SO2 adsorption capacity of K2CO3-impregnated activated carbon as a function of K2CO3 content loaded by soaking and incipient wetness

Ammonia, cyclohexane, nitrogen and water adsorption capacities of an activated carbon impregnated with increasing amounts of ZnCl2, and designed to chemisorb gaseous NH3 from an air stream

“…Note that the pH before 5 min was not calculated, it was simply matched. The fact that the pH of the scrubbing solution is acidic is due to the presence of CO 2 in the air as explained by Fortier et al [37].…”

“…The number of acidic sites determined using KHCO 3 , K 2 CO 3 and KOH were 0.00, 0.07 and 0.09 mmol/g AC, respectively. ZnCl 2 (Aldrich, ACS reagent grade) was impregnated on GC via the incipient wetness method [37][38][39]. The concentrations of the ZnCl 2 imbibing solutions were selected to produce the desired loadings of impregnant, 0.137 to 4.45 mmol ZnCl 2 /g AC, when the imbibing limits were reached.…”

“…This is in contrast with concentrated solutions of K 2 CO 3 which do not penetrate the pore system of activated carbons. The imbibing limit is 0.70 mL/g AC in GC for water and 0.07 mL/g AC for 2.0 M K 2 CO 3 , respectively [37][38][39]. The ZnCl 2 loadings were assessed gravimetrically.…”

“…NH 3 and SO 2 , has been described in a previous article [37]. In short, 1000 ppm of NH 3 is flowed through the sample, and into a scrubbing solution.…”

Understanding the role of each ingredient in a basic copper carbonate based impregnation recipe for respirator carbons

“…However, the reasons for the success of this impregnant and the reasons for the various ingredients in the recipes are not clearly described in the literature. It has been shown [4][5][6][7] that the dispersion of the impregnant as nanoscopic particles or as a nanoscopic layer on the surface of activated carbon helps to increase the stoichiometric ratio of reaction of the impregnant with the toxic challenge gas. The various ingredients in the ''preferred" recipes affect the dispersion of the impregnant and/or the phase of the impregnant formed at a particular heating temperature.…”