Production and use of activated char for combined SO{sub 2}/NO{sub x} roval
- Illinois State Geological Survey, Champaign, IL (United States)
Carbon-based systems for combined SO{sub 2}/NO{sub x} removal are presently being marketed in the U.S. This technology has been used in Europe and Japan for cleanup of flue gas from both coal combustion and waste incineration. The type of carbon used more often than not, dictates the economic viability of a given process. The objective of our research has been to produce activated char from Illinois coal with optimum properties for removal of SO{sub 2} and NO{sub x} from combustion flue gas. Chars with varying pore structure and surface chemistry were prepared from an Illinois coal under a wide range of pyrolysis and activation conditions, and tested for their ability to remove SO{sub 2} and NO{sub x} from simulated flue gas. A novel char preparation method was used to produce a material with high activity for SO{sub 2} and NO{sub x} removal. An attempt was made to related the physical and chemical properties of the chars to observed SO{sub 2} adsorption behavior. No correlation was found between SO{sub 2} capacity and surface area. Temperature programmed desorption (TPD) was used to determine the nature and extent of carbon-oxygen (C-O) complex formation; SO{sub 2} adsorption was inversely proportional to the amount of C-O complex on the carbon surface. The formation of stable C-O complex during char preparation may have saved only to occupy carbon sites that were otherwise reactive towards SO{sub 2} adsorption. The number of free adsorption sites measured by TPD showed an excellent correlation with the SO{sub 2} adsorption capacities of the chars. Based on these results, a new mechanism for SO{sub 2} adsorption on carbon and conversion to H{sub 2}SO{sub 4} is proposed and discussed.
- OSTI ID:
- 214792
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Production and use of activated char for combined SO{sub 2}/NO{sub x} removal. Technical report, March 1--May 31, 1995
Production and use of activated char for combined SO{sub 2}/NO{sub x} removal. [Quarterly] technical report, September 1--November 30, 1994