Abstract
The objective of this study was to determine whether activated char produced from Illinois coal could be used effectively to remove sulfur dioxide from coal combustion flue gas. Chars were prepared from a high-volatile Illinois bituminous coal under a wide range of pyrolysis and activation conditions. A novel char preparation technique was developed to prepare chars with SO 2 adsorption capacities significantly greater than that of a commercial activated carbon. In general, there was no correlation between SO 2 adsorption capacity and surface area. Temperature-programmed desorption (TPD) was used to determine the nature and extent of carbon-oxygen (CO) complexes formed on the char surface. TPD data revealed that SO 2 adsorption was inversely proportional to the amount of CO complex. The formation of a stable CO complex during char preparation may have served only to occupy carbon sites that were otherwise reactive towards SO 2 adsorption. A fleeting C(O) complex formed during SO 2 adsorption is postulated to be the reaction intermediate necessary for conversion of SO 2 to H 2SO 4.
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