Effect of SOx on HC-SCR Kinetics over Ag/Al2O3 Catalyst

SOx 함유 HC-SCR에서 산처리 Ag/Al2O3 촉매의 반응 특성

  • 이주헌 ((주)코켓 환경사업팀) ;
  • 박정환 (순천향대학교 나노화공과) ;
  • 김성수 (한국에너지연구소 폐자원 에너지 연구센터) ;
  • 유승준 (서남대학교 환경.화공학부) ;
  • 김진걸 (순천향대학교 나노화공과)
  • Received : 2011.07.05
  • Accepted : 2011.10.21
  • Published : 2011.10.30


Ethanol was used as reducing agent to remove $NO_x$ exhaust from the stationary source. Pre-treatment with sulfuric acid over $Ag/Al_2O_3$ catalyst was dedicated to overcome the $SO_2$ poisoning effect. The $NO_x$ reduction experiment was performed under the simulated condition of power plant The increased surface area with higher CPSI devoted to increase de-$NO_x$ yield. De-$NO_x$ yield of the $NO_x$ exhaust containing 20 ppm of $SO_2$ increased after acid treatment with 0.7% $H_2SO_4$ over 4.0% $Ag/Al_2O_3$, where the increased dispersion of Ag found from the results of XRD and XPS was the dominant factor for the increased de-$NO_x$ yield. However, the reason for the decreased de-$NO_x$ yield with the acid treatment of higher concentration (1.0% and 2.0%) of $H_2SO_4$ was found to be due to the formation of $Ag_2SO_4$ crystallites found from XRD result. Acid-treated $Ag/Al_2O_3$ catalyst showed maximum de-$NO_x$ yield at higher temperature than non-treated $Ag/Al_2O_3$ catalyst did.


  1. A. Keshavaia. X. She, and F. Stephanopoulos. "Selective catalytic reduction of NO with methane over Ag-alumina catalysts", Appl. Catal. B, Vol. 27, 2000, pp. L1-L9
  2. T. Miyadera, "Alumina-supported silver catalysts for the selective reduction of nitric oxide with propene and oxygen-containing organic compounds", Appl. Catal. B, Vol. 2, 1993, pp. 199-205
  3. F. C. Meunier. J. P. Breen, V. Zuzaniuk, M. Olsson, and J. R. H. Ross, "Mechanistic Aspects of the Selective Reduction of $NO_{x}$ by Propene over Alumina and Silver Alumina Catalysts", J. Catal., Vol. 187, 1999, pp. 493-505.
  4. J. G. Kim, M. J. Lee, H. M. Lee, J. Y. Jeon, S. .S. Kim and S. J. Yoo, "Study of efficiency of hydrogen rich biodiesel as reductant for HC-SCR over $Al_{2}O_{3}$ supported Ag Catalyst", Trans. Korean Hydrogen Energy Soc., Vol. 20, No. 3, 2009, pp. 232-237.
  5. K. Masuda, T. Tsujimura, K. Shinado, and T. Kato. "Silver-promoted catalyst for removal of nitrogen oxides from emission of diesel engines", Appl. Catal. B, Vol. 9, 1996, pp. 33-40.
  6. H. H. Lee and J. G. Kim, "Kinetics of hydrogen rich ethanol as reductant for HC-SCR over $Al_{2}O_{3}$ supported Ag Catalyst", Trans. Korean Hydrogen. Energy Soc., Vol. 21, No. 6, 2010, pp. 519-525.
  7. K. Shimizu, A. Satsuma, and T. Hattori, "Catalytic performance of Ag/$Al_{2}O_{3}$ catalyst for the selective catalytic reduction of NO by higher hydrocarbons", Appl. Catal. B, Vol. 25, 2000, pp. 239-247.
  8. Iwamoto, M., Yajiro, H., Shundo, S., and Mizuno, N., "Influence of Sulur Dioxide on Catalytic Removal of Nitric Oxide over Copper Ion-Exchanged ZSM-5 Zeolite", Appl. Catal., Vol. 69, L15, 1991, pp. L15-L19.
  9. R. Burch, and P. J. Millington, "Selective reduction of nitrogen oxides by hydrocarbons under lean-burn conditions using supported platinum group metal catalysts", Catal. Today, Vol. 26, 1995, pp. 185-206.
  10. T. Furusawa et al., "Selective reduction of NO to $N_{2}$ in the presence of oxygen over supported silver catalysts", Applied Catalysis B: Env., Vol. 37, 2002, pp. 205-216.
  11. A. Keshavaraja et al., "Selective catalytic reduction of NO with methane over Ag-alumina catalysts,' Applid Catalysis B: Env., Vol. 27, 2000, pp. L1-L9.
  12. S. Satokawa et al., "Influence of low concentration of $SO_{2}$ for selective reduction of NO by $C_{3}H_{8}$ in lean-exhaust conditions on the activity of Ag/$Al_{2}O_{3}$ catalyst", Applied Catalysis B: Env., 34, 2001, pp. 299-306.
  13. T.N. Angelidis, and N. Kruse, "Promotional effect of $SO_{2}$ on the selective catalytic reduction of NOx with propane/propene over Ag/$\gamma-Al_{2}O_{3}$", Applied Catalysis B: Env., Vol. 34, 2001, pp. 201-212.
  14. F.C. Meunier, and J. R. H. Ross. "A review of the selective reduction of $NO_{x}$ with hydrocarbons under lean-burn conditions with non-zeolitic oxide and platinum group metal catalysts", Appl, Catal. B, Vol. 39, 2002, pp. 283-303.
  15. H. W. Jen., "Study of nitric oxide reduction over silver/alumina catalysts under lean conditions: Effects of reaction conditions and support", Catal. Today, Vol. 42, 1998, pp. 37-44.