This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Evaluation of NOx Storage Catalysts for Lean Burn Gasoline Fueled Passenger Cars
Annotation ability available
Sector:
Language:
English
Abstract
Engine and laboratory tests were carried out to examine the performance of NOx adsorption catalysts for gasoline lean burn engines in fresh and aged condition. The results show that fresh NOx adsorption catalysts have the potential to meet EURO III emission standards. However, to accomplish these the fuel must contain a low sulfur concentration and the engine must be tuned to optimize the efficiency of the catalyst. After engine or furnace aging upto 750°C the catalyst shows some loss of NOx adsorption efficiency. This deterioration can be offset somewhat by increasing the frequency of lean/rich switching of the engine. Temperatures higher than 750°C may cause an irreversible destruction of the NOx, storage features while the three-way activity of the catalyst remains intact or even may improve. With reference to several physicochemical investigations it is believed that the detrimental effect of catalyst aging is attributed to two different deactivation modes. The first can be traced back to the reaction of the adsorbents with other washcoat ingredients, i.e. alumina (Al2O3), zirconia (ZrO2) or titania (TiO2) resulting in the formation of the corresponding aluminates, zirconates and titanates. The second deactivation mode is attributed to a significant particle growth of both the precious metal and the adsorbents leading to a substantial loss of interface between these two components. This loss of interface reduces the rate of spill-over Of NO2 from the precious metal active sites onto the adsorbents, and hence reduces the NOx adsorption efficiency.
Recommended Content
Authors
- N. Fekete - Mercedes-Benz AG
- R. Kemmler - Mercedes-Benz AG
- D. Voigtländer - Daimler-Benz AG
- B. Krutzsch - Daimler-Benz AG
- E. Zimmer - Daimler-Benz AG
- G. Wenninger - Daimler-Benz AG
- W. Strehlau - Degussa AG
- J. A. A. van den Tillaart - Degussa AG
- J. Leyrer - Degussa AG
- E. S. Lox - Degussa AG
- W. Müller - Degussa AG
Citation
Fekete, N., Kemmler, R., Voigtländer, D., Krutzsch, B. et al., "Evaluation of NOx Storage Catalysts for Lean Burn Gasoline Fueled Passenger Cars," SAE Technical Paper 970746, 1997, https://doi.org/10.4271/970746.Also In
References
- Mitsubishi “Mitsubishi GDI Engine” Technical Information 1996
- Toyota Motor Corporation “Direct-Injection 4- Stroke Gasoline Engine” Press Information 1996
- Jen H.W. McCabe R.W. Gorte R.J. Parrillo D.J. “Reduction of NO under Lean Conditions over ZSM5-Based Catalysts: Effect of Cu-Loading and Zeolite-Type” Symposium on NO x Reduction, 207th National Meeting American Chemical Society San Diego, CA March 13-18 104 1994
- Iwarnoto M. Hamada H. “Removal of Nitrogen Monoxide from Exhaust Gases Through New Catalytic Processes” Catalysis Today 10 57 71 1991
- Held W. König A. Richter T. Puppe L. “Catalytic NO x -reduction in Net Oxidizing Exhaust Gas” SAE Technical Paper series, SAE 900496 1990
- Shelef M. “Selective Catalytic Reduction of NO x with N-free Reductants” Chem. Rev. 95 209 1995
- Ross J.R.H. Catalysis Today 22 Elsevier Amsterdam Lausanne New York Oxford Shannon Tokyo 1994
- Kharas K.C.C. Robota H.J. Liu D.J. “Deactivation in Cu-ZSM-5 Lean-Burn Catalysis” Applied Catalysis B: Environmental 2 225 237 1993
- Tabata T. Kokitsu M. Okada O. Nakayama T. Yasumutsu T. Sakane H. “Deterioration mechanism of Cu/ZSM-5 as a catalyst of selective reduction of NO x by hydrocarbons from the exhaust of stationary natural gas fuelled engine” Studies in Surface Science and Catalysis 88 1994 Elsevier Science B.V.
- Grinsted R.A. Jen H.-W. Montreuil C.N. Rokosz M.J. Shelef M. “The relation between deactivation of CuZSM-5 in the selective reduction of NO and dealumination of the zeolite” Zeolites 13 602 1993
- Miyoshi N. Matsumoto S. Kato K. Tankak T. Harada J. Takahashi N. Yokota K. Sugiura M. Kasahara K. “Development of new concept three-way catalyst for automotive lean burn engines” SAE 950809 1995
- Kato K. Nohira H. Nakanish K. Iguchi S. Kihara T. Muraki H. Toyota European Patent Application 0 573 672 Al 1996
- Kraemer M. Maly R.R. Willand J. Pischinger S. Krutzsch B. Gruden I. Voigtländer D. “Emissionsreduzierung beim mager betriebenen Ottormotor” 16th International Wiener Motorensymposium 1996
- Brogan M.S. Brisley R.J. Moore J.S. Clark A.D. “Evaluation of NO x ,, Adsorber Catalysts Systems to Reduce Emissions of Lean Running Gasoline Engines” SAE 962045 1996
- Lütkemeyer G. Weinowski R. Lepperhoff G. Brogan M.S. Brisley R.J. Wilkins A.J.J. “Comparison of DeNO x and Adsorber Catalysts to Reduce NO x -Emissions of Lean Burn Gasoline Engines” SAE 962046 1996
- Hepburn J.S. Thanasiu E. Dobson D.A. Watkins W.L. “Experimental and Modeling Investigations of NO x Trap Performance SAE 962051 1996
- Strehlau W. Leyrer J. Lox E.S. Kreuzer T. Hori M. Hoffmann M. “New Developments in Lean NO x Catalysis for Gasoline Fueled Passenger Cars in Europe” SAE 962047 1996
- Brogan M.S. Brisley R.J. Walker A.P. Webster D.E. Boegner W. Fekete N.P. Krämer M. Krutzsch B. Voigtländer D. “Evaluation of NO x Storage Catalysts as an Effective System for NO x Removal from Exhaust Gas Lean burn Gasoline Engines” SAE 952490 1995
- Leyrer J. Lox E.S. Strehlau W. “Design Aspects of Lean NO x Catalysts for Gasoline and Diesel Applications” SAE 952495 1995
- Fekete N.P. Nester U. Gruden I. Powell J.D. “Model Based Air-Fuel Ratio Control of a Lean Burn Multi-Cylinder Engine” SAE 950846 1995
- Scholten J.F.F. Pijpers A.P. Hustings A.M.L. Catal. Rev.-Sci. Eng. 27 151 1985
- 218 1958