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Application of Organic Freeze-Point Depressants in Aqueous Urea Solutions: Effect on NOx Reduction
Technical Paper
2003-01-0775
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Aqueous urea solutions are being considered for use on light-duty diesel vehicles to reduce engine-out NOx to 2007 Tier II Bin 5 levels (0.07 g/mi NOx). A 32.5 wt% urea solution freezes at approximately 12°F (-11°C). This is a challenge for use in colder climates. Propylene glycol is a safe and effective freeze point depressant, providing protection down to 0°F (-18°C). A solution of aqueous urea and propylene glycol was used during a series of transient dynamometer experiments performed with a 1.2 L diesel engine. A detrimental effect on NOx conversion was observed, and tailpipe emissions of HC dramatically increased. Results were confirmed in a laboratory flow reactor, along with effects of other proposed additives such as methanol and ethanol.
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Authors
Citation
Lambert, C., Montreuil, C., and Vanderslice, J., "Application of Organic Freeze-Point Depressants in Aqueous Urea Solutions: Effect on NOx Reduction," SAE Technical Paper 2003-01-0775, 2003, https://doi.org/10.4271/2003-01-0775.Also In
Diesel Emission Measurement, Modeling, & Control from the SAE 2003 World Congress on CD-ROM
Number: SP-1754CD; Published: 2003-03-03
Number: SP-1754CD; Published: 2003-03-03
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