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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
Diesel fuel is a mixture of thousands of hydrocarbon compounds, most of which have carbon numbers between 10 and 22. A typical carbon number distribution in diesel fuel is shown in Figure 2 [1149]. Most of the compounds in diesel fuel are hydrocarbons of the paraffinic, naphthenic, or aromatic class.