Production and use of activated char for combined SO{sub 2}/NO{sub x} removal. Technical report, March 1--May 31, 1995
- Illinois State Geological Survey, Champaign, IL (United States)
- Illinois Univ., Urbana, IL (United States)
- Research Triangle Inst., Research Triangle Park, NC (United States)
Carbon adsorbents have been shown to remove sulfur oxides from combustion flue gas, and also serve as a catalyst for reduction of nitrogen oxides at temperatures between 80 and 150{degree}C. The overall objective of this project is to determine whether Illinois coal is a suitable feedstock for the production of activated char which could be used as a catalyst for combined S0{sub 2}2/NO{sub x} removal, and to evaluate the potential application of the products in flue gas cleanup. Chars were prepared from IBC-102 coal under a wide range of pyrolysis and activation conditions. A novel char preparation technique was used to produce chars with S0{sub 2} adsorption capacities significantly greater than that of a commercial activated carbon. No correlation was found between the S0{sub 2} adsorption capacity and N{sub 2} BET surface area of the char. In addition, the S0{sub 2} capacity was inversely proportional to the amount of carbon-oxygen (C-0) complex on the char surface. The formation of stable C-0 complex during char preparation served only to occupy carbon sites that were otherwise reactive towards S0{sub 2} adsorption. The SO{sub 2} capacity of a series of IBC-102 chars normalized with respect to the number of unoccupied (free) sites on the char surface varied by less than a factor of two, which indicated an excellent correlation. Based on these results, a new mechanism for S0{sub 2} adsorption on carbon and conversion to H{sub 2}S0{sub 4} was proposed. The NO{sub x} removal potential of selected EBC-102 chars and commercial carbons were evaluated at temperatures between 22 and 130{degree}C. An IBC-102 char with superior NO{sub x} removal properties was identified. This high-activity char achieved 80% NO{sub x} removal at 22{degree}C. Further work is needed to discern the NO{sub x} removal mechanism.
- Research Organization:
- Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-92PC92521
- OSTI ID:
- 10137682
- Report Number(s):
- DOE/PC/92521-T245; ON: TI96020469; BR: AV0100000/AV0102000
- Resource Relation:
- Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
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