Abstract
The CO2 adsorption characteristics of palm shell activated carbon (AC) impregnated with monoethanolamine (MEA) and with diethanolamine (DEA) were compared. The impregnation of the AC with 3% MEA and 3% DEA yielded loadings of 2.46mol MEA/kg AC and 1.33mol DEA/kg AC, respectively. The impregnation with MEA and DEA caused reductions of micropore surface areas by 52% and 11%, respectively. The saturation adsorption capacities of the AC-DEA were found to be above those of the AC-MEA at 40–70°C. A maximum CO2 adsorption capacity of 5.3mol/kg was obtained for the AC-DEA at 400kPa and 70°C. Under atmospheric pressure, the breakthrough capacities of the AC-MEA samples were lower than those of the AC-DEA samples at all temperatures investigated. The saturation capacities of the AC-MEA were also lower than for the AC-DEA by approximately the same percentages as for the breakthrough capacities. At the regeneration temperature of 160°C, the regeneration times for the AC-MEA were found to be at least 20min longer than the times for the AC-DEA. This difference was possibly due to higher intraparticle mass transfer resistance in the AC-MEA than in the AC-DEA. Based on both adsorption and desorption characteristics, DEA was suggested to be a more suitable impregnating agent for palm shell activated carbon.
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