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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received August 4, 2004
Accepted November 15, 2004

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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A Study on Selective Oxidation of Hydrogen Sulfide over Zeolite-NaX and -KX Catalysts

Jong Dae Lee Jin Hyuk Jun No-Kuk Park Si-Ok Ryu Tae-Jin Lee^†

National Research Laboratory, School of Chemical Engineering & Technology, Yeungnam University, Gyeongsan 712-749, Korea

Korean Journal of Chemical Engineering, January 2005, 22(1), 36-41(6), 10.1007/BF02701459

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Abstract

Selective oxidation of hydrogen sulfide (H2S) was studied on zeolite-NaX and zeolite-KX. Elemental sulfur yield over zeolite-NaX was achieved about 90% at 225 oC for the first 4 hours, but it gradually decreased to 55% at 40 hours after the reaction started. However, yield of elemental sulfur on zeolite-KX was obtained within the range of 86% at 250 oC after 40 hours. The deactivation of the zeolite-NaX and -KX catalysts was caused by the coverage of a sulfur compound, produced by the selective oxidation of H2S over the catalysts. The coverage of a sulfur compound over the zeolite-NaX and -KX was confirmed by the TPD (temperature-programmed desorption) tests utilizing thermogravimetric analysis and FT-IR analysis. Even though high temperature was required to prevent the deactivation of zeolite-NaX, the temperature cannot be raised to 250 oC or above due to the SO2 production and the decrease of thermodynamic equilibrium constant. Zeolite-KX was superior to the zeolite-NaX for both its selectivity to elemental sulfur and its resistance to deactivation in the selective oxidation of H2S.

Keywords

Elemental Sulfur Selective Oxidation of Hydrogen Sulfide Zeolite-NaX Zeolite-KX Deactivation

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