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- 저자 : Atakan Toprak (검색결과 2 건)
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Atakan Toprak,Baki Hazer 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Carbon materials with economic and high adsorption capacity attract much attention to reducing fossilfuel and industrial CO2 emissions. For this purpose, porous hollow spheres with high surface area andmicropore volume, morphologically resembling fullerene or soccer balls, were first produced from thesynthesized polystyrene by hydrothermal and conventional activation. The highest micropore volumeand BET surface area were found in PS-hydroHCl with 0.61 cm3/g and 1481 m2/g, respectively. TheCO2 adsorption capacities of PS-hydroHCl at 0 and 25 C were relatively high and were obtained as6.25 and 3.62 mmol/g, respectively. It was determined that all microporous spheres were influential inthe isosteric heat of adsorption range of 17–26 kJ/mol, that is, typical CO2 physical adsorption. It has beenfound that hydrothermally synthesized PS-hydro and PS-hydroHCl contain higher amounts of oxygenthan PS and PSHCl produced according to the conventional method. In addition, CO2/N2 selectivity at25 C, PS-hydroHCl, was three times more effective than PSHCl. As a result, it can be said that the synthesisof porous hollow microspheres is simple, and the starting material (polystyrene) is cheap and abundant;high CO2 adsorption and effective CO2/N2 selectivity will be promising for industrial applications.
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Turkan Kopac,Atakan Toprak 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
Hydrogen sorption characteristics of activated carbons (ACs) produced by physical and chemical activations from two coal mines (Kilimli and Armutcuk) in the Zonguldak region, Turkey were investigated by a volumetric technique at 77 K. H2 adsorption isotherms were obtained on the samples exposed to pyrolytic thermal treatments in a temperature range of 600-900℃ under N2 flow and chemical activation using different chemical agents such as KOH, NH4Cl, ZnCl2 from the two mines. Experimental hydrogen adsorption isotherm data at 77 K were used for the evaluation of the adsorption isotherm constants of the Brunauer-Emmett-Teller (BET) and the Langmuir models, and also the amount of hydrogen adsorbed on the various samples was evaluated by using the adsorption isotherm data. Higher hydrogen adsorption capacity values were obtained for all the heat and the chemically treated activated carbon samples from the Kilimli coal samples than Armutcuk. The amount of H2 adsorbed on the original Kilimli coal samples was 0.020 wt%, and it was increased to 0.89 wt% on the samples pyrolyzed at 800℃. The highest value of hydrogen adsorption obtained was 1.2 wt% for the samples treated with KOH+NH4Cl mixture at 750℃ followed by oxidation with ZnCl2. It was shown that chemical activations were much more effective than physical activations in increasing the surface area, pore volume and the hydrogen sorption capacities of the samples.
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