DOI QR코드

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제올라이트 종류 및 이온교환 물질에 따른 NH3-SCR 촉매 반응 특성

The Effects of Zeolite Structure and Ion-exchange Material on NH3-SCR Reaction

  • 황인혜 (한국기계연구원 그린동력연구실) ;
  • 이준호 (한국기계연구원 그린동력연구실) ;
  • 김홍석 (한국기계연구원 그린동력연구실) ;
  • 정용일 (한국기계연구원 그린동력연구실)
  • Hwang, Inhye (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Lee, Junho (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Kim, Hongsuk (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials) ;
  • Jeong, Youngil (Environmental System Research Division, Engine Research Team, Korea Institute of Machinery & Materials)
  • 투고 : 2013.05.10
  • 심사 : 2013.07.02
  • 발행 : 2014.01.01

초록

$NH_3$-SCR has high NOx removal efficiency approximately 80~90%. Recently, the copper or iron ion-exchanged zeolite catalysts are widely used as automobile SCR catalysts. In this paper, the effect of the space velocity, temperature of reaction and $NO_2$ addition on the $NH_3$-SCR reaction were studied using various zeolite SCR catalysts. The test was conducted with small sized fresh catalysts in a laboratory fixed-bed flow reactor system using simulated gases. It is found that the activity of the BEA is better than MFI. It seems that three-dimensional framework and a wide pore entrance of BEA enhances the SCR activity. It is also found that low temperature activity of Cu-zeolites was better than Fe-zeolites. Once $NO_2$ was added, the NOx conversion activity of the Cu-zeolite was slightly enhanced, whereas remarkable improvement was achieved by Fe-zeolite.

키워드

참고문헌

  1. G. Qi, R. T. Yang and F. Rinaldi, "Selective Catalytic Reduction of Nitric Oxide with Hydrogen over Pd-based Catalysts," J. Catal., Vol.237, Issue 2, pp.381-392, 2006. https://doi.org/10.1016/j.jcat.2005.11.025
  2. K. N. Kim and S. W. Cho, "The Emission Development for Lean NOx Trap System to Meet Tier2Bin5," SAE 2010-01-0566, 2010.
  3. BASF, Urea Solution 32.5% AdBlue, Technical Leaflet, BASFAG, 2003.
  4. P. S. Metkar, M. P. Harold and V. Balakotaiah, "Selective Catalytic Reduction of NOx on Combined Fe- and Cu-zeolite Monolithic Catalysts: Sequential and Dual Layer Configurations," Appl. Catal. B, Vol.111, pp.67-80, 2012.
  5. M. Colombo, I. Nova and E. Tronconi, "A Comparative Study of the NH3-SCR Reactions over a Cu-zeolite and a Fe-zeolite Catalyst," Catalysis Today, Vol.151, No.3-4, pp.223-230, 2010. https://doi.org/10.1016/j.cattod.2010.01.010
  6. J. R. Theis, "SCR Catalyst Systems Optimized for Lightoff and Steady-state Preformance," SAE 2009-01-0901, 2009.
  7. J. Girard, G. Cavataio, R. Snow and C. Lambert, "Combined Fe-Cu SCR Systems with Optimized Ammonia to NOx Ratio for Diesel NOx Control," SAE 2008-01-1185, 2008.
  8. C. Busco, A. Barbaglia, M. Broyer, V. Bolis, G. M. Foddanu and P. Ugliengo, "Characterisation of Lewis and Brønsted Acidic Sites in H-MFI and H-BEA Zeolites: A Thermodynamic and Ab Initio Study," Thermochimica Acta, Vol.418, No.1-2, pp.3-9, 2004. https://doi.org/10.1016/j.tca.2003.11.050
  9. C. Y. Lee and B. H. Ha, "Reduction Behavior of Copper Oxide in Copper/Mordenites," Stud. in Surf. Sci. & Catal., Elsevier Science, Vol.84, pp.1563-1570, 1994. https://doi.org/10.1016/S0167-2991(08)63704-0
  10. L. Gang, J. van Grondelle, B. G. Anderson and R. A. van Santen, "Selective Low Temperature $NH_3$ Oxidation to $N_2$ on Copper-based Catalysts," J. Catal., Vol.186, No.1, pp.100-109, 1999. https://doi.org/10.1006/jcat.1999.2524
  11. C. Y. Lee, K. H. Han and B. H. Ha, "Characteristics Combustion/ Decomposition Activities of CuO/mordenite," Microporous Materials, Vol.11, No.3-4, pp.227-235, 1997. https://doi.org/10.1016/S0927-6513(97)00052-7
  12. H. Y. Chen, X. Wang and Wolfgang M. H. Sachtlerm, "Reduction of NOx over Various Fe/zeolite Catalysts," Appl. Catal. A, Vol.194, pp.159-168, 2000.
  13. F. E. Celik, T. J. Kim and A. T. Bell, "Effect of Zeolite Framework Type and Si/Al Ratio on Dimethoxymethane Carbonylation," J. Catal., Vol.270, No.1, pp.185-195, 2010. https://doi.org/10.1016/j.jcat.2009.12.021
  14. G. Cavataio, J. Girard, J. E. Patterson, C. Montreuil, Y. Cheng and C. K. Lambert, "Laboratory Testing of Urea-SCR Formulations to Meet Tier 2 Bin 5 Emissions," SAE 2007-01-1575, 2007.
  15. J. R. Regalbuto, T. Zheng and J. T. Miller, "The Bifunctional Reaction Pathway and Dual Kinetic Regimes in NOx SCR by Methane over Cobalt Mordenite Catalysts," Catalysis Today, Vol.54, No.4, pp.495-505, 1999. https://doi.org/10.1016/S0920-5861(99)00212-6