the nitrogen dioxide and particulate matter emissions from diesel engine retrofitted with particulate oxidation catalyst. Science of the total environment, 472, 56-62.

In consequence of their efficiency and torque, diesel engines have long been valued, especially for heavy-duty applications. But worries about their emissions—especially those of nitrogen oxides (NOx) and particulate matter (PM)—have prompted stricter laws all around the world. Modern emission control technologies for lowering NOx and PM emissions from automotive diesel engines are reviewed in this paper. There is discussion of several methods, such as diesel particulate filters (DPF), selective catalytic reduction (SCR), exhaust gas recirculation (EGR), and newer technologies like diesel oxidation catalysts (DOC) and lean NOx traps (LNT). The challenges and potential paths for developing emission control technologies to meet ever-tougher emission regulations while preserving engine efficiency are also covered in this paper.

Keywords: NOx, diesel oxidation catalysts, EGR, selective catalytic reduction, particulate matter

🔒 This is a subscription article

Full text is available to subscribers and institutional members. Please choose an option below to access it.

1. Biswas, S., Hu, S., Verma, V., Herner, J. D., Robertson, W. H., Ayala, A., & Sioutas, C. (2008). Physical properties of particulate matter (PM) from late model heavy-duty diesel vehicles operating with advanced PM and NOx emission control technologies. Atmospheric Environment, 42(22), 5622-5634.
2. Johnson, B. T. (2008). Diesel engine emissions and their control. Platinum Metals Review, 52(1), 23-37.
3. Walker, A. P. (2004). Controlling particulate emissions from diesel vehicles. Topics in catalysis, 28, 165-170.
4. Shoji, A., Kamoshita, S., Watanabe, T., Tanaka, T., & Yabe, M. (2004). Development of a simultaneous reduction system of NOx and particulate matter for light-duty truck. SAE transactions, 282-291.
5. Mohankumar, S., & Senthilkumar, P. (2017). Particulate matter formation and its control methodologies for diesel engine: A comprehensive review. Renewable and Sustainable Energy Reviews, 80, 1227-1238.
6. Sperl, A. (2011). The influence of post-injection strategies on the emissions of soot and particulate matter in heavy duty euro v diesel engine (No. 2011-36-0350). SAE Technical Paper.
7. Heeb, N. V., Zimmerli, Y., Czerwinski, J., Schmid, P., Zennegg, M., Haag, R., ... & Mayer, A. (2011). Reactive nitrogen compounds (RNCs) in exhaust of advanced PM–NOx abatement technologies for future diesel applications. Atmospheric environment, 45(18), 3203-3209.
8. Makwana, N. R., & Dabhi, S. K. (2013). Automotive Exhaust Technology after Treatment for the Reduction of Emission-A Review Study. J. Eng. Res. Technol.(IJERT), 2, 876-880.
9. Feng, X., Ge, Y., Ma, C., Tan, J., Yu, L., Li, J., & Wang, X. (2014). Experimental study on the nitrogen dioxide and particulate matter emissions from diesel engine retrofitted with particulate oxidation catalyst. Science of the total environment, 472, 56-62.