Effect of the redox properties of support oxide over cobalt-based catalysts in high temperature water-gas shift reaction

Ajay Jha, Yeol Lim Lee, Won Jun Jang, Jae Oh Shim, Kyung Won Jeon, Hyun Suk Na, Hak Min Kim, Hyunseog Roh, Dae Woon Jeong, Sang Goo Jeon, Jeong Geol Na, Wang Lai Yoon

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Abstract

The present study focused on the effect of reducibility of support oxide (CeO2, ZrO2, TiO2, and Al2O3) over the activity of cobalt-based catalysts in high temperature water-gas shift (HT-WGS) reaction. The H2 temperature programmed reduction (TPR) and CO chemisorption characterization results showed that dispersion of cobalt over the support was increased with the increase of the reducibility of the support oxide. The supported catalysts were characterized by X-ray diffraction (XRD) and N2 adsorption–desorption. The results indicated that the Co/CeO2 catalyst possesses the highest surface area and metal dispersion in the series; Co/CeO2 > Co/ZrO2 > Co/Al2O3 > Co/TiO2. The activity results showed that Co/CeO2 was the highly active among the tested catalysts in the temperature range of 350–550 °C. Moreover, the time-on-stream study revealed that the Co/CeO2 catalyst was relatively more stable than cobalt supported on ZrO2 and Al2O3 oxides. The excellent activity and stability of the Co/CeO2 catalyst were attributed to its high metal dispersion, which is found strongly dependent on the reducible nature of the support.

Original languageEnglish
Pages (from-to)145-152
Number of pages8
JournalMolecular Catalysis
Volume433
DOIs
Publication statusPublished - 2017 Jan 1

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

Cite this

Jha, A., Lee, Y. L., Jang, W. J., Shim, J. O., Jeon, K. W., Na, H. S., Kim, H. M., Roh, H., Jeong, D. W., Jeon, S. G., Na, J. G., & Yoon, W. L. (2017). Effect of the redox properties of support oxide over cobalt-based catalysts in high temperature water-gas shift reaction. Molecular Catalysis, 433, 145-152. https://doi.org/10.1016/j.mcat.2016.12.028