Effect of impregnation protocol on physical characteristics and adsorptive properties of sulfur impregnated carbon for vapor-phase mercury
- Univ. of Pittsburgh, PA (United States). Dept. of Civil and Environmental Engineering
Removal efficiency of commercially available sulfur-impregnated carbon (HGR) and bituminous coal-based activated carbon impregnated with sulfur at 250 C, 400 C and 600 C (BPL-S) for vapor-phase elemental mercury was evaluated under various process conditions. Based on the fixed-bed breakthrough experiments, both HGR and BPL-S carbon exhibited improved mercury removal efficiency compared to the virgin carbon (BPL). However, the BPL-S series had higher mercury uptake capacity than that of HGR for the influent mercury concentration of 55 g/m{sup 3} and at the operating temperature of 140 C. For the BPL-S series, impregnation temperature was an important factor which affected the capacity for mercury uptake. BPL-S impregnated at 600 C (BPL-S-600) had the highest removal capacity, while BPL-S-400 exhibited slightly lower capacity. BPL-S-250 exhibited significantly lower capacity when compared to BPL-S-600 and BPL-S-400. The actual sulfur content for HGR and BPL-S series were almost the same (10%), except BPL-S-250 which had much higher sulfur content of 36%. Specific surface area, as determined by the BET method, and bonding between sulfur and carbon, as determined by thermogravimetric analysis (TGA), were also dependent on the impregnation procedure. Higher impregnation temperatures promote more uniform distribution of low molecular weight sulfur allotropes on the carbon surface. Pore size distribution study showed the detailed micro-structure of these activated carbons. Most of the pores of HGR carbon have radius between 15--24 , while the radius of BPL-S pores was between 15--35 . As the impregnation temperature decreases, the portion of larger pores also decreases from BPL-S-600 to BPL-S-250.
- DOE Contract Number:
- FG22-96PC96212
- OSTI ID:
- 351111
- Report Number(s):
- CONF-970677-; TRN: IM9925%%273
- Resource Relation:
- Conference: 90. annual meeting and exhibition of the Air and Waste Management Association, Toronto (Canada), 8-13 Jun 1997; Other Information: PBD: 1997; Related Information: Is Part Of 1997 proceedings of the Air and Waste Management Association`s 90. annual meeting and exhibition; PB: [7000] p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Evaluation of carbon-based substrates for the production of economical mercury sorbents
Development of impregnated sorbents for the control of elemental mercury emissions from coal-fired power plants