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The Variation of Functional Characteristics of a Euro VI Selective Catalytic Reduction Reactor after Ageing
Technical Paper
2020-01-2205
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The selective catalytic reduction (SCR) of nitrogen oxides by ammonia is commonly applied as a method of exhaust aftertreatment for lean burn compression ignition (CI) engines. The catalytic reactor of an SCR system, like all catalytic emission control devices, is susceptible to partial deactivation as its operating time progresses. Long-term exposure of an SCR reactor to exhaust gas of fluctuating temperature and composition results in variations of the characteristics of its catalytically active layer. The aim of this study was to observe and investigate the variation of parameters characterizing the SCR reactor as a result of its ageing. Attention was paid to changes in ammonia storage capacity, selectivity of chemical reactions and maximum achievable NOx conversion efficiency. The experimental setup was a heavy duty (HD) Euro VI-compliant engine and its aftertreatment system (ATS). The setup was installed on a transient engine dyno instrumented with emission measurement devices. The experimental test plan consisted of execution of World Harmonized Steady Cycle (WHSC) on the fresh and aged SCR reactor, with an ageing protocol run between. The ageing protocol was of novel type, being repetitive execution of type-approval cycles with frequent cold start events. The obtained emission results indicated a significant increase in NOx emission as a result of SCR ageing. Post-SCR NOx concentration traces were analyzed in detail to indirectly evaluate the shift in the reactor’s characteristics. The ammonia storage capacity was found to be one of the contributors of overall NOx conversion efficiency reductions, especially under transient conditions. A further contributor to elevated NOx emission was a decrease of reactor selectivity towards N2O formation. The reactor at both fresh and aged conditions featured a similar NOx conversion efficiency at low and moderate space velocities. The decrease in the reactor’s performance was found to be proportional to the space velocity.
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Dzida, J., Bielaczyc, P., and Brzeżański, M., "The Variation of Functional Characteristics of a Euro VI Selective Catalytic Reduction Reactor after Ageing," SAE Technical Paper 2020-01-2205, 2020, https://doi.org/10.4271/2020-01-2205.Data Sets - Support Documents
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References
- Bielaczyc , P. Global trends in vehicular emissions regulations, current “hot topics” and their impact on powertrain technology VIII International Congress on Combustion Engines organized by PTNSS Krakow 17-18 June 2019
- Joshi , A. Review of Vehicle Engine Efficiency and Emissions SAE Technical Paper 2019-01-0314 2019 https://doi.org/10.4271/2019-01-0314
- Johnson , T. Vehicular Emissions in Review SAE Int. J. Engines 9 1258 1275 2016 https://doi.org/10.4271/2016-01-0919(1)
- Lambert , C. Practical Aspects of Urea SCR for Automotive NO x Control 2018 CLEERS Workshop September 20, 2018
- Halonen , S.H. , Kangas , T. , Haataja , M. , Lassi , U. 2016 10.1007/s40825-016-0051-1
- Majewski , W.A. www.dieselnet.com/tech/cat_scr.php
- Nova , I. , and Tronconi , E. Urea-SCR Technology for DeNO x After Treatment of Diesel Exhaust; Fundamental and Applied Catalysis Springer 2014 467 471 10.1007/978-1-4899-8071-7
