An experimental study on aging effects of the air–fuel ratio swing on modern gasoline three-way catalysts

Springer Science and Business Media LLC - Tập 8 - Trang 177-192 - 2023
René Eickenhorst1,2, Thomas Koch1
1IFKM (Institut für Kolbenmaschinen), KIT, Karlsruhe, Germany
2Mercedes-AMG GmbH, Affalterbach, Germany

Tóm tắt

Today’s governmental legislations require region specific emission standards for passenger vehicles. Continuously increasing legal requirements demand the development of more complex exhaust gas after treatment systems to further reduce harmful gases like carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). Due to specific load profiles and other boundary conditions, the efficiency of the aftertreatment system declines over lifecycle, so that the emissions might increase. Consequently, the durability of the system becomes a critical design parameter with upcoming legislation demanding emissions stability over the vehicle life cycle. Within this publication, catalyst aging effects due to air–fuel ratio (AFR) swing are analyzed experimentally. To create catalyst aging conditions, a modern eight-cylinder turbocharged engine was modified and specific aging cycles with a variation of AFR swing amplitude and frequency were conducted. Light-off curves were used to depict the negative impact of the AFR swing on the aging catalyst systems. A higher swing frequency resulted in an increased temperature amplitude within the entrance area of the catalyst, while an elevated amplitude lead to more exothermic heat release and stronger aging over the complete catalyst, as visualized via conversion maps. A theoretical calculation of thermal loads by Arrhenius equation supports the results and indicates the direction of supplementary experimental approaches.

Tài liệu tham khảo

Europäischen Union (EU): Zur Ergänzung der Verordnung (EG) Nr. 715/2007 des Europäischen Parlaments und des Rates über die Typgenehmigung von Kraftfahrzeugen hinsichtlich der Emissionen von leichten Personenkraftwagen und Nutzfahrzeugen (Euro 5 und Euro 6), EU Verordnung 2017/1151 (2017)

European Union (EU): Regulation (EC) No 715/2007 of the European Parliament and of the Council of 20 June 2007 on type approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance), Regulation Number: 715/2007 (EC) (Euro 5/Euro 6) (2018/858) (2018)

European Commission: Proposal for a regulation of the European Parliament and the Council on type-approval of motor vehicles and engines and of systems, components and separate technical units intended for such vehicles, with respect to their emissions and battery durability (Euro 7) and repealing Regulations (EC) No 715/2007 and (EC) No 595/2009, COM(2022) 586 final ANNEXES 1 to 6 (2022)

Riegel, J., Neumann, H., Wiedenmann, H.-M.: Exhaust gas sensors for automotive emission control. Solid State Ionics. Elsevier (2002)

Louen, C.J.: Datenbasierte Zustandsüberwachung in Personenkraftwaren mit Anwendung an einem Drei-Wege-Katalysator. Springer (2016)

Feßler, D.K.: Modellbasierte On-Board-Diagnoseverfahren für Drei-Wege-Katalysatoren. Instituts für Regelungs- und Steuerungssysteme, Karlsruher Institut für Technologie (2010)

Lassi, U.: Deactivation correlations of PD/RH three-way catalysts designed for EURO IV emission limits. Department of Process and Environmental Engineering, University of Oulu (2003)

Hagelücken, C., Tilgner, I.-C.: Autoabgaskatalysatoren, expert Verlag (2016)

Zheng, T., Lu, B., Harle, G., Yang, D., Wang, C., Zhao, Y.: A comperative study on Rh-only, Pd-only and Pd/Rh catalysts. Applied catalysis A, general. Elsevier (2020)

Odendall, B.: Ein vereinfachtes Modell des Lambda-geregelten Dreiwegekatalysators zum Einsatz in Motor-Steuergeräten zur On-Board-Diagnose. Energie-, Verfahrens- und Biotechnik der Universität Stuttgart, Universität Stuttgart (2003)

Koltsakis, G.C., Stamatelos, A.M.: Catalytic automotive exhaust aftertreatment. Prog. Energy Combust. Sci. 23 (1997)

Sabertec, L.L.C.: Three-way catalysts: aging, causes of failure and deactivation (2022). https://www.ecooptimized.com/index.php/gasoline/80-three-way-catalysts-aging-causes-of-failure-and-deactivation-.html. Accessed on 28th Nov 2022

Beck, D.D., Sommers, J.W., DiMaggio, C.L.: Impact of sulfur on model palladium-only catalysts under simulated three-way operation, applied catalysis environmental. Elsevier Science B V (1993)

Taha, R., Duprez, D., Mouaddib-Moral, N., Gauthier, C.: Oxygen storage capacity of three-way catalysts: a global test for catalyst deactivation. Catalysis and automotive pollution control IV. Elsevier Science B.V. (1998)

Winkelhofer, E., Hirsch, A., Philipp, H., Trifterer, M., Berglez, M.: Powertrain calibration techniques, SAE International (SAE 2019-24-0196) (2019)

Gong, C., Huang, K., Deng, B., Liu, X.: Catalyst light-off behavior of a spark-ignition LPG (liquefied petroleum gas) engine during cold start, energy. Elsevier (2011)

Samimi, O., Abdolmaleki, S., Rudaki, J.: Comparison of aged and fresh automotive three-way catalysts in real driving. In: Sixth International Conference on Internal Combustion Engines (2009)

Brisley, R.J., O'Sullivan, R.D., Wilkins, A.J.J.: The effect of high temperature ageing on Platinum–Rhodium and Palladium–Rhodium three way catalysts. International Congress & Exposition, SAE Technical Paper (1991)

Flynn, P.C., Wanke, S.E., Turner, P.S.: The limitation of the transmission electron microscope for characterization of supported metal catalysts. J. Catal. 33 (1973)

Galassi, M.C., Martini, G.: Durability demonstration procedures of emission controll devices für Euro 6 vehicles, JRC Science and policy reports. Publications Office of the European Union (2014)

Sideris, M.: Methods for monitoring and diagnosing the efficiency of catalytic converters, vol. 115. Studies in surface science and catalysis. Elsevier (1998)

Descorme, C., Taha, R., Mouaddib-Moral, N., Duprez, D.: Oxygen storage capacity measurement of three-way catalysts under transient conditions, applied catalysis A. Elsevier (2022)

Cybulski, A., Moulijn, J.A.: Monoliths in heterogeneous catalysis. Catal. Rev. Sci. Eng. (1994)

EPA (Environmental Protection Agency): Emission durability procedures and component durability procedures for new light-duty vehicles, light-duty trucks and heavy-duty vehicles; final rule and proposed rule, EPA—Federal Register, vol. 71, no. 10, 40 CFR Part 86 (2006)

Ignatov, D., Küpper, C., Pischinger, S., Bahn, M., Betton, W., Rütten, O., Weinowski, R.: Catalyst aging method for future emissions standard requirements. SAE International (2010)

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Springer Science and Business Media LLC

Tập 8

177-192

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