Abstract
Zeolite 13X was synthesized from palm oil mill fly ash (POMFA) using an alkaline fusion method. A zeolite 13X yield of 85% was obtained at a mass ratio of NaOH/(SiO2 and Al2O3 precursors) of 1.6, a fusion temperature of 600°C and a fusion time of 60min. Acid activation was performed on the zeolite 13X product in order to enhance its CO2 adsorption capacity. Acid activation with 4–8MHCl for 4h produced a marked increase in the mesopore and total pore volumes of the zeolite 13X. This increased mesopore volume resulted in CO2 adsorption capacities of the acid-activated zeolite 13X at 6MHCl for 4h that were 22% higher than those of the unactivated zeolite 13X and 11% higher than those of the commercial zeolite 13X. The CO2 adsorption capacity obtained was 6.42mol CO2/kg at a pressure of 403kPa and a temperature of 32°C.
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