Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Colloidal Silica on Selective Catalytic Reduction (SCR) Catalyst Activity and Thermal Stability

Colloidal Silica의 특성이 SCR 촉매의 성능 및 열적 안정성에 미치는 영향

  • Cha, Jin-Sun (Material Technology Center, Korea Testing Laboratory) ;
  • Lee, Hyung Won (Wood Chemistry Division, Forest Products Department, National Institute of Forest Science) ;
  • Shin, Min-Chul (Material Technology Center, Korea Testing Laboratory) ;
  • Jeong, Bora (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology) ;
  • Kim, Hong-Dae (Green Materials & Processes Group, Ulsan Regional Division, Korea Institute of Industrial Technology)
  • 차진선 (한국산업기술시험원 재료기술센터) ;
  • 이형원 (국립산림과학원 목재화학연구과) ;
  • 신민철 (한국산업기술시험원 재료기술센터) ;
  • 정보라 (한국생산기술연구원 울산지역본부 친환경재료공정그룹) ;
  • 김홍대 (한국생산기술연구원 울산지역본부 친환경재료공정그룹)
  • Received : 2019.12.30
  • Accepted : 2020.01.06
  • Published : 2020.02.10
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the effect of characteristics of colloidal silica, which was used as an additive in the compression/coating catalyst process, on activities and thermal stabilities of the catalysts was investigated. The shape, size, specific surface area and porosity, and composition of four different types of colloidal silica materials were analyzed, and the NOx conversion of V2O5/TiO2 catalyst prepared by these colloidal silica were studied. Properties of the catalysts prepared by colloidal silica depend on the nature of the colloidal silica used, in particular the alkaline substances such as Na in the silica were evaluated to be directly effect on the deNOx conversion of the catalyst. In addition, higher silica contents in the colloidal silica were found to improve the deNOx activity and thermal stability of the catalyst.

본 연구에서는 압착·코팅방식 촉매 제조 공정에 첨가제로 사용되는 콜로이드 실리카의 특성이 제조된 촉매의 성능 및 열적 안정성에 미치는 영향을 연구하였다. 이를 위해 4종의 콜로이드 실리카를 대상으로 실리카 형상 및 크기, 비표면적 및 기공특성, 성분 등을 분석하였으며 해당 콜로이드 실리카를 적용하여 제조한 V2O5/TiO2 촉매의 특성 평가 및 NOx 전환율에 대한 연구를 수행하였다. 콜로이드 실리카를 이용하여 제조한 촉매의 특성은 적용한 콜로이드 실리카의 특성에 따라 달라지며, 특히 콜로이드 실리카 내 피독물질 함량은 촉매 성능에 직접적인 영향인자인 것으로 분석되었다. 또한 콜로이드 실리카 내 실리카 함량이 높을수록 촉매의 열안정성과 성능이 향상되는 것으로 나타났다.

