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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 2
BKCSDE 26(2)
February 20, 2005 

Selective Oxidation of Hydrogen Sulfide to Elemental Sulfur with Fe/MgO Catalysts in a Slurry Reactor
Eun-Ku Lee, Kwang-Deog Jung*, Oh-Shim Joo, Yong-Gun Shul
Fe/MgO catalyst, Wet oxidation, H2S, Redox mechanism
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 H2S 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 α-Fe2O3 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 H2S in wet oxidation could be ascribed to a good dispersion and high reducibility of Fe/MgO catalyst. XPS studies indicated that the H2S oxidation with Fe/MgO could proceed via the redox mechanism (Fe3+ ↔ Fe2+).
281 - 284
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