Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
권호 표지
DOI QR코드

DOI QR Code

Deactivation of V2O5/TiO2 catalytic system on the sulfuric oxides

V2O5/TiO2 촉매시스템의 황산화물에 대한 비활성화 특성

  • Jang, Hyun Tae (Department of Chemical Engineering, Hanseo University) ;
  • Cha, Wang Seog (Department of Environmental Engineering, Kunsan National University)
  • Received : 2015.10.15
  • Accepted : 2015.11.06
  • Published : 2015.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

Deactivation characteristics of $V_2O_5/TiO_2$ catalysts were studied for selective catalytic reduction(SCR) of NOx with ammonia in the presence of $SO_2$. Performance of catalyst was investigated for $deNO_x$ activity while changing temperature, $SO_2$ concentration. The activity of catalyst was decreased with the increase of $SO_2$ concentration and reaction time. Also, degree of activity drop was largely decreased with the increase of reaction temperature in the range of $250{\sim}300^{\circ}C$. Physicochemical properties of deactivated catalysts were characterized by BET, XRD, SEM, TPD analysis. According to the analysis results, deactivation phenomena occur due to the relatively high formation of ammonium sulfate salts, which created by unreacted ammonia and water in the presence of $SO_2$. It was revealed that ammonium sulfate cause the pore plogging of support and deposition of active matter.

암모니아를 환원제로 사용하는 선택적 촉매 환원법에서 $V_2O_5/TiO_2$ 촉매를 사용하여 황산화물에 대한 비활성화 특성을 연구하였다. 반응온도와 황산화물 농도를 변경시키면서 촉매의 활성변화를 측정하였다. 촉매의 활성은 황산화물의 농도와 반응시간이 증가할수록 감소하였다. 또한 황산화물에 대한 촉매의 활성감소 정도는 반응온도 $250{\sim}300^{\circ}C$의 범위에서 반응온도가 증가할수록 크게 감소하였다. BET, XRD, SEM, TPD분석을 통해 비활성화된 촉매의 물리화학적인 특성을 조사하였다. 분석결과, 비활성화현상은 황산화물이 존재하는 상태에서 미반응 암모니아, 수분 등이 반응하여 황산암모늄이 생성되기 때문이다. 황산암모늄은 촉매의 기공을 막으며 활성물질에 침적된다.

Keywords

References

  1. M. S. Maqbool, A. K. Pullur, H. P. Ha, "Novel sulfation effect on low-temperature activity enhancement of $CeO_2$-added $Sb-V_2O_5/TiO_2$ catalyst for $NH_3$-SCR", Appl. Catal. B: Environ, 152-153, 28-37, 2014. DOI: http://dx.doi.org/10.1016/j.apcatb.2014.01.017
  2. V. I. Parvulescu, P. Grange, B. Delmon, "Catalytic removal of NO", Catal. Today, 46, 216-233, 1998. DOI: http://dx.doi.org/10.1016/S0920-5861(98)00399-X
  3. X. D. Wu, Z. C. Si, G. Li, D. Weng, Z. R. Ma, "Effects of cerium and vanadium on the activity and selectivity of MnOx/$TiO_2$ catalyst for low-temperature $NH_3$-SCR", J. Rare Earth, 29, 64-68, 2011. DOI: http://dx.doi.org/10.1016/S1002-0721(10)60403-6
  4. G. S. Qi, R. T. Yang, "Low-temperature selective catalytic reduction of NO with $NH_3$ over iron and manganese oxides supported on titania", Appl. Catal. B: Environ, 44, 217-225, 2003. DOI: http://dx.doi.org/10.1016/S0926-3373(03)00100-0
  5. J. R. Strege, C. J. Zygarlicke, B. C. Folkedahl, D. P. McCollor, "SCR deactivation in a full-scale cofired utility boiler", Fuel, 87, 1341-1347, 2008. DOI: http://dx.doi.org/10.1016/j.fuel.2007.06.017
  6. W. Zhao, Q. Zhong, Y. Pan, R. Zhang, "Systematic effects of S-doping on the activity of $V_2O_5/TiO_2$ catalyst for low-temperature $NH_3$-SCR", Chemical Engineering Journal, 228, 815-823, 2013. DOI: http://dx.doi.org/10.1016/j.cej.2013.05.056
  7. W. Yu, X. Wu, Z. Si, D. Weng, "Influences of impregnation procedure on the SCR activity and alkali resistance of $V_2O_5-WO_3/TiO_2$ catalyst", Applied Surface Science, 283, 209-214, 2013. DOI: http://dx.doi.org/10.1016/j.apsusc.2013.06.083
  8. G. Yan, L. Tao, L. Tao, C. Kai, X. Hongming, "Performance of $V_2O_5-WO_3-MoO_3/TiO_2$ catalyst for selective catalytic reduction of NOx by $NH_3$", Chin. J. Chem. Eng., 21(1), 1-7, 2013. DOI: http://dx.doi.org/10.1016/S1004-9541(13)60434-6
  9. C. Xu, J. Liu, Z. Zhao, F. Yu, K. Cheng, Y. Wei, A. Duan, G. Jiang, "$NH_3$-SCR denitration catalyst performance over vanadium-titanium with the addition of Ce and Sb", Journal of Environmental Sciences, 31, 74-80, 2015. DOI: http://dx.doi.org/10.1016/j.jes.2014.09.040
  10. H. H. Lee, K. H. Park, W. S. Cha, "Characterization of low temperature selective catalytic reduction over Ti added Mn-Cu metal oxides", Appl. Chem. Eng., 24(6), 599-604, 2013. DOI: http://dx.doi.org/10.14478/ace.2013.1057
  11. X. Guo, C. Bartholomew, W. Hecker, L. L. Baxter, "Effects of sulfate species on $V_2O_5/TiO_2$ SCR catalysts in coal and biomass-fired systems", Appl. Catal. B: Environ, 92, 30-40, 2009. DOI: http://dx.doi.org/10.1016/j.apcatb.2009.07.025
  12. K. H. Park, S. H. You, Y. O. Park, S. W. Kim, W. S. Cha, "$NO_x$ conversion of Mn-Cu catalyst at the low temperature condition", Journal of the Korea Academia- Industrial Cooperation Society, 12(9), 4250-4256, 2011. DOI: http://dx.doi.org/10.5762/KAIS.2011.12.9.4250
  13. K. H. Park, W. S. Cha, "Effect of Vanadium Oxide Loading on SCR Activity and $SO_2$ Resistance over $TiO_2$-Supported $V_2O_5$ Commercial De-NOx Catalysts", Appl. Chem. Eng., 23(5), 485-489, 2012.