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Simultaneous Real-Time Measurements of NO and NO2 in Medium Duty Diesel Truck Exhaust
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
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The goal of the present work was to investigate the ability of the SEMTECH®-D Portable Emissions Measurement System (PEMS) to provide simultaneous, accurate, real-time (1Hz) measurements of NO and NO2 in vehicle exhaust. Extensive chassis dynamometer laboratory evaluation studies of the SEMTECH® system were conducted. The instantaneous (1Hz) NOx emissions were measured using a conventional chemiluminescence analyzer (CLA) and were compared to the sum of the instantaneous NO and NO2 measurements from the SEMTECH®-D. The sum of the NO and NO2 emissions measured by the SEMTECH® were in excellent agreement (within 95% in most cases) with the total NOx measurements from the conventional CLA.
During the laboratory evaluation studies, several Federal Test Procedure (FTP) drive cycles were conducted. Examples of the NO and NO2 concentration and mass emissions measured using the SEMTECH®-D are presented along with the corresponding SEMTECH®-D detection limits. From the data it is clearly evident that the NO and the NO2 levels measured were, in most cases, well above the detection limits of the SEMTECH®-D. The results also indicate that for the vehicles tested in this study, the SEMTECH® system can easily distinguish differences between NOx, NO, and NO2 emissions measured during cold start transient phase (Bag 1) and the hot start transient phase (Bag 3) of the FTP.
The SEMTECH®-D PEMS utilizes a sample gas conditioning unit prior to the analyses of NO and NO2. Therefore, studies were also conducted to evaluate potential losses of NO2 via adsorption, condensation, and reactions with the water that may accumulate in the condenser of the sample conditioning unit. The results of these studies indicate that for NO2 concentrations of less than ∼300 ppm (the range of NO2 typically emitted from the vehicles tested) the losses in the SEMTECH® system were comparable to those losses of NO2 that may be attributable to NOx converter efficiencies (> 95% efficient, as specified in the Code of Federal Regulations) in conventional laboratory analyzers (1).
CitationGierczak, C., Korniski, T., Wallington, T., and Ensfield, C., "Simultaneous Real-Time Measurements of NO and NO2 in Medium Duty Diesel Truck Exhaust," SAE Technical Paper 2007-01-1329, 2007, https://doi.org/10.4271/2007-01-1329.
- U.S. Code of Federal Regulations, Title 40, Part 1065, subpart D, § 1065.378.
- Morin, J.P., “From Particles to NO2 as Main Diesel Emissions Toxic Trigger: A Link with After-Treatment Strategies”, SCAQMD Ultrafine Particles Conference, Los Angeles, CA, April 30 - May 2, 2006.
- Colvin, A.D., and Warnick, A., U.S. Patent No. 3746513, U.S. Patent No. 3746514, July 17, 1973.
- Thalagavara, A.M., Johnson, J.H., Bagley, S.T., and Shende, A.S., “The Effects of a Catalyzed Particulate Filter and Ultra Low Sulfur Fuel on Heavy Duty Diesel Engine Emissions”, Technical Paper No. 2005-01-0473, 2005 SAE World Congress, Detroit, MI, April 11-14, 2005.
- Lakkireddy, V.R., Mohammed, H., Johnson, J.H., and Bagley, S.T., “The Effect of a Diesel Oxidation Catalyst and a Catalyzed Particulate Filter on the Emissions from a Heavy Duty Diesel Engine”, Technical Paper No. 2006-01-0875, 2006 SAE World Congress, Detroit, MI, April 3-6, 2006.
- LeTavec, C., Uihlein, J., Vertin, K., Chatterjee, S., Hallstrom, K., Wayne, S., Clark, N., Gautam, M., Thompson, G., Lyons, D., Chandler, K., and Coburn, T., “Year-Long Evaluation of Trucks and Buses Equipped with Passive Diesel Particulate Filters”, Technical Paper No. 2002-01-0433, 2002 SAE World Congress, Detroit, MI, March 4-7, 2002.
- Richards, P., Terry, B., and Pye, D., “Experience of Fitting London Black Cabs with Fuel Borne Catalyst Assisted Diesel Particulate Filters - Part 2 Non-Regulated Emissions Measurements”, Technical Paper No. 2002-01-2785, 2002 SAE Powertrain & Fluid Systems Conference & Exhibition, San Diego, CA, Oct. 21-24, 2002.
- Richards, P. and Kalischewski, W., “Retrofitting of Diesel Particulate Filters - Particulate Matter and Nitrogen Dioxide”, Technical Paper No. 2003-01-1883, SAE International Spring Fuels & Lubricants Meeting, Yokohama, Japan, May 19-22, 2003.
- Richards, P., Terry, B., Chadderton, J., and Vincent, M.W., “Retrofitting Urban Buses to Reduce PM and NO2”, Technical Paper No. 2004-01-1939, SAE Fuels & Lubricants Meeting & Exhibition, Toulouse, France, June 8-10, 2004.
- Gierczak, C.A. and Ensfield, C., “Evaluation of SEMTECH-D™ Long-Term Measurement Accuracy”, 15th CRC On-Road Vehicle Emissions Workshop, San Diego, CA, April 4-6, 2005.
- Dearth, M. A., Butler, J. W., Colvin, A., Gierczak, C., Kaberline, S., and Korniski, T., “SemtechD: The Chassis Roll Evaluation of a Commercial Portable Emission Measurement System (PEMS)”, Technical Paper No. 2005-01-0673, 2005 SAE World Congress, Detroit, MI, April 11-14, 2005.
- Gierczak, C.A., Brooks, T., Korniski, T.J., Wallington, T.J., and Ensfield, C., “Laboratory Evaluation of SEMTECH-D® Long-Term Measurement Accuracy”, 2nd Annual SUN Conference, Ann Arbor, MI, Sept. 26-27, 2005.
- U.S. Code of Federal Regulations, Title 40, Part 86 and Title 40, Part 600.