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How does diesel exhaust fluid (DEF) work in a selective catalytic reduction (SCR) system?

April 26, 2017Catalytic def diesel exhaust fluid reduction SCR selective system

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How does diesel exhaust fluid (DEF) work in a selective catalytic reduction (SCR) system?

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Small quantities of DEF are introduced into the exhaust stream and, when mixed with the nitrogen oxide (NOx) emissions, changes into harmless nitrogen gas and water vapor. Nitrogen makes up 78 percent of the air we breathe.