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Influence of Active Metal Dispersion over Pt/TiO2 Catalyst on NH3-SCO Reaction Activity

Pt/TiO2 촉매의 활성금속 분산도가 NH3-SCO 반응활성에 미치는 영향

  • Shin, Jung Hun (Department of Environmental Energy Engineering, Graduate school of Kyonggi University) ;
  • Kwon, Dong Wook (Materials Architecturing Research Center, Korea Institute of Science and Technology) ;
  • Kim, Geo Jong (Department of Environmental Energy Engineering, Graduate school of Kyonggi University) ;
  • Hong, Sung Chang (Department of Environmental Energy Engineering, Kyonggi University)
  • 신중훈 (경기대학교 일반대학원 환경에너지공학과) ;
  • 권동욱 (한국과학기술연구원 미래융합기술본부 물질구조제어연구센터) ;
  • 김거종 (경기대학교 일반대학원 환경에너지공학과) ;
  • 홍성창 (경기대학교 환경에너지공학과)
  • Received : 2017.09.17
  • Accepted : 2017.10.31
  • Published : 2018.02.10

Abstract

In this study, the effect of physical properties of $Pt/TiO_2$ on $NH_3$-selective catalytic oxidation (SCO) reaction at $200{\sim}350^{\circ}C$ was investigated. CO-chemisoption and BET analysis were carried out to verify physical properties of $Pt/TiO_2$. By characterizing physical properties of $Pt/TiO_2$ with respect to the Pt loading, the metal dispersion degree decreased as a function of the Pt loading amount. Also, the catalyst having a higher metal dispersion showed an excellent conversion efficiency of $NH_3$ to $N_2$. Since the specific surface area of the support affects the metal dispersion, $Pt/TiO_2$ catalysts were prepared using $TiO_2$ with different physical properties. As a result, it was confirmed that the catalyst having a wide specific surface area exhibited a excellent conversion of $NH_3$ to $N_2$.

Keywords

$NH_3$;$PM_{2.5}$;catalyst;selective catalytic oxidation;Pt

Acknowledgement

Grant : 고효율 복합 SCR/AOC 촉매 개발

Supported by : 환경부

References

  1. M. Amblard, R. Burch, and B. W. L Southward, The selective conversion of ammonia to nitrogen on metal oxide catalysts under strongly oxidising conditions, Appl. Catal. B, 22, 159-166 (1999).
  2. J. Y. Lee, S. B. Kim, and S. C. Hong, Characterization, and reactivity of natural manganese ore catalysts in the selective catalytic oxidation of ammonia to nitrogen, Chemosphere, 50, 1115-1122 (2003).
  3. M. J. Lippits, A. C. Gluhoi, and B. E. Nieuwenhuys, A comparative study of the selective oxidation of $NH_3$ to $N_2$ over gold, silver and copper catalysts and the effect of addition of $Li_2O$ and CeOx, Catal. Today, 137, 446-452 (2008).
  4. S. A. C. Carabineiro, A. V. Matveev, V. V. Gorodetskii, and B. E. Nieuwenhuys, Selective oxidation of ammonia over Ru(0001), Surf. Sci., 555, 83-93 (2004).
  5. R. Q. Long and R. T. Yang, Selective catalytic oxidation of ammonia to nitrogen over $Fe_2O_3$-$TiO_2$ prepared with a sol-gel method, J. Catal., 207, 158-165 (2002).
  6. A. Wollner, F. Lange, H. Schmeltz, and H. Knozinger, Characterization of mixed copper-manganese oxides supported on titania catalysts for selective oxidation of ammonia, Appl. Catal. A, 94, 181-203 (1993).
  7. S. M. Lee, H. H. Lee, and S. C. Hong, Influence of calcination temperature on Ce/$TiO_2$ catalysis of selective catalytic oxidation of $NH_3$ to $N_2$, Appl. Catal. A, 470, 189-198 (2014).
  8. N. I. Il'chenko, Catalytic oxidation of ammonia, Russ. Chem. Rev., 45, 1119-1134 (1976).
  9. E. Xue, K. Seshan, and J. R. H. Ross, Roles of supports, Pt loading and Pt dispersion in the oxidation of NO to $NO_2$ and of $SO_2$ to $SO_3$, Appl. Catal. B, 11, 65-79 (1996).
  10. Y. Li and J. N. Armor, Selective $NH_3$ oxidation to $N_2$ in a wet stream, Appl. Catal. B, 13, 131-139 (1997).
  11. C. Zhang, H. He, and K. Tanaka, Catalytic performance and mechanism of a Pt/$TiO_2$ catalyst for the oxidation of formaldehyde at room temperature, Appl. Catal. B, 65, 37-43 (2006).
  12. D. W. Kwon, P. W. Seo, G. J. Kim, and S. C. Hong, Characteristics of the HCHO oxidation reaction over Pt/$TiO_2$ catalysts at room temperature: the effect of relative humidity on catalytic activity, Appl. Catal. B, 163, 436-443 (2015).
  13. G. J. Kim, D. W. Kwon, and S. C. Hong, Effect of Pt particle size and valence state on the performance of Pt/$TiO_2$ catalysts for CO oxidation at room temperature, J. Phys. Chem. C, 120, 17996-18004 (2016).
  14. S. M. Lee and S. C. Hong, Promotional effect of vanadium on the selective catalytic oxidation of $NH_3$ to $N_2$ over Ce/V/$TiO_2$ catalyst, Appl. Catal. B, 163, 30-39 (2015).
  15. N. Jain, N. Ravishankar, and G. Madras, Spectroscopic and kinetic insights of Pt-dispersion over microwave-synthesized GO-supported Pt-$TiO_2$ for CO oxidation, J. Mol. Catal., 432, 88-98 (2017).