This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Key Characteristrics of the Sorption Process in Lean Nox Traps
Technical Paper
2003-01-3246
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
We study the NOx storage process in lean NOx traps using bench-flow experiments and simulated diesel exhaust. Given that formulation alone is an inadequate indicator of performance (due to the effects of manufacturing processes) a minimal set of experiments is always needed to compare the performance of LNTs. We define simple performance measures based on such a set of experiments that can be used to compare lean phase operations of various LNTs under various conditions concisely. Though the noble metal sites are essential for storage, the benefits of increasing noble metal loading start to wane beyond a certain limit. Our experiments suggest a possibility that a lean NOx reduction reaction may be occuring in LNTs. If this reaction is confirmed further in future experiments, its products need to be identified. The sorbent shifts the equilibrium between NO and NO2 towards NO. We propose an experimental protocol for generating the adsorption isotherm for NOx storage from equilibrium capacity measurements that can be used for verifying kinetic mechanisms and for developing simulation models.
Recommended Content
Authors
Citation
Chakravarthy, K., Daw, C., and Lenox, K., "Key Characteristrics of the Sorption Process in Lean Nox Traps," SAE Technical Paper 2003-01-3246, 2003, https://doi.org/10.4271/2003-01-3246.Also In
Emissions: Advanced Catalyst and Substrates, Measurement and Testing, Diesel Gaseous Emissions
Number: SP-1801; Published: 2003-10-31
Number: SP-1801; Published: 2003-10-31
References
- Kobayashi T. Yamada T. Kayano K. “Study of NOx trap reaction by thermodynamic calculation,” 1997 SAE paper No. 970745
- Ikeda Y. Sobue K. Tsuji S. Matsumoto S. “Development of NOx storage-reduction three-way catalyst for D-4 engines,” 1999 SAE paper No. 1999-01-1279
- Mahzoul H. Brilhac J. F. Gilot P. “Experimental and mechanistic study of NOx adsorption over NOx trap catalysts,” Applied Catalysis B: Environmental 20 47 55 1999
- Ketfi-Cherif A. von Wissel D. Beurthey S. Sorine M. “Modeling and control of a NOx trap catalyst,” 2000 SAE paper No. 2000-01-1199
- Hachisuka I. Hirata H. Ikeda Y. Matsumoto S. “Deactivation mechanism of NOx storage-reduction catalyst and improvement of its performance,” 2000 SAE paper No. 2000-01-1196
- Dou D. Balland J. “Impact of alkali metals on the performance and mechanical properties of NOx adsorber catalysts,” 2002 SAE paper No. 2002-01-0734
- Theis J. I. Gobel U. Kogel M. Kreuzer T. P. Lindner D. Lox E. Ruwisch L. “Phenomenological studies on the storage and regeneration process of NOx storage catalysts for gasoline lean burn applications,” 2002 SAE paper No. 2002-01-0057
- Miyoshi N. Matsumoto S. Katoh K. Tanaka T. Harada J. Takahashi N. Yokota K. Sugiura M. Kasahara K. “Development of new concept three-way catalyst for automotive burn engines,” 1995 SAE paper No. 950809
- Takahashi N. Shinjoh H. Iijima T. Suzuki T. Yamazaki K. Yokota K. Suzuki H. Miyoshi N. Matsomoto S. Tanizawa T. Tanaka T. Tateishi S. Kasahara K. “The new concept 3-way catalyst for automotive lean-burn engine: NOx storage and reduction catalyst,” Catalysis Today 27 63 69 1996
- Lietti L. Forzatti P. Nova I. Tronconi E. “ NOx storage reduction over Pt - Ba/γ - Al 2 O 3 catalyst,” Journal of Catalysis 204 175 191 2001
- Olsson L. Persson H. Fridell E. Skoglundh M. Andersson B. “A kinetic study of NO oxidation and NOx storage on Pt/Al 2 O 3 and Pt/BaO/Al 2 O 3 ,” Journal of Physical Chemistry B 105 6895 6906 2001
- Toops T. J. Smith D. B. Partridge W. P. Epling W. P. Parks J. E. “ NOx adsoption on Pt/K/γ - Al 2 O 3 and the quantitative effects of h2o and co2,” 3rd Joint Technical Meeting of the US Sections of the Combustion Institute Chicago, IL 2003
- Kantschewa M. Albano E. V. Ertl G. Knozinger H. “Infrared and x-ray photoelectron spectroscopy study of K 2 CO 3 / γ - Al 2 O 3 ,” Applied Catalysis 8 71 84 1983
- Iordan A. Zaki M. Kappenstein C. “Interfacial chemistry in the preparation of catalytic potassium-modified aluminas,” Journal of the Chemical Society Faraday transactions 89 14 2527 2536 1993
- Narula C. K. Nakouzi S. R. Wu R. Goralski C. T. Allard L. F. “Evaluation of sol-gel processed BaO.nAl 2 O 3 materials as NOx traps,” Environmental and Energy Engineering 47 744 753 2001
- Perry R. Green D. W. Perrys Chemical Engineers's Handbook seventh edition McGraw-Hill 1997
- Daw C. S. Chakravarthy V. K. Lenox K. E. “A simple model for lean NOx adsorber catalysts,” 3rd Joint Technical Meeting of the US Sections of the Combustion Institute Chicago, IL 2003
- Chuang S. S. C. Tan C. “Promotion of oxygen desorption to enhance direct NO decomposition over Tb - Pt/Al 2 O 3 catalyst,” Journal of Physical Chemistry B 101 15 3000 3004 1997
- Currier N. Partridge B. Lewis S. Parks J. “Spatially resolved dynamic measurement of gas phase composition inside operating catalysts - support of catalyst model development,” 2nd CLEERS workshop Dearborn, MI 2001 www.cleers.org
- Bailey O. H. Dou D. Denison G. W. “Regeneration strategies for NOx adsorber catalysts,” 1997 SAE paper No. 972845
- Olsson L. Fridell E. “The influence of Pt oxide formation and Pt dispersion on the reactions over NO 2 <=> NO + 1/2O 2 over Pt/Al 2 O 3 and Pt/BaO/Al 2 O 3 ,” Journal of Catalysis 210 340 353 2002