Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Effects for Coexistent Reductant to NOx Adsorption and Desorption of the NOx Storage Catalyst

공존 환원제가 NOx 흡장촉매의 NOx 흡$\cdot$ 탈착에 미치는 영향

  • Lee, Choon-Hee (Graduate School of Mechanical Engineering, Chonnam National University) ;
  • Choi, Byung-Chul (School of Mechanical System Engineering, Chonnam National University)
  • Published : 2005.09.01
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Abstract

The behavior of fox adsorption and desorption of the NOx storage catalyst supported on Ba additive were studied by the TPA/TPD experiments and reactivity tests. Applying the transient responses and NOx TPA/TPD test by CLD were effective methods to analyze the characteristics of the NOx storage catalyst. NOx variation of the NOx storage catalyst in the lean air/fuel conditions according to temperature was dominated by NOx adsorption and desorption rather than catalytic reduction. The presence of reductants in the lean mixture promoted the NOx desorption at the $500^{\circ}C$ higher temperature. The temperatures for maximum NOx conversion with CH4 and $C_3H_6$ as a rich spike reductant appear around $500^{\circ}C\;and\; 400^{\circ}C$ respectively.

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References

  1. J. Kaspar, P. Fornasier and N. Hickey, 'Automotive Catalytic Converter:Current Status and Some Perspectives,' Catalysis Today, Vol.77, pp.419-449, 2003 https://doi.org/10.1016/S0920-5861(02)00384-X
  2. N. Miyoshi, S. Matsumoto and K. Katoh, 'Development of New Concept Three-way Catalyst for Automotive Lean-burn Engines,' SAE 950809, 1995
  3. N. Takahashi, H. Shinjoh and T. Iijima, 'The New Concept 3-way Catalyst for Automotive Lean-burn Engine:NOx Storage and Reduction Catalyst,' Catalysis Today, Vol.27, pp.63-69, 1996 https://doi.org/10.1016/0920-5861(95)00173-5
  4. D. Dou and S. Miyaura, 'NOx-trap Catalyst Development for Mitsubishi 1.8 L GDI Applications,' SAE 2003-01-3078, 2003
  5. A. Amberntsson, M. Skoglundh and E. Fridell, 'Sulfur Deactivation of NOx Storage Catalyst: Influence of Exposure Conditions and Noble Metal,' J. of Catalysis, Vol.217, pp.253-263, 2003 https://doi.org/10.1016/S0021-9517(03)00027-7
  6. J. R. Theis, J. A. Ura and G. W. Graham, 'The Effects of Aging Temperature and Air-fuel Ratio on the NOx Storage Capacity of a Lean NOx Trap,' SAE 2004-01-1493, 2004
  7. S. Kojima and T. Jimbo, 'Analysis and Simplification of Thermal Endurance Tests of NOx Storage-reduction Catalysts,' SAE2004-01-1496, 2004
  8. C. Sedlmair, K. Seshan and A. Jentys, 'Elementary Steps of NOx Adsorption and Surface Reaction on a Commercial Storage-reduction Catalyst,' J. of Catalysis, Vol.214, pp.308-316, 2003 https://doi.org/10.1016/S0021-9517(02)00085-4
  9. B. C. Choi, 'Technologies for Emission After-treatment,' Baro Press Co., pp.351-352, 2001
  10. C. H. Lee, B. C. Choi and W. N. Juhng, 'Comparison of NOx Reduction Characteristics of NOx Storage Catalyst with TWC for Leanburn Natural Gas Vehicles,' Transactions of KSAE, Vol.12, No.5, pp.79-84, 2004
  11. C. H. Lee, B. C. Choi, J. W. Jeong and S. S. Yun, 'Evaluation of de-NOx Catalyst Convertsion Efficiency for Lean-burn Natural Gas engine by Unsteady State Model Gas Reaction,' KSPSE 2002 Autumn Conference Proceedings, pp.166-173, 2002
  12. E. Fridell, H. Persson and B. Westerberg, 'The Mechanism for NOx Storage,' Catalysis Letters, Vol.66, pp.71-74, 2000 https://doi.org/10.1023/A:1019074901578
  13. E. Fridell, H. Persson, B. Westerberg, S. Johansson and G. Smedler, 'NOx Storage in Barium-containing Catalysts,' J. of Catalysis, Vol.183, pp.196-209, 1999 https://doi.org/10.1006/jcat.1999.2415