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CO 2 and N 2 adsorption and separation using aminated UiO-66 and Cu 3 (BTC) 2 : A comparative study
Korean Journal of Chemical Engineering ( IF 2.476 ) Pub Date : 2020-03-03 , DOI: 10.1007/s11814-019-0433-5
Kasra Pirzadeh; Kourosh Esfandiari; Ali Asghar Ghoreyshi; Mostafa Rahimnejad

UiO-66 and Cu3(BTC)2, two well-known metal organic frameworks (MOFs), were aminated through insitu modification approach to improve CO2/N2 separation. UiO-66 was synthesized by solvothermal method, while Cu3(BTC)2 was synthesized with two electrochemical and solvothermal approaches for the sake of comparison. NH2-UiO-66 structure was optimized by evaluating the effect of key parameters, such as synthesis temperature, ligand to metal salt molar ratio, and modulator to metal salt molar ratio, on CO2/N2 selectivity. The effect of different weight percentage of 2-aminoterephthalic acid (NH2-BDC) on electrochemical synthesis of NH2-Cu3(BTC)2 was also investigated. Products were characterized by FTIR, BET, FESEM, XRD, and TGA analyses. Single CO2 adsorption experiment for NH2-UiO-66 showed higher capacity compared to UiO-66. However, for NH2-Cu3(BTC)2, an opposite trend was observed. The CO2 adsorption capacity for NH2-UiO-66 and NH2-Cu3(BTC)2 at 1 bar and 25 °C was 3.32 and 3.86 mmol/g, respectively. CO2/N2 selectivity with fixed concentration ratio (15/85 vol%) was also studied for aminated samples, and the values of 120 and 53 were determined for NH2-UiO-66 and NH2-Cu3(BTC)2, respectively. NH2-Cu3(BTC)2 showed the highest isosteric heat of adsorption among all samples (43 kJ/mol).
更新日期:2020-03-03

 

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