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Effect of Biodiesel Blends on Urea Selective Catalytic Reduction Catalyst Performance with a Medium-Duty Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 06, 2008 by SAE International in United States
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Testing to investigate biodiesel's impact on the performance of a zeolite-based selective catalytic reduction (SCR) system was conducted. The tests employed a 2004 compliant Cummins ISB with common rail fuel injection, EGR, and variable geometry turbo. This 5.9L, 300HP engine was retrofitted with a Johnson-Matthey DPF + SCR (SCRT™) system. Testing was conducted over eight steady-state engine operating modes which provided a wide range of exhaust temperature and exhaust chemistry conditions. Fuels tested were a 2007 certification quality ultra-low sulfur diesel (ULSD), as well as a soy derived biodiesel in a B20 blend. B20 produced slightly lower catalyst temperatures and higher NO2:NOx ratios relative to ULSD, but no measureable difference in the overall NOx conversion over the SCR system. The dominant variable influencing SCR performance is the catalyst space velocity, which is unchanged with the use of B20. Testing to show how the soot load on the diesel particulate filter (DPF) could influence NO2:NOx and hence NOx conversion in the SCR revealed a very slight reduction in NO2 levels for a heavily loaded filter, but showed no change in NOx conversion. Both engine-out and tailpipe NOx levels were slightly higher for B20; however urea injection rates were fixed at optimal values for ULSD.
CitationWilliams, A., Pedersen, D., Ireland, J., McCormick, R. et al., "Effect of Biodiesel Blends on Urea Selective Catalytic Reduction Catalyst Performance with a Medium-Duty Engine," SAE Technical Paper 2008-01-2484, 2008, https://doi.org/10.4271/2008-01-2484.
- Tyson, K.S. Bozell, J. Wallace, R. Peterson, E. Moens, L. Biomass Oil Analysis: Research Needs and Recommendations NREL/TP-510-34796 Golden, CO: National Renewable Energy Laboratory June 2004
- Sheehan, J. Camobreco, V. Duffield, J. Graboski, M. Shapouri, H. An Overview of Biodiesel and Petroleum Diesel Life Cycles NREL/TP-580-24772 Golden, CO: National Renewable Energy Laboratory May 1998
- Cobb, D. et al. 1991 “Application of Selective Catalytic Reduction (SCR) Technology for NO x Reduction From Refinery Combustion Sources.” Environmental Progress 10 49
- Conway, R. Chatterjee, S. Beavan, A. Goersmann, C. Walker, A. NO x and PM Reduction Using Combined SCR and DPF Technology in Heavy Duty Diesel Applications 2005-01-3548. Society of Automotive Engineers 2005
- Roecker, R. Zhan, R. Stanglmaier, R.H. Feasibility Investigation of a High-Effiency NO x Aftertreatment System for Diesel Engines 2007-01-3983. Society of Automotive Engineers 2007
- Xu, L. Watkins, W. Snow, R. Graham, G. McCabe, R. Lambert, C. Carter R.O. III Laboratory and Engine Study of Urea-Related Deposits in Diesel Urea-SCR After-Treatment Systems 2007-01-1582. Society of Automotive Engineers 2007
- Sluder, C.S. Storey, J. Lewis, S.A. Lewis, L.A. Low Temperature Urea Decomposition and SCR Performance 2005-01-1858. Society of Automotive Engineers 2005
- Acharya, R. Alam, M. Boehman, A.L. Fuel and System Interaction Effects on Urea-SCR Control of NO x in Diesel Exhaust Aftertreatment 2006-01-0638. Society of Automotive Engineers 2006
- Cavataio, G. Girard, J. Patterson, J.E. Montreuil, C. Cheng, Y. Lambert, C. Laboratory Testing of Urea-SCR Formulations to Meet Tier 2 Bin 5 Emissions 2007-01-1575. Society of Automotive Engineers 2007
- Tatur, M. Nanjundaswamy, H. Tomazic, D. Thornton, M. Effects of Biodiesel Operation on Light-Duty Tier 2 Engine and Emission Control Systems 2008-01-0080. Society of Automotive Engineers 2008
- Williams, A. McCormick, R.L. Hayes, R.R. Ireland, J. Fang, H.L. Effect of Biodiesel Blends on Diesel Particulate Filter Performance 2006-01-3280. Society of Automotive Engineers 2006
- Boehman, A.L. Song, J. Alam, M. “Impact of Biodiesel Blending on Diesel Soot and the Regeneration of Particulate Filters.” Energy & Fuels 19 2005 1857
- Song, J. Alam, M. Boehman, A.L. Kim, U. “Examination of the Oxidation Behavior of Biodiesel Soot.” Combustion and Flame 146 2006 589 604
- McCormick, R.L. Tennant, C. Hayes, R.R. Black, S. Williams, A. Ireland, J. McDaniel, T. Frailey, M. Sharp, C.A. Regulated Emissions from Biodiesel Tested in Heavy-Duty Engines Meeting 2004 Emission Standards 2005-01-2200. Society of Automotive Engineers 2005