한국자동차공학회논문집 (Transactions of the Korean Society of Automotive Engineers)

  • 제13권3호
  • /
  • Pages.123-130
  • /
  • 2005
  • /
  • 1225-6382(pISSN)
  • /
  • 2234-0149(eISSN)
한국자동차공학회 (The Korean Society of Automotive Engineers)
권호 표지

정상 및 비정상 온도변화에 따른 린번 천연가스 자동차용 촉매의 정화성능

Conversion Efficiency of Catalyst for Lean-bum Natural Gas Vehicles with Steady and Unsteady State Temperature Change

  • Cho Byung-Chul (Automobile Research Center, Chonnam National University) ;
  • Juhng Woo-Nam (Automobile Research Center, Chonnam National University) ;
  • Piao Fengai (Graduate School of Mechanical Engineering, Chonnam National University) ;
  • Lee Choon-Hee (Graduate School of Mechanical Engineering, Chonnam National University) ;
  • Lee Jang-Hee (Engine R&D Group) ;
  • Yun Jeong-Eui (Samcheok National University)
  • 발행 : 2005.05.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, we evaluated the CH4 and CO conversion efficiencies over the oxidation catalysts for natural gas vehicle with lean-burn system. On the fresh catalyst, the conversion efficiency was increased when the loading of precious metal was increased. On the aged catalyst, the conversion efficiency was decreased as increasing the excess air ratio. We could confirm the measuring conversion efficiency of the unsteady state with the FTIR and that of steady state with the GC The temperature increasing ratio of unsteady state is acceptable from 3$^{\circ}C$/min. to 15$^{\circ}C$/min. for the evaluation of catalyst conversion performance , which has within the 4$\%$ of the difference of conversion efficiency. We observed a physical behavior of the thermal aged catalyst's surface using TEM and BET device. It was found that the precious metal was grown to the micro-scopic size by thermal aging process.

키워드

참고문헌

  1. B. Dhaliwal and D. Checkel, 'Tailpipe Emissions Comparison Between Propane and Natural Gas Forklifts,' SAE 2000-01-1865, 2000
  2. A. Ayala, M. E.Gebel and R. A. Okamoto, 'Oxidation Catalyst Effect on CNG Transit Bus Emissions,' SAE 2003-01-1990, 2003
  3. G. S. Son, 'A Study of Aftertreatment System for Ultra Low Emission Vehicles,' Ph D. Thesis at Ajou University, p.181, 1997
  4. B. C Choi and S. S Y oon, 'Conversion and Aging Characteristics of Oxidation Catalyst for Natural Gas Vehicle with Lean-burn System,' Transactions of KSAE, Vol.11 , No.2, pp.134-139, 2003
  5. R. L. McCromick, A.W. Newlin and D. Mowery, 'Rapid Deactivation of Lean-Burn Natural Gas Engine Exhaust Oxidation Catalysts,' SAE 961976,1996
  6. B. C Choi and P. S Jeong, 'Improvement of Lambda-window Range of the Three-way Catalyst for Natural Gas Vehicle,' Transactions of KSAE, Vol.8, No.1, pp.92-100, 2000
  7. B. Andersson and N. Cruise, 'Methane and Nitric Oxide Conversion Over a Catalyst Dedicated for Natural Gas Vehicles,' SAE 2000-01-2928, 2000
  8. B. C. Choi, G. S. Son, E. K. Kim and K. Y. Lee, 'Effective Parameters on the Catalytic Reaction of NGV Catalytic Converter,' SAE 960239, 1996
  9. W. B. Williamson, R. P. Richmond, J. G. Nunan, A. Bortun and H. J. Robota, 'Palladium and Platinum/Rhodium Dual-Catalyst NLEV and Tier II a Close-Coupled Emission Solution,' SAE 2001-01-0923, 2001
  10. F. B Noronha, M. A. S. Baldanza and M. Schmal 'CO and NO Adsorption on Alumina-Pd-Mo Catalysts: Effect of the Precursor Salts,' J. of Cat. 188, pp.270-280, 1999 https://doi.org/10.1006/jcat.1999.2644
  11. R. Burch, P. K. Loader, F. J. Urbano, 'Some aspects of Hydrocarbon Activation on Platinum Group Metal Combustion Catalysts,' Cat. Today 27, pp.243-248, 1996 https://doi.org/10.1016/0920-5861(95)00194-8
  12. P. Pantu, G. R. Gavalas, 'Methane Partial Oxidation on Pt/$CeO_2$ and Pt/$Al_2O_3$ Catalysts,' App. Cat. A: General 223, pp.253-260, 2002 https://doi.org/10.1016/S0926-860X(01)00761-X