Keywords

References

  1. Z. Liu, J. Han, L. Zhao, Y. W. Wu, H. X. Wang, X. Q. Pei, M. X Xu, Q. Lu, and Y. P Yang, Effects of Se and $SeO_2$ on the denitrification performance of $V_2O_5-WO_3/TiO_2$ SCR catalyst, Appl. Catal. A: Gen., 587, 117263(1-9) (2019).
  2. L. Chen, J. Li, and M. Ge, The poisoning effect of alkali metals doping over nano $V_2O_5-WO_3/TiO_2$ catalysts on selective catalytic reduction of NOx by $NH_3$, Chem. Eng. J., 170, 531-534 (2011). https://doi.org/10.1016/j.cej.2010.11.020
  3. F. Gao, X. Tang, H. Yi, S. Zhao, C. Li, J. Li, Y. Shi, and X. Meng, A review on selective catalytic reduction of NOx by $NH_3$ over Mn-based catalysts at low temperatures. Catalysts, mechanisms, kinetics and DFT calculations, Catalysts, 7, 199(1-32) (2017). https://doi.org/10.3390/catal7070199
  4. L. Chen, V. Agrawal, and S. L. Tait, Sulfate promotion of selective catalytic reduction of nitric oxide by ammonia on ceria, Catal. Sci. Tech., 9(8), 1802-1815 (2019). https://doi.org/10.1039/C8CY02590H
  5. P. Forzatti, I. Nova, E. Tronconi, A. Kustov, and J. R. Thogersen, Effect of operating variables on the enhanced SCR reaction over a commercial $V_2O_5-WO_3/TiO_2$ catalyst for stationary applications, Catal. Today, 184, 153-159 (2012). https://doi.org/10.1016/j.cattod.2011.11.006
  6. J. S. Cha, J. C. Choi, J. H. Ko, Y. K. Park, S. H. Park, K. E. Jeong, S. S. Kim, and J. K. Jeon, The low-temperature SCR of NO over rice straw and sewage sludge derived char, Chem. Eng. J., 156, 321-327 (2010). https://doi.org/10.1016/j.cej.2009.10.027
  7. H. Chen, Y. Xia, R. Fang, H. Huang, Y. Gan, C. Liang, J. Zhang, W. Zhang, and X. Liu, The effects of tungsten and hydrothermal aging in promoting $NH_3$-SCR activity on $V_2O_5/WO_3-TiO_2$ catalysts, Appl. Surf. Sci., 459, 639-646 (2018). https://doi.org/10.1016/j.apsusc.2018.08.046
  8. S. Su, S. Feng, Y. Zhao, Q. Lu, W. Cheng, and C. Dong, Comparison of three types of $NH_3$-SCR catalysts, Appl. Mech. Mater., 130-134, 418-421 (2012). https://doi.org/10.4028/www.scientific.net/AMM.130-134.418
  9. R. M. Heck, Catalytic abatement of nitrogen oxides-stationary applications, Catal. Today, 53, 519-523 (1999). https://doi.org/10.1016/S0920-5861(99)00139-X
  10. E. Tronconi and G. Groppi, A study on the thermal behavior of structured plate-type catalysts with metallic supports for gas/solid exothermic reactions, Chem. Eng. Sci., 55, 6021-6036 (2000). https://doi.org/10.1016/S0009-2509(00)00214-1
  11. G. Liu, J. Guo, F. Meng, X. Zhang, and L. Wang, Effects of colloidal silica binder on catalytic activity and adhesion of HZSM-5 coatings for structured reactors, Chin. J. Chem. Eng., 22, 875-881 (2014). https://doi.org/10.1016/j.cjche.2014.06.010
  12. B. Mitra and D. Kunzru, Washcoating of different zeolites on cordierite monoliths, J. Am. Ceram. Soc., 91, 64-70 (2008). https://doi.org/10.1111/j.1551-2916.2007.02032.x
  13. M. A. L. Vargas, M. Casanova, A. Trovarelli, and G. Busca, An IR study of thermally stable $V_2O_5-WO_3-TiO_2$ SCR catalysts modified with silica and rare-earths (Ce, Tb, Er), Appl. Catal. B: Environ., 75, 303-311 (2007). https://doi.org/10.1016/j.apcatb.2007.04.022
  14. Y. Pan, W. Zhao, Q. Zhong, W. Cai, and H. Li, Promotional effect of Si-doped $V_2O_5/TiO_2$ for selective catalytic reduction of NOx by $NH_2$, J. Environ. Sci., 25, 1703-1711 (2013). https://doi.org/10.1016/S1001-0742(12)60181-8
  15. J. S. Cha, J. W. Park, B. Jeong, H. D. Kim, S. S. Park, and M. C. Shin, Thermal deactivation of plate-type $V_2O_5-WO_3/TiO_2$ SCR catalyst, Appl. Chem. Eng., 28, 576-580 (2017). https://doi.org/10.14478/ace.2017.1083
  16. X. Liu, X. Wu, T. Xu, D. Weng, Z. Si, and R. Ran, Effects of silica additive on the $NH_3$-SCR activity and thermal stability of a $V_2O_5/WO_3-TiO_2$ catalyst, Chin. J. Catal., 37, 1340-1346 (2016). https://doi.org/10.1016/S1872-2067(15)61109-3
  17. M. Kobayashi, R. Kuma, S. Masaki, and N. Sugishima, $TiO_2-SiO_2$ and $V_2O_5/TiO_2-SiO_2$ catalyst: Physico-chemical characteristics and catalytic behavior in selective catalytic reduction of NO by $NH_3$, Appl. Catal. B: Environ., 60, 173-179 (2005). https://doi.org/10.1016/j.apcatb.2005.02.030