Highly Permeable AlPO-18 Membranes for N<sub>2</sub>/CH<sub>4</sub> Separation
Zhaowang Zong (2900066)Sameh K. Elsaidi (1322040)Praveen K. Thallapally (1370520)Moises A. Carreon (1489657)
Abstract
Herein\nwe demonstrate that AlPO-18 membranes can separate N<sub>2</sub>/CH<sub>4</sub> gas mixtures at unprecedented N<sub>2</sub> permeances. The\nbest membranes separated N<sub>2</sub>/CH<sub>4</sub> mixtures with\nN<sub>2</sub> permeances as high as 3076 GPU and separation\nselectivities as high as 4.6. Gas mixture separation data, N<sub>2</sub> and CH<sub>4</sub> adsorption isotherms, ideal adsorbed solution\ntheory (IAST), and breakthrough experiments were collected to understand\nthe separation mechanisms. Competitive adsorption and differences\nin diffusivities were identified as the prevailing separation mechanisms.\nDifferences in diffusivity played a more dominant role than the competitive\nadsorption, and led to nitrogen selective membranes.
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