한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제14권3호
  • /
  • Pages.125-132
  • /
  • 2006
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  • 1225-6382(pISSN)
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  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

모노리스 $NH_3-SCR$ 반응기 내에서의 $NH_3$ 흡.탈착 특성에 대한 연구

A Study of $NH_3$ Adsorption/Desorption Characteristics in the Monolithic $NH_3-SCR$ Reactor

  • 왕태중 (한국과학기술원 기계공학과) ;
  • 백승욱 (한국과학기술원 기계공학과) ;
  • 정명근 (오덱(주) 촉매기술팀) ;
  • 여권구 (현대자동자(주) 배기연구팀)
  • 발행 : 2006.05.01
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초록

Transient kinetics of $NH_3$ adsorption/desorption and of SCR(selective catalytic reduction) of NO with $NH_3$ were studied over vanadium based catalysts, such as $V_2O_5/TiO_2$ and $V_2O_5-WO_3/TiO_2$. In the present catalytic reaction process, NO adsorption is neglected while $NH_3$ is strongly chemisorbed on the catalytic surface. Accordingly, it is ruled out the possibility of a reaction between strongly adsorbed $NH_3$ and NO species in line with the hypothesis of an Eley-Rideal mechanism. The present kinetic model assumes; (1) non-activated $NH_3$ adsorption, (2) Temkin-type $NH_3$ coverage dependence of the desorption energy, (3) non-linear dependence of the SCR reaction rate on the $NH_3$ surface coverage. Thus, the surface heterogeneity for adsorption/desorption of $NH_3$ is taken into account in this model. The present study extends the pure chemical kinetic model based on a powdered-phase catalytic system to the chemico-physical one applicable to a realistic monolith reactor.

키워드

참고문헌

  1. Dieselnet Technology Guide, Selective Catalytic Reduction, http://www. Dieselnet.com, 2002
  2. Dieselnet Technology Guide, Catalyst Fundamentals, http://www. Dieselnet.com, 2000
  3. R. Wanker, H. Granter, G. Bachler, G. Rabenstein, A. Ennemoser, R. Tatschl and M. Bollig, 'New Physical and Chemical Models for the CFD Simulation of Exhaust Gas Lines: A Generic Approach,' SAE 2002-01-0066, 2002
  4. R. M. Heck, J. M. Chen and B. K. Speronello, 'Operating Characteristics and Commercial Operating Experience with High Temperature SCR NOX Catalyst,' Env. Prog., Vol.13, pp.221-225, 1994 https://doi.org/10.1002/ep.670130410
  5. T. Z. Srnak, J. A. Dumesic, B. S. Clausen, E. Törnqvist and N. Y. Topsoe, 'Temperature- Programmed Desorption/Reaction and in Situ Spectroscopic Studies of Vanadia/Titania for Catalytic Reduction of Nitric Oxide,' J. Catal., Vol.135, pp.246-262, 1992 https://doi.org/10.1016/0021-9517(92)90283-N
  6. N. Y. Topsoe, J. A. Dumesic and H. Topsoe, 'Vanadia-Titania Catalysts for Selective Catalytic Reduction of Nitric Oxide by Ammonia:II. Studies of Active Sites and Formulation of Catalytic Cycles,' J. Catal., Vol.151, pp.241-252, 1995 https://doi.org/10.1006/jcat.1995.1025
  7. M. Kaviany, Principles of Heat Transfer in Porous Media, 2nd Edition, Springer-Verlag New York, 1995
  8. L. Lietti, I. Nova, S. Camurri, E. Tronconi and P. Forzatti, 'Dynamics of the SCR-DeNOX Reaction by the Transient-Response Method,' AIChE J., Vol.43, pp.2559-2570, 1997 https://doi.org/10.1002/aic.690431017
  9. L. Lietti, P. Forzatti, G. Ramis, G. Busca and F. Bregani, 'Potassium Doping of Vanadia/ Titania de-NOXing Catalysts: Surface Characterisation and Reactivity Study,' Appl. Catal. B: Env., Vol.3, pp.13-35, 1993 https://doi.org/10.1016/0926-3373(93)80065-L
  10. L. Lietti and P. Forzatti, 'Temperature Programmed Desorption/Reaction of Ammonia over $V_2O_5/TiO_2$ De-NOXing Catalysts,' J. Catal., Vol.147, pp.241-249, 1994 https://doi.org/10.1006/jcat.1994.1135
  11. N. Y. Topsoe, 'Characterization of the Nature of Surface Sites on Vanadia-Titania Catalysts by FTIR,' J. Catal., Vol.128, pp.499-511, 1991 https://doi.org/10.1016/0021-9517(91)90307-P
  12. G. Ramis, G. Busca, C. Cristiani, L. Lietti, P. Forzatti and F. Bregani, 'Characterization of Tungsta-Titania Catalysts,' Langmuir, Vol.8, pp.1744-1749, 1992 https://doi.org/10.1021/la00043a010
  13. M. Y. Kim, 'Performance Prediction of SCRDeNOx System for Reduction of Diesel Engine NOx Emission,' Transactions of KSAE, Vol.11, pp.71- 76, 2003
  14. J. C. Tannehill, D. A. Anderson and R. H. Pletcher, Computational Fluid Mechanics and Heat Transfer, 2nd Edition, Taylor and Francis, Philadelphia, 1997