CO₂ adsorption performance of ZIF-7 and its endurance in flue gas components

Abstract

Porous ZIF-7 with the sodalite (SOD) cage structure (ZIF, Zeolitic imidazolate framework) were synthesized by the solvothermal method. Synthesized material was characterized by powder X-ray diffraction (PXRD), thermal gravity (TG), scanning electron microscopy (SEM) and N₂ adsorption analysis. ZIF-8 with the SOD structure and a little larger pore window was synthesized in a similar way and was characterized for comparisons. Thermal stability and structural stability of ZIF-7 were tested through PXRD analysis, and the capability of the material for CO₂ capture from simulated flue gas was investigated through physical adsorption method. The results showed that CO₂ adsorption capacity on ZIF-7 was about 48 mL·g^-1 while the capacity on ZIF-8 was about 18 mg·g^-1 (at 12°C and 0.98 P/P₀ relative pressure). Furthermore, the impact of flue gas components on adsorption capacity of ZIF-7 and the selectivity of CO₂ against N₂ on ZIF-7 was also investigated in this work.

Keywords

ZIF-7 / structural stability / CO₂ capture / thermal stability

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