Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on Na effect of Pt-Na/Ce(1-x)Zr(x)O2 Catalyst Structure for WGS Reaction

WGS 반응에서 Pt-Na/Ce(1-x)Zr(x)O2 촉매의 구조에 따른 Na 영향에 대한 연구

  • Shim, Jae-Oh (Department of Environmental Engineering, Yonsei University) ;
  • Jeong, Dae-Woon (Department of Environmental Engineering, Yonsei University) ;
  • Jang, Won-Jun (Department of Environmental Engineering, Yonsei University) ;
  • Roh, Hyun-Seog (Department of Environmental Engineering, Yonsei University)
  • Received : 2012.11.05
  • Accepted : 2012.12.31
  • Published : 2012.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

The interest in water gas shift (WGS) reaction has grown significantly, as a result of the recent advances in fuel cell technology and the need to develop small-scale fuel processors. Recently, researchers have tried to overcome the disadvantages of the commercial WGS catalysts. As a consequence, supported Pt catalysts have attracted a lot of researchers due to high activity and stability for WGS at low temperatures. In this study, $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts with various Ce/Zr ratio have been applied to WGS at a gas hourly space velocity (GHSV) of $45,515h^{-1}$. According to TPR patterns of $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts, the reducibility increases with decreasing the $ZrO_2$ content. As a result, Cubic structure $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts exhibited higher CO conversion than tetragonal structure $Pt-Na/Ce_{(1-x)}Zr_{(x)}O_2$ catalysts. Expecially, Pt-Na/$CeO_2$ exhibited the highest CO conversion as well as 100% selectivity to $CO_2$. Moreover, Pt-Na/$CeO_2$ catalyst showed relatively stable activity with time on stream. The high activity of cubic structure Pt-Na/$CeO_2$ catalyst was correlated to its higher oxygen storage capacity (OSC) of $CeO_2$ and easier reducibility of Pt/$CeO_2$.

Keywords

References

  1. H.-S. Roh, D.-W. Jeong, K.-S. Kim, I.-H. Eum, K. Y. Koo, and W. L. Yoon, "Single stage water-gas shift reaction over supported Pt catalysts", Catal. Lett., Vol. 141, 2011, pp. 95-99. https://doi.org/10.1007/s10562-010-0480-3
  2. X. Zhu, T. Hoang, L.L. Lobban, R.G. Mallinson, "Significant improvement in activity and stability of $Pt/TiO_2$ catalysts for water gas shift reaction via controlling the amount of Na addition" Catal. Lett., Vol. 129, 2009, pp. 135-141. https://doi.org/10.1007/s10562-008-9799-4
  3. D.-W. Jeong, H. S. Potdar, H.-S. Roh, "Comparative Study on Nano-Sized 1 wt% $Pt/Ce){0.8}Zr_{0.2}O_2$ and $Pt/Ce_{0.2}Zr_{0.8}O_2$ Catalysts for a Single Stage Water Gas Shift Reaction", Catal. Lett., Vol. 142, 2012, pp. 212-216.
  4. D.-W. Jeong, J.-O. Shim, W.-J. Jang, H.-S. Roh, "A Study on $Pt-Na/CeO_2$ Catalysts for Single Stage Water Gas Shift Reaction", Trans. of the Korean Hydrogen and New Energy Society, Vol. 23, 2012, pp. 111-116. https://doi.org/10.7316/KHNES.2012.23.2.111
  5. J. H. Pazmino, M. Shekhar, W. Damion Williams, M. Cem Akatay, J. T. Miller, W. Nicholas Delgass, and F. H. Ribeiro, "Metallic Pt as active sites for the water-gas shift reaction on alkali-promoted supported catalysts", J. Catal., Vol. 286, 2012, pp. 279-286. https://doi.org/10.1016/j.jcat.2011.11.017
  6. P. Panagiotopoulou, J. Papavasiliou, G. Avgouropoulos, T. Ioannides, and D. I. Kondarides, "Water-gas shift activity of doped $Pt/CeO_2$ catalysts", Chem. Eng. J., Vol. 134, 2007, pp. 16-22. https://doi.org/10.1016/j.cej.2007.03.054
  7. A. Kambolis, H. Matralis, A. Trovarelli, and Ch. Papadopoulou, "$Ni/CeO_2-ZrO_2$ catalysts for the dry reforming of methane", Appl. Catal. A: Gen, Vol. 377, 2010, pp. 16-26. https://doi.org/10.1016/j.apcata.2010.01.013
  8. X. Zhu, M. Shen, L.L. Lobban, R.G. Mallinson, "Structural effects of Na promotion for high water gas shift activity on $Pt-Na/TiO_2$", J. Catal., Vol. 278, 2011, pp. 123-132. https://doi.org/10.1016/j.jcat.2010.11.023