Highly Stable Al-Mof Based on Pore Size Control Strategy for Efficient Sf6/N2 Separation

Abstract

SF6 has been widely used as an insulating medium, but it can also cause serious greenhouse effect. The efficient separation of SF6 is very important and challenging. A stable and scalable synthesis Al-MOF (MOF-303) is reported in the present work, which possesses an appropriate pore size (6.79 Å) that matches the dynamic diameter of SF6 molecules (5.2 Å). MOF-303 shows a higher adsorption capacity of SF6 (49.70 cm3/g) at low pressure (10 kPa) and ambient temperature, and the excellent adsorption selectivity of SF6/N2 (10:90) achieves 183.37 at ambient conditions. Meanwhile, breakthrough experiments exhibit that MOF-303 can efficiently separate high purify SF6 form SF6/N2 mixtures at ambient conditions. The relevant experimental conclusions have been further verified by theoretical calculations. The stronger binding energy between MOF-303 and SF6 molecule is responsible for the efficient SF6 adsorption and separation. The results will contribute to the design and search for efficient and practical new gas separation materials.

Keywords: Al-MOF, SF6 separation, IAST selectivity, Breakthrough experiment