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Volume 13, No. 1, February 2013, Pages 209-218 PDF(481 KB)  
doi: 10.4209/aaqr.2012.02.0037   

Influence of CO and H2 Concentrations on Coal Gas Dechlorination by Supported Manganese Oxide Sorbent

Ting Ke Tseng, Ling Wang, Hsin Chu

Department of Environmental Engineering and Research Center for Energy Technology and Strategy, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan

 

Abstract

 

The Mn2O3/SiO2 sorbent prepared by incipient wetness impregnation was investigated for the elimination of chlorine species produced from coal gasification. The experiments were conducted in a fixed-bed reactor at 673 K with the Mn2O3/SiO2 sorbent at various CO and H2 concentrations to evaluate their influences on the dechlorination performance. It was observed that the absence of inlet H2 led to a drastic decrease in the sorbent capacity; i.e., the presence of H2 was essential for achieving dechlorination. Furthermore, the concentration of CO seemed to have no obvious effect on the HCl removal.
    Through the breakthrough experiments, X-ray powder diffractometer, and Fourier transform infrared spectroscopy analysis, the overall dechlorination mechanism of the Mn2O3/SiO2 sorbent in a chlorine-containing coal gas system was successfully described in this study. The mechanism consisted of three major routes: (a) Mn2O3 reacted with HCl to form MnCl2, (b) Mn2O3 was first reduced into Mn3O4 and then reacted with HCl to produce MnCl2, and (c) without the involvement of HCl in the dechlorination experiments, the Mn2O3 contained in the fresh sorbent was first reduced to Mn3O4 and then to MnO under the strong reducing atmosphere provided by CO and/or H2.

 

 

Keywords: Dechlorination; Sorbent; Mn2O3; H2; IGCC.

 

 

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