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Received September 1, 2004
Accepted December 28, 2004
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Selective Oxidation of Hydrogen Sulfide Containing Excess Water and Ammonia over Bi-V-Sb-O Catalysts
Department of Chemical Engineering, Pusan National University, Busan 609-735, Korea 1Department of Chemical Engineering, Pukyung National University, Busan 608-739, Korea
dwpark@pusan.ac.kr
Korean Journal of Chemical Engineering, March 2005, 22(2), 190-195(6), 10.1007/BF02701483
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Abstract
We investigated the selective oxidation of hydrogen sulfide to elemental sulfur and ammonium thiosulfate by using Bi4V2-xSbxO11-y catalysts. The catalysts were prepared by the calcination of a homogeneous mixture of Bi2O3, V2O5, and Sb2O3 obtained by ball-milling adequate amounts of the three oxides. The main phases detected by XRD analysis were Bi4V2O11, Bi1.33V2O6, BiSbO4 and BiVO4. They showed good H2S conversion with less than 2% of SO2 selectivity with a feed composition of H2S/O2/NH3/H2O/He=5/2.5/5/60/27.5 and GHSV=12,000 h-1 in the temperature ranges of 220-260 ℃. The highest H2S conversion was obtained for x=0.2 in Bi4V2-xSbxO11-y catalyst. TPR/TPO results showed that this catalyst had the highest amount of oxygen consumption. XPS analysis before and after reaction_x000D_
confirmed the least reduction of vanadium oxide phase for this catalyst during the reaction. It means that the catalyst with x=0.2 had the highest reoxidation capacity among the Bi4V2.xSbxO11.y catalysts.
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