Abstract

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.

Keywords

• $Ag/Al_2O_3$;
• ethanol;
• Reduction;
• Acid-treated;
• $NO_x$ removal

• 에탄올;
• 환원;
• 산처리;
• 질소 산화물 제거;

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References

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 https://doi.org/10.1016/S0926-3373(00)00131-4
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 https://doi.org/10.1016/0926-3373(93)80048-I
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. https://doi.org/10.1006/jcat.1999.2622
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. https://doi.org/10.1016/S0926-3373(99)00135-6
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. https://doi.org/10.1016/S0166-9834(00)83286-8
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. https://doi.org/10.1016/0920-5861(95)00136-4
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. https://doi.org/10.1016/S0926-3373(01)00337-X
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. https://doi.org/10.1016/S0926-3373(00)00131-4
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. https://doi.org/10.1016/S0926-3373(01)00223-5
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. https://doi.org/10.1016/S0926-3373(01)00215-6
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. https://doi.org/10.1016/S0926-3373(02)00118-2
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. https://doi.org/10.1016/S0920-5861(98)00074-1