Metal-organic frameworks for Xe/Kr separation

摘要

Metal-organic framework (MOF) materials are provided and are selectively adsorbent to xenon (Xe) over another noble gas such as krypton (Kr) and/or argon (Ar) as a result of having framework voids (pores) sized to this end. MOF materials having pores that are capable of accommodating