The Efficiency of Carbon Dioxide and Hydrogen Sulphide Adsorption using Impregnated Granular Activated Carbon and Zeolite

To cite this article: Anuwattana, R., Phungngamphan, P. & Chawakitchareon, P. (2018). The efficiency of carbon dioxide and hydrogen sulphide adsorption using impregnated granular activated carbon and zeolite. J. Phys. Sci., 29(Supp. 3), 29–36,


In this work, adsorbents granular activated carbon (GAC), granular activated carbon with acetylene (CVD/GAC) and zeolite A were applied for carbon dioxide (CO2) and hydrogen sulphide (H2S) gas removal. The adsorbents were characterised by scanning electron microscope (SEM) and X-ray diffraction (XRD). Polyethyleneimine (PEI) in ethanol with initial concentration of 0.2 g l–1 and 1 mol dm–3 lithium nitrate (LiNO3) were prepared to improve the adsorption capacity. In the impregnation process, various adsorbents, i.e., GAC, CVD/GAC and zeolite A were placed in a vial containing 0.2 g l–1 of PEI and 1 mol dm–3 of LiNO3 solution, at different ratios of adsorbent and various solutions of 30%W/W. The adsorbents (GAC, PEI/CVD/GAC:PEI/GAC, LiNO3/CVD/GAC:LiNO3/GAC, zeolite 5A, PEI/zeolite 5A and LiNO3/zeolite 5A) were tested by using the synthetic biogas (45% CO2, 10% N2, 45% CH4 and 105 mg dm–3 of H2S). The performance of CO2 and H2S adsorption results have shown that PEI/CVD/GAC is the best adsorbent for low concentration of H2S and LiNO3/5A is the best adsorbent for CO2 adsorption. The purity of the outlet methane was 96.6%, 97.3%, 98.1%, 81.53%, 80.6% and 93.6% for zeolite 5A, LiNO3/5A, PEI/5A, GAC, LiNO3/CVD/GAC and PEI/CVD/GAC, respectively. The selectivity in the H2S/CH4 ratio of GAC is higher than zeolite 5A. The adsorption selectivity of the CO2/CH4 ratio of LiNO3/5A is higher than GAC.


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