Diesel exhaust fluid
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Diesel exhaust fluid is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. DE
A 1.5-liter and a 10-liter AdBlue container
Hino truck and its SCR next to the diesel particulate filter (DPF) with regeneration process by the late fuel injection to control exhaust temperature to burn off soot
Passenger car using an AdBlue pump
Urea
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Urea, also called carbamide, is an organic compound with chemical formula CO2. This amide has two amino groups joined by a carbonyl functional group. It is thus the simplest amide of carbamic acid.
Diesel exhaust fluid
…and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water. DEF is consumed in a selective catalytic reduction (SCR) that lowers the concentration of…
Sample of Urea
![Structure of [Fe(urea)6]2+ showing intramolecular hydrogen bonds. Color code: blue = N, red = O.](https://upload.wikimedia.org/wikipedia/commons/thumb/8/82/CSD_CIF_WITQEV.jpg/500px-CSD_CIF_WITQEV.jpg)
Structure of [Fe(urea)6]2+ showing intramolecular hydrogen bonds. Color code: blue = N, red = O.
A plant in Bangladesh that produces urea fertilizer
Urea plant using ammonium carbamate briquettes, Fixed Nitrogen Research Laboratory, ca. 1930