This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Rapid Aging of Diesel Lean NOx Traps by High-Temperature Thermal Cycling
Technical Paper
2007-01-0470
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In the present study, a bench-flow reactor is used to perform lean/rich thermal cycling on model “Ba+K” LNT catalysts at temperatures of 700, 800, 900 and 1000°C using simulated diesel exhaust gases. Deterioration of NOx performance is measured and the deactivation mechanisms of thermally-aged “Ba+K” LNTs are identified using characterization techniques such as TEM, XRD and EPMA. Results indicate that the deterioration is minimal at 700 and 800°C, however, at aging temperatures exceeding 800°C the severity of thermal aging depends on aging temperature as well as number of aging cycles. From the characterization studies four deactivation mechanisms have been identified: the loss of dispersion of PGM, NOx storage components and oxygen storage components due to sintering, the reactions between the NOx storage components and other washcoat components to form less efficient NOx storage media, the transformation of gamma-alumina to other forms, and the migration of potassium from the washcoat to the cordierite substrate.
Recommended Content
Authors
Citation
Nguyen, K., Kim, H., Bunting, B., Toops, T. et al., "Rapid Aging of Diesel Lean NOx Traps by High-Temperature Thermal Cycling," SAE Technical Paper 2007-01-0470, 2007, https://doi.org/10.4271/2007-01-0470.Also In
References
- Iwachido, K. Tanada, H. Watanabe, T. Yamada, N. Nakayama, O. Ando, H. Hori, M Taniguchi, S. Noda, N. Abe, F. “Development of the NO x Adsorber Catalyst for Use with High-Temperature Condition,” SAE 2001-01-1298 2001
- Dou, D. Balland, J. “Impact of Alkali Metals on the Performance and and Mechanical Properties of NO x Adsorber Catalysts.” SAE 2002-01-0734 2002
- Iizuka, H. Kaneeda, M. Higashiyama, K. Kuroda, O. Shinotsuka, N. Watanabe, H. “Improvement of Heat Resistance for Lean NO x Catalyst,” SAE 2004-01-1495 2004
- Mulla, S.S. Chen, N. Cumaranatunge, L. Delgass, W.N. Epling, W.S. Ribeiro, F.H. “Effect of potassium and water vapor on the catalytic reaction of nitric oxide and dioxygen over platinum,” Catalysis Today 114 57 63 2006
- Dou D. Bailey O.H. “Investigation of NO x Absorber Catalyst Deactivation,” SAE Paper 982594 1998
- Poulston, S. Rajaram, R.R. “Regeneration of NO x trap catalysts,” Catalysis Today 2003 81 603 610
- Cheng, Y. Cavataio, J.V. Belanger, W.D. Hoard, J.W. Hammerle, R.H. “Factors Affecting Diesel LNT Durability in Lab Reactor Studies,” SAE 2004-01-0156
- Erkfeldt S. Larsson M. Hedblom H. Skoglundh M. “Sulfur Poisoning and Generation of NO x Trap Catalysts for Direct Injected Gasoline Engines,” SAE 1999-01-3504 1999
- Geckler S. Tomazic D. Scholz V. Whalen M. V. NcKinnon D. Orban J. Gorse R. A. Bailey O. Hoelzer J.C. “Development of a Desulfurization Stratrgy for a NO x Absorber Catalyst System,” SAE 2001-01-0510 2001
- Asanuma T. Takeshima S. Yamashita T. Tanaka T. Murai T. Iguchi S. “Influence of Sulfur Concentration in Gasoline on NO x Storage-Reduction Catalyst,” SAE 1999-01-3501 1999
- Hodjati S. Semelle F. Moral N. Bert C. Rigaud M. “Impact of Sulfur on the NO x Trap Catalyst Activity--Poisoning and Regeneration Behavior,” SAE 2000-01-1874
- Asik J.R. Meyer G.M. Dobson D. “Lean NO x Trap Desulfation Through Rapid Air-Fuel Modulation,” SAE 2000-01-1200 2000
- Fekete N. et al. “Evaluation of NO x Storage Catalysts for Lean Burn Gasoline Fueled Passenger Cars,” SAE 970746 1997
- Goebel U. Lox E.S. Mueller W. Okumora A. Strehlau W. Hori M. “Durability Aspects of NO x Storage Catalysts for Direct Injection Gasoline Vehicles,” SAE 1999-01-1285 1999
- Hachisuka I. Hirata H. Ikeda Y. Matsumoto S. “Deactivation Mechanism of NO x Storage-Reduction Catalyst and Improvement of Its Performance,” SAE 2000-01-1196
- Kaneeda, M. Iizuka, H. Higashiyama, K. Kuroda, O. Hiratsuka, T. Shinotsuka, N. Ohno, H. Takanohashi, T. Satoh, N. “Improvement of Thermal Resistance for Lean NO x Catalyst,” SAE 2003-01-1161
- Eberhardt M, Riedel R. Gobel U. Theis J. Lox E.S. “Fundamental Investigations of Thermal Aging Phenomena of Model NO x Storage Systems,” Topics in Catalysis 30 31 135 142 2004
- Theis, J.R. Ura, J.A. Goralski, C.T. Jr Caine, J. Davies, M. Kay, D. Todd, A. Dinsdale, S. “The Effects of Aging Temperature and PGM Loading on the NO x Storage Capacity of a Lean NO x Trap,” SAE 2005-01-1117 2005
- Elbouazzaoui S. Courtois X. Marecot P. Duprez D. “Characterization by TPR, XRD and NO x Storage Capacity Measurements of the Ageing by Thermal Treatment and SO 2 Poisoning of a Pt/Ba/Al NO x - Trap Model Catalyst,” Topics in Catalysis 30 31 493 496 2005
- Toops T.J. Bunting B.G. Nguyen K. Gopinath A. “Effect of Engine-Based Thermal Aging on Surface Morphology and Performance of Lean NO x Traps” Catalysis Today
- Zhou G. Luo T. Gorte R.J. “An Investigation of NO x Storage on Pt-BaO-Al 2 O 3 ,” Applied Catalysis B: Environmental 64 88 95 2006
- Casapu M. Grunwaldt J.D. Maciejewski M. Wittrock M. Gobel U. Baiker A. “Formation and Stability of Barium Aluminate and Cerate in NO x Storage Reduction Catalysts,” Applied Catalysis B: Environmental 63 232 242 2006
- Szailer T. Kwak J. H. Kim D.H. Szanyi J. Wang C. Peden C.H.F. “Effects of Ba Loading and Calcination Temperature on BaAl 2 O 4 Formation for BaO/Al 2 O 3 NO x Storage and Reduction Catalysts,” Catalysis Today 114 86 93 2006
- Jim Do Heui Chin Ya-Huei Kwak Ja Hun Szanyi Janos Peden Charles H.F. “Changes in Ba Phases in BaO/Al 2 O 3 Upon Thermal Aging and H 2 O Treatment,” Catalysis Letters 105 259 268 2005