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An overview of after-treatment systems for diesel engines

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Abstract

Vehicular pollution has become a major problem in urban areas due to the exponential rise in the number of automobiles. Typical exhaust emissions which include nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO), soot, and particulate matter (PM) undoubtedly have an unpleasant effect on the environment. Several pollution control bodies are taking this subject seriously and issuing stringent emission norms which are to be complied strictly. Thus, regulation of these harmful pollutants is the need of the hour. Alternative fuels such as biodiesels and alcohols which are considered as a potentially viable solution for the problem of fossil fuel depletion also tend to require exhaust gas after-treatment in order to comply with the upcoming emission norms. Hence, this paper attempts to give a brief insight on the development and advances of different after-treatment devices like diesel particulate filter (DPF), lean NOx trap (LNT), diesel oxidation catalyst (DOC), and selective catalytic reduction (SCR).

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Abbreviations

A/F:

Air to fuel

CO:

Carbon monoxide

CPSI:

Cells per square inch

C.I:

Compression ignition

DEF:

Diesel exhaust fluid

DOC:

Diesel oxidation catalyst

DPF:

Diesel particulate filter

HC:

Hydrocarbons

LNT:

Lean NOX trap

NOX :

Nitrogen oxides

PAH:

Polycyclic aromatic hydrocarbon

PM:

Particulate matter

SCR:

Selective catalytic reduction

SOx:

Sulfur oxides

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  1. Mechanical Engineering Department, National Institute of Technology Karnataka, Surathkal, 575025, India

    Archit Srinivasacharya Ayodhya & Kumar Gottekere Narayanappa

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Ayodhya, A.S., Narayanappa, K.G. An overview of after-treatment systems for diesel engines. Environ Sci Pollut Res 25, 35034–35047 (2018). https://doi.org/10.1007/s11356-018-3487-8

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