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NO x reduction in the exhaust of mobile heavy-duty diesel engines by urea-SCR

Koebel, M. ; Elsener, M. ; Kröcher, O. ; Schär, Ch ; Röthlisberger, R. ; Jaussi, F. ; Mangold, M.

In: Topics in Catalysis, 2004, vol. 30-31, no. 1-4, p. 43-48

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    Titel
    • NO x reduction in the exhaust of mobile heavy-duty diesel engines by urea-SCR
    Autor
    • Koebel, M.. Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
    • Elsener, M.. Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
    • Kröcher, O.. Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
    • Schär, Ch. Measurement and Control Laboratory, Swiss Federal Institute of Technology, CH-8092, Zurich, Switzerland
    • Röthlisberger, R.. Liebherr Machines Bulle SA, CH-1630, Bulle, Switzerland
    • Jaussi, F.. Liebherr Machines Bulle SA, CH-1630, Bulle, Switzerland
    • Mangold, M.. Oberland Mangold GmbH, D-82467, Garmisch-Partenkirchen, Germany
    Dokumententyp
    • Postprint
    OAI-PMH-ID
    • oai:doc.rero.ch:319071
    Summary
    A DeNO x demonstration system for a diesel engine used in construction machineries and mobile cranes was setup. In preliminary experiments various extruded and coated SCR catalysts were evaluated with and without oxidizing pre-catalyst. The data from stationary tests with two selected catalysts were used to establish various model-based control algorithms for the optimum dosage of urea in the ESC and ETC. A NO x conversion of >93% at <10ppm average ammonia slip could be achieved at a converter-to-swept volume ratio of <2.0