Examination of the ammonia dose influence on nitric oxides transformations into combined oxide - platinum SCR catalyst

• Autorzy: Kamela W. , Kruczyński S.
• Języki publikacji: EN

Abstrakty

EN

This paper presents the test results obtained from the combined oxide-platinum catalytic reactor used in the NH3-SCR system. The first reactor block was extracted from the oxide catalyst used in trucks. As the second module of the reactor a block with platinum acting as a catalyst was used with 2.5g/dm3 platinum load. During the tests the ammonia concentrations in the engine exhaust gases at the inlet of the reactor system were set to 240, 320 and 400 ppm. The article contains the results of the physical and chemical active surface structure tests of both reactor blocks with their active surface chemical microanalysis and its topographic pictures performed and taken with the Scanning Electron Microscope. The results of the NOX and NO conversion and the content of NO2 in NOX are presented in this paper as the function of combined reactors system operating temperature with three different ammonia concentrations in the exhaust gases. Additionally, the results of the measured ammonia slip at the outlet of the combined reactor were presented. The obtained results have shown that the increase in ammonia dose at the inlet of the system increases the nitric oxides conversion with the minimum influence on the ammonia slip. By using the platinum based catalyst block it was possible to widen the whole reactor system effective operating temperature due to the high nitric oxides conversion efficiency of the platinum block achieved at low operating temperatures. A low ammonia slip at the outlet of the combined catalytic reactor was obtained by use of the platinum reactor block whose properties allow for the high ammonia conversion.

Słowa kluczowe

EN

combustion engines; catalytic reactors; selective reduction; nitric oxides; air pollution

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 253--258
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Kamela W.

autor

Kruczyński S.

• Warsaw University of Technology Institute of Vehicles Narbutta Street 84, 02-524 Warszawa, Poland tel.: [phone], fax: [phone],

Bibliografia

• [1] Lambert, Ch., Williams, S., Carberry, B., Koehler, E., Tomazic, D., Urea SCR and CDPF System for a Tier 2 Light-Duty Truck, Aachener Kolloquium Fahrzeug und Motorentechnik 2006.
• [2] Gieshoff, J., Improved SCR Systems for Heavy Duty Applications, SAE Paper No. 2000-01- 0189, SAE International, Warrendale, PA 2000.
• [3] Janssen, J., Environmental Catalysis – Stationary Sources, in Handbook of Heterogeneous Catalysis. Ertl G., Wiley J., pp. 1636-1644, New York 1997.
• [4] Heck, R. M., Operating Characteristics and Commercial Operating Experience with High Temperature SCR NOX Catalyst, Environmental Progress 13,4, pp. 221-225, 1994.