Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Selective Oxidation of Hydrogen Sulfide to Elemental Sulfur with Fe/MgO Catalysts in a Slurry Reactor

  • Lee, Eun-Ku (Department of Chemical Engineering, Yonsei University) ;
  • Jung, Kwang-Deog (Eco-Nano Center, Korea Institute of Science and Technology) ;
  • Joo, Oh-Shim (Eco-Nano Center, Korea Institute of Science and Technology) ;
  • Shul, Yong-Gun (Department of Chemical Engineering, Yonsei University)
  • Published : 2005.02.20
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Abstract

The Fe/MgO catalysts with different Fe loadings (1, 4, 6, 15 and 30 wt% Fe) were prepared by a wet impregnation with iron nitrate as precursor. All of the catalysts were characterized by BET surface analyzer, X-ray diffraction (XRD), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS). The maximum removal capacity of $H_2S$ was obtained with 15 wt% Fe/MgO catalyst which had the highest BET surface area among the measured catalysts. XRD of Fe/MgO catalysts showed that well dispersed Fe particles could be present on Fe/MgO with Fe loadings below 15 wt%. The crystallites of bulk $\alpha$-$Fe_2O_3$ became evident on 30 wt% Fe/MgO, which were confirmed by XRD. TPR profiles showed that the reducibility of Fe/MgO was strongly related to the loaded amounts of Fe on MgO support. Therefore, the highest removal efficiency of $H_2S$ in wet oxidation could be ascribed to a good dispersion and high reducibility of Fe/MgO catalyst. XPS studies indicated that the $H_2S$ oxidation with Fe/MgO could proceed via the redox mechanism ($Fe^{3+}\;{\leftrightarrow}\;Fe^{2+}$).

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