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http://dx.doi.org/10.9713/kcer.2012.50.3.398

Selective Oxidation of Hydrogen Sulfide Containing Ammonia and Water Using Fe2O3/SiO2 Catalyst  

Kim, Moon-Il (Division of Chemical and Biomolecular Engineering, Pusan National University)
Lee, Gu-Hwa (Division of Chemical and Biomolecular Engineering, Pusan National University)
Chun, Sung-Woo (Jeong Won Chemical Co., Ltd.)
Park, Dae-Won (Division of Chemical and Biomolecular Engineering, Pusan National University)
Publication Information
Korean Chemical Engineering Research / v.50, no.3, 2012 , pp. 398-402 More about this Journal
Abstract
The catalytic performance of some metal oxides in the vapor phase selective oxidation of $H_2S$ in the stream containing ammonia and water was investigated. Among the catalysts tested $Fe_2O_3/SiO_2$ was the most promising catalyst for practical application. It showed higher than 90% $H_2S$ conversion and very small amount of $SO_2$ emission over a temperature range of $240{\sim}280^{\circ}C$. The effects of reaction temperature, $O_2/H_2S$ ratio, amount of ammonia and water vapor on the catalytic activity of $Fe_2O_3/SiO_2$ were discussed to better understand the reaction mechanism. The $H_2S$ conversion showed a maximum at $260^{\circ}C$ and it decreased with increasing temperature over $280^{\circ}C$. With an increase of $O_2/H_2S$ ratio from 0.5 to 4, the conversion was slightly increased, but the selectivity to elemental sulfur was remarkably decreased. The increase of ammonia amount favored the conversion and the selectivity to elemental sulfur with a decrease in $SO_2$ production. The presence of water vapor decreased both the activity and the selectivity to sulfur, but increased the ATS selectivity.
Keywords
Hydrogen Sulfide; Selective Oxidation; Ammonia; Water Vapor; $Fe_2O_3/SiO_2$;
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