- Kamasamudram , K. , Yezerets , A. , chen , X. , Currier , N. et al. New Insights into Reaction Mechanism of Selective Catalytic Ammonia Oxidation Technology for Diesel Aftertreatment Applications SAE Int. J. Engines 4 1 1810 1821 2011 https://doi.org/10.4271/2011-01-1314
- Sala , R. , Bielaczyc , P. , and Brzezanski , M. Concept of Vaporized Urea Dosing in Selective Catalytic Reduction Catalysts 7 307 2017 10.3390/catal7100307
- Haga , H. , Kojima , H. , Fukushi , N. , Ohya , N. et al. Optimized NH3 Storage Control for Next Generation Urea-SCR System SAE Technical Paper 2015-01-1024 2015 https://doi.org/10.4271/2015-01-1024
- Colombo , M. , Nova , I. , and Tronconi , E. A comparative study of the NH 3 -SCR reactions over a Cu-zeolite and a Fe-zeolite catalyst Catalysis Today 151 223 230 2010 10.1016/j.cattod.2010.01.010
- Ruggeri , M.P. , Grossale , A. , Nova , I. , Tronconi , E. et al. FTIR in situ mechanistic study of the NH 3 NO/NO 2 “Fast SCR” reaction over a commercial Fe-ZSM-5 catalyst Catalysis Today 184 107 114 2012 https://doi.org/10.1016/j.cattod.2011.10.036
- Moshoeshoe , M. , Nadiye-Tabbiruka , M.S. , and Obuseng , V. A Review of the Chemistry, Structure, Properties and Applications of Zeolites American Journal of Materials Science 7 5 196 221 2017 10.5923/j.materials.20170705.12
- Dzida , J. , and Brzeżański , M. An analysis of SCR reactor deactivation impact on NO x emissions from a compression ignition engine Combustion Engines 178 3 208 212 2019 10.19206/CE-2019-336
- Ma , Y. , and Wang , J. Control of aged automotive selective catalytic reduction systems for consistent performances Journal of the Franklin Institute 354 8094 8116 2017 https://doi.org/10.1016/j.jfranklin.2017.10.003
- Shwan , S. 3 2014 978-91-7597-103-2
- Li , G. , Pidko , E.A. , Van Santen , R.A. , Li , C. , and Hensen , E.J.M. Stability of Extraframework Iron-Containing Complexes in ZSM-5 Zeolite The Journal of Physical Chemistry C 117 2013 doi.org/10.1021/jp310374k
- Bartholomew , C.H. Mechanisms of catalyst deactivation Applied Catalysis A: General 212 2001 17 60
- Silver , R.G. , Stefanick , M.O. , and Todd , B.I. A study of chemical aging effects on HDD Fe-zeolite SCR catalyst Catalysis Today 136 28 33 2008 https://doi.org/10.1016/j.cattod.2007.11.063
- Cavataio , G. , Jen , H. , Girard , J. , Dobson , D. et al. Impact and Prevention of Ultra-Low Contamination of Platinum Group Metals on SCR Catalysts Due to DOC Design SAE Int. J. Fuels Lubr. 2 1 204 216 2009 https://doi.org/10.4271/2009-01-0627
- Theis , J. The Poisoning and Desulfation Characteristics of Iron and Copper SCR Catalysts SAE Int. J. Fuels Lubr. 2 1 324 331 2009 https://doi.org/10.4271/2009-01-0900
- Toops , T.J. , Nguyen , K. , Foster , A.L. , Bunting , B.G. et al. Deactivation of accelerated engine-aged and field-aged Fe-zeolite SCR catalysts Catalysis Today 151 257 265 2010 10.1016/j.cattod.2010.01.019
- Wang , A. , Wang , Y. , Walter , E.D. , Washton , N.M. et al. NH 3 -SCR on Cu, Fe and Cu + Fe exchanged beta and SSZ-13 catalysts: Hydrothermal aging and propylene poisoning effects Catalysis Today 320 15 January 2019 doi.org/10.1016/j.cattod.2017.09.061
- Selleri , T. , Nova , I. , Tronconia , E. , Schmeisser , V. , and Seher , S. The impact of light and heavy hydrocarbons on the NH3-SCR activity of commercial Cu- and Fe-zeolite catalysts Catalysis Today 320 100 111 2019 doi.org/10.1016/j.cattod.2017.09.028
- Girard , J. , Snow , R. , Cavataio , G. , and Lambert , C. Influence of Hydrocarbon Storage on the Durability of SCR Catalysts SAE Technical Paper 2008-01-0767 2008 https://doi.org/10.4271/2008-01-0767