You are here:
BENCH-SCALE INVESTIGATION OF MECHANISMS OF ELEMENTAL MERCURY CAPTURE BY ACTIVATED CARBON
Citation:
Jozewivz, W., S. Krishnan, AND B. Gullett. BENCH-SCALE INVESTIGATION OF MECHANISMS OF ELEMENTAL MERCURY CAPTURE BY ACTIVATED CARBON. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/132.
Description:
The paper gives results of an investigation of the sorption and desorption of gaseous elemental mercury by activated carbon sorbents. wo sorbents were chosen for the study, one (PC-100) thermally activated and the other (HGR) chemically impregnated with sulfur. he sorbents had similar particle size (approximately 20 micrometers) and surface area (approximately 1000 sq m/g). ifferent reaction conditions of temperature--23 C (or ambient) and 140 C--and mercury concentration (30 and 60 ppb in nitrogen) were used. he type of activated carbon, the temperature, and the mercury concentration showed strong effects on overall sorption behavior. t was found that lowering the operating temperature from 140 to 23 C lowered the sorptive capacity of HGR (20-25 micrometers), but increased the sorptive capacity of PC-100. or both sorbents, a desorption study of the reacted sorbents indicated a combination of physisorption and chemisorption at 23 C, with chemisorption being the dominant mechanism of capture. t 140 C, chemisorption was found to be the only mechanism for elemental mercury capture for both sorbents.