Adsorption dynamics of hydrogen sulfide in impregnated activated carbon bed
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Adsorption dynamics of hydrogen sulfide in impregnated activated carbon bed Do-Young Choi · Jae-Wook Lee · Seong-Cheol Jang · Byoung-Sung Ahn · Dae-Ki Choi
Received: 1 May 2007 / Revised: 4 March 2008 / Accepted: 20 March 2008 / Published online: 15 May 2008 © Springer Science+Business Media, LLC 2008
Abstract Potassium iodide (KI) impregnated activated carbons were prepared and applied for the removal of hydrogen sulfide. The adsorption dynamics of the prepared adsorbents were investigated in fixed-bed column as functions of the concentration of hydrogen sulfide and oxygen, and relative humidity. It was found that the adsorption capacity was highly dependent on the oxygen concentration because of the chemical adsorption of hydrogen sulfide on KI impregnated activated carbon. The adsorbents before and after adsorption of hydrogen sulfide were characterized by BET, SEM and EDS analysis. Keywords Adsorption · Hydrogen sulfide · Impregnation · Humidity · Activated carbon
1 Introduction Hydrogen sulfide originating from various sources such as chemical processing gases from coal, natural gas and synthetic gas can be regarded as a major air pollutant (Ikeda et al. 1988). For the removal of hydrogen sulfide, many techniques such as amine absorption, liquid redox processes, adsorption process, and catalytic oxidation. Among them, activated carbon adsorption has been widely used for the pollution control of odor gases like hydrogen sulfide (Smisek and
Cerny 1970; Bansal et al. 1988; Turk et al. 1989, 1993; Bandosz 1999). In especial, activated carbons treated with caustic materials such as KOH, NaOH and KI have been widely used for hydrogen sulfide adsorption (Ikeda et al. 1988; Takeuchi et al. 1999; Lee and Reucroft 1999). Potassium iodide (KI) used as impregnant in this study has positioned itself as one of the promising chemical substances to increase removal efficiency of hydrogen sulfide by enhancing selective adsorptivity of hydrogen sulfide. It has been known that the increase in removal efficiency of hydrogen sulfide is caused by the changes in the surface functional groups of activated carbon due to the impregnation of KI and its catalytic action. Unfortunately, systematic studies on the surface chemistry and column dynamics of KI impregnated activated carbon for the removal of hydrogen sulfide has not yet been addressed. This study focused on the adsorption column dynamics of KI impregnated activated carbon for the removal of hydrogen sulfide under key operating conditions such as concentrations of hydrogen sulfide and oxygen, and relative humidity. The adsorbents properties before and after adsorption of hydrogen sulfide were investigated by BET, SEM and EDS analysis.
2 Experimental 2.1 Materials
D.-Y. Choi · S.-C. Jang · B.-S. Ahn · D.-K. Choi () Environment & Process Technology Division, Korea Institute of Science Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul 136-791, Korea e-mail: [email protected] J.-W. Lee Department of Chemical and Biochemical Engineering, Chosun University, Gwangju 501-759, Korea
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