This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Impact of Alkali Metals on the Performance and Mechanical Properties of NOx Adsorber Catalysts
Technical Paper
2002-01-0734
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Performance of two types of NOx adsorber catalysts, one based on Ba and the other based on Ba with alkali metals, was compared fresh and after thermal aging. Incorporation of sodium(Na), potassium(K) and cesium(Cs) into NOx adsorber washcoat containing barium significantly increases the NOx conversions in the temperature range of 350-600°C over that of the alkali metal free NOx adsorber catalysts. NOx performance benefit and HC performance penalty were observed on both engine dynamometer and vehicle tests for the “Ba+alkali metals” NOx adsorber catalysts. “Ba+alkali metals” NOx adsorber catalysts also demonstrate superior sulfur resistance with better NOx performance after repeated sulfur poisonings and desulfations over the “Ba based” NOx adsorber catalysts. An exhaust system containing an aged closed-coupled Ce free warm up catalyst and an 850°C aged underfloor “Ba+alkali metals” NOx adsorber catalyst is capable of achieving Euro IV emission standard and offering better fuel economy. However, high mobility and high affinity of alkali metals with SiO2 lead to migration of alkali metals away from the NOx adsorber washcoat and accumulation on cordierite substrates after aging. Mechanical properties of a “Ba+alkali metals” NOx adsorber catalyst are compared with those of a 3-way catalyst after aging. In summary, “Ba+alkali metals” NOx adsorber catalysts with improved mechanical durability are most suitable for broader future applications in Europe.
Recommended Content
Technical Paper | Strategies for Gasoline Particulate Emission Control - A “Foresight Vehicle” Project |
Technical Paper | Hexagonal Cell Ceramic Substrates for Lower Emission and Backpressure |
Topic
Citation
Dou, D. and Balland, J., "Impact of Alkali Metals on the Performance and Mechanical Properties of NOx Adsorber Catalysts," SAE Technical Paper 2002-01-0734, 2002, https://doi.org/10.4271/2002-01-0734.Also In
References
- Miyoshi 1.N. Matsumoto S. Katoh K. Tenaka T. Harada J. Takhashi N. Yokota K. Sugiura M. Kasahara K. “Development of New Concept Three-Way Catalyst for Automotive Lean-Burn Engines” SAE 950809 1995
- Brogan M.S. Brisley R.J. Walker A.P. Webster D.E. Boegner W. Fekete N.P. Krämer M. Krutzsch B. Voigtlander D. “Evaluation of NOx Storage Catalysts as an Effective System for NOx Removal from the Exhaust Gas of Lean Burn Gasoline Engines” SAE 952490 1995
- Brogan M.S. Brisley R.J. Moore J.S. Clark A.D. “Evaluation of NOx Adsorber Catalysts Systems to Reduce Emissions of Lean Running Gasoline Engines” SAE 962045 1996
- Takahashi N. Shinjoh H. Iijima T. Suzuki T. Yamazaki K. Yokota Koji Suzuki H. Miyoshi N. Matsumoto S. Tanizawa T. Tanaka T. “The New Concept 3-way Catalyst for Automotive Lean-burn Engine: NOx Storage and Reduction Catalysts” Catalysis Today 27 63 69 1996
- Strehlau W. Leyrer J. Lox E.S. Kreuzer T. Hori M. Hoffmann M. “New Developments in Lean NOx Catalysis for Gasoline Passenger Cars in Europe” SAE 962047 1996
- Hepburn J.S. Thanasiu E. Dobson D.A. Watkins W.L. “Experimental and Modeling Investigations of NOx Trap Performance” SAE 962051 1996
- Bailey O.H. Dou D. Denision G.W. “Regeneration Strategies for NOx Adsorber Catalysts” SAE 972845 1997
- Fekete N. Kemmler R. Voigtländer D. Krutzsch B. Zimmer E. Wenninger G. Strehlau W. van den Tillaart J.A.A Leyrer J. Lox E.S. Müller W. “Evaluation of NOx Storage Catalysts for Lean Burn Gasoline Fueled Passenger Cars” SAE 970746 1997
- Brogan M.S. Clark A.D. Brisley R.J. “Recent Progress in NOx Trap Technology” SAE 980933 1998
- Kisenyi J.M. Cumming B. Stark R. Marshall R.A Gibbons E.F. “Correlation between Dynaomometer- and Vehicle-Aged Catalysts for Automotive Lean-Burn Applications” SAE 980934 1998
- Dou D. Bailey O.H. “Investigation of NOx Adsorber Catalyst Deactivation” SAE Paper 982594 1998
- Dearth M. Hepburn J. S. Thanasiu E. McKenzie J. Horne G.S. “Sulfur Interaction with Lean NOx Traps: Laboratory and Engine Dynamometer Studies” SAE 982595 1998
- Ikeda Y. Sobue K. Tsuji S. Matsumoto S. “Development of NOx Storage-Reduction Three-way Catalyst for D4 Engines” SAE 1999-01-1279
- Goebel U. Hoehne J. Lox E.S. Mueller W. Okumura A. Strehlau W. Hori M. “Durability Aspects of NOx Storage Catalysts for Direct Injection Gasoline Vehicles” SAE 99FL-103 1999
- Erkfeldt S. Larsson M. Hedblom H. Skoglundh M. “Sulfur Poisoning and Regeneration of NOx Trap Catalyst for Direct Injected Gasoline Engines”
- Asanuma T. Takeshima S. Yamashita T. Tanaka T. Murai T. Iguchi S. “Influence of Sulfur Concentration in Gasoline on NOx Storage-Reduction Catalyst” SAE 1999-01-3501 1999
- Hodjati Sh. Semelle F. Moral N. Bert C. Rigaud M. “Impact of Sulfur on the NOx Trap Catalyst Activity-poisoning and Regeneration Behavior” SAE 2000-01-1874 2000
- Hachisuka I. Hirata H. Ikeda Y. Matsumoto S. “Deactivation Mechanism of NOx storage-Reduction Catalyst and Improvement of Its performance” SAE 2000-01-1196 2000
- Asik J.R. Meyer G.M. Dobson D. “Lean NOx Trap Desulfation Through Rapid Air Fuel Modulation” SAE 2000-01-1200 2000
- Bailey O.H. Dou D. Molinier M. “Sulfur Traps for NOx Adsorbers: Materials Development and Maintenance Strategies for Their Application” SAE 2000-01-1205 2000
- Ohno H. Takanohashi T. Takaoka N. Kuroda O. Iizuka H. “NOx Conversion Properties of a Mixed Oxide Type Lean NOx Catalyst” SAE 2000-01-1197 2000
- Balland J. Frugier J. Schreurs B. “Impact of NOx Adsorber Regeneration on Fuel Economy” Berlin Symposium 2000
- Glück K.H. Göbel U. Hahn H. Höhne J. Krebs R. Kreuzer T. Pott E. “Cleaning the Exhaust Gas of Volkswagen FSI Engines” MTZ Motortechnische Zeitshrift 61 6 2000
- 2000
- Cutler W.A. Day J.P. “Mechanical Durability of Cordierite-based NOx Adsorber/catalyst Systems for Lean Burn Gasoline Applications” SAE 1999-01-3500 1999
- Iwachido K. Tanada H. Wantanabe T. Yamada N. Nakayama O. Ando H. Hori M. Taniguchi S. Noda N. Abe F. “Development of the NOx Adsorber Catalyst for Use with High-Temperature Conditions” SAE 2001-01-1298 2001
- Ando H. “High-Temperature Lean NOx Catalyst and Catalyst Reaction Management” AutoTechnolgy 4 70 2001