Inverse CO 2 /C 2 H 2 separation assisted by coordinated water in a dysprosium(III) metal-organic framework.

An ultramicroporous metal-organic framework (MOF) constructed from dysprosium(III) and oxalate, termed Dy-F-oxa, is carefully studied for inverse separation of CO 2 from C 2 H 2 . Adsorption experiments and modeling studies reveal that the high CO 2 adsorption is attributed to the preferential sites for CO 2 by coordinated water. After the equimolar gas mixture breakthrough experiment, C 2 H 2 can be directly produced as a pure effluent.