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

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

DOI QR Code

Strength and conversion characteristics of DeNOx catalysts with the addition of dispersion agent

분산제 첨가에 따른 탈질촉매의 강도세기 및 전환특성

  • Lee, Hyun Hee (Department of Environmental Energy Systems Engineering, Kyonggi University) ;
  • Park, Kwang Hee (R&D Center, Alantum Corp.) ;
  • Cha, Wang Seog (Department of Environmental Engineering, Kunsan National University)
  • 이현희 (경기대학교 환경에너지시스템공학과) ;
  • 박광희 ((주)알란텀연구센터) ;
  • 차왕석 (군산대학교 환경공학과)
  • Received : 2013.08.29
  • Accepted : 2013.12.05
  • Published : 2013.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

Various modified SCR catalysts were prepared and tested to improve the strength of catalysts for use under severe conditions. The SCR catalysts were modified with a binder and dispersion agent, and tested at the fixed bed reactor. FT-IR and $H_2$-TPR were used to analyze the degree of hydrogen use and ammonia adsorption by the modified catalysts. In the case of the SCR catalysts coated with 2.3g of the binder, 4.7g of ethanol, and 0.1g of dispersion agent, the strength of catalyst was increased by approximately 12%. On the other hand, despite the enhancement of strength, the activities of the SCR catalysts were decreased by 2-10%. When the mixed solution composed of binder, dispersion agent and $SiO_2$ solution was precipitated on the catalyst, the $NO_x$ conversion of the catalyst was decreased slightly. The Bronsted acid site and Lewis acid site worked as the activators for the SCR reaction, and were decreased by $SiO_2$.

가혹한 조건에서도 사용할 수 있도록 촉매의 강도세기를 증진시키기 위해 다양하게 촉매를 개질하였다. SCR촉매는 바인더와 분산제를 이용하여 개질하였으며 고정층반응기에서 실험하였다. 개질된 촉매에 대한 수소이용정도, 암모니아 흡착정도를 FT-IR과 $H_2$-TPR을 이용하여 측정하였다. 2.3g의 바인더, 4.7g의 에탄올 그리고 0.1g의 분산제가 SCR촉매에 적절하게 침지된 경우 촉매 강도세기에 있어 약 12%의 증가가 있었다. 그러나 촉매의 강도세기가 증가하는 것에 반해 SCR촉매의 효율은 2~10% 감소하는 경향을 보였다. 그리고 바인더, 분산제, $SiO_2$용액으로 구성된 혼합용액을 촉매에 침지시킬 경우, 촉매의 질소산화물 전환율은 다소 감소하였다. 이는 SCR 반응에 있어 활성점 역할을 하는 Bronsted 산점과 Lewis 산점이 $SiO_2$에 의해 감소하기 때문인 것으로 판단된다.

Keywords

References

  1. Wenqing Xu, Yunbo Yu, Changbin Zhang, and Hong He, "Selective catalytic reduction of NO by $NH_3$ over a Ce/$TiO_2$ catalyst", Catal. Commum., 9(6), 1453-1457, 2008. DOI: http://dx.doi.org/10.1016/j.catcom.2007.12.012
  2. Hanna Sjovall, Louise Olsson, Erik Fridell, and Richard J. Blint, "Selective catalytic reduction of $NO_x$ with $NH_3$ over Cu-ZSM-5-The effect of changing the gas composition", Appl. Catal. B: Environ., 64(3-4), 180-188, 2006. DOI: http://dx.doi.org/10.1016/j.apcatb.2005.12.003
  3. Johnson T. V., "Review of diesel emissions and control", Int. J. Engine Res., 10(5), 275-285, 2009. DOI: http://dx.doi.org/10.1243/14680874JER04009
  4. Laura Casagrande, Luca Lietti, Isabella Nova, Pio Forzatti, and Alfons Baiker, "SCR of NO by $NH_3$ over $TiO_2$-supported $V_2O_5-MoO_3$ catalysts: reactivity and redox behavior", Appl. Catal. B: Environ., 22(1), 63-771, 1999. DOI: http://dx.doi.org/10.1016/S0926-3373(99)00035-1
  5. Park, K.H. and W.S. Cha, "$NO_x$ removal of $NH_3$-SCR catalysts with operating conditions", Journal of the Korea Academia-Industrial cooperation Society., 13(11), 5610-5614, 2012. https://doi.org/10.5762/KAIS.2012.13.11.5610
  6. Luca Lietti, "Reactivity of $V_2O_5-WO_3$/$TiO_2$ de-$NO_x$ catalysts by transient methods", Appl. Catal. B: Environ., 10(4), 281-297, 1996. DOI: http://dx.doi.org/10.1016/S0926-3373(97)80001-X
  7. Park, K.H., S.H. You, Y.O. Park, S.W. Kim, and W.S. Cha, "$NO_x$ removal of Mn based catalyst for the pretreatment condition and sulfur dioxide", Journal of the Korea Academia-Industrial cooperation Society, 13(4), 1923-1930, 2012. DOI: http://dx.doi.org/10.5762/KAIS.2012.13.4.1923
  8. Xiaolong Tang, and Jiming Hao, Wenguo Xu, Junhua Li, "Low temperature selective catalytic reduction of $NO_x$ with $NH_3$ over amorphous M$NO_x$ catalysts prepared by three methods", catal. commun., 8(3), 329-334, 2007. DOI: http://dx.doi.org/10.1016/j.catcom.2006.06.025
  9. Park, K.H. and 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.
  10. Sorrentino A., S. Rega, D. Sannino, A. Magliano, P. Ciambelli, and E. Santacesari, "Performances of $V_2O_5$-based catalysts obtained by grafting vanadyl tri-isopropoxide on $TiO_2$-$SiO_2$ in SCR", Appl. Catal. A: Gen., 209(1-2), 45-57, 2001. DOI: http://dx.doi.org/10.1016/S0926-860X(00)00742-0
  11. Jih-Mirn Jehng, Goutam Deo, Bert M. Weckhuysen, and Israel E. Wachs, "Effect of water vapor on the molecular structures of supported vanadium oxide catalysts at elevated temperatures", J. Mol. Catal. A., 110(1), 41-54, 1996. DOI: http://dx.doi.org/10.1016/1381-1169(96)00061-1
  12. Liang Chen, Junhua Li, and Maofa Ge, "Promotional Effect of Ce-doped $V_2O_5-WO_3$/$TiO_2$ with Low Vanadium Loadings for Selective Catalytic Reduction of $NO_x$ by $NH_3$", J. Phys. Chem. C, 133(50), 21177-21184, 2009. DOI: http://dx.doi.org/10.1021/jp907109e
  13. Sohn, J.R., J.G. Kim, T.D. Kwon, and E.H. Park, "Characterization of Titanium Sulfate Supported on Zirconia and Activity for Acid Catalysis", Langmuir. 18(5), 1666-1673, 2002. DOI: http://dx.doi.org/10.1021/la011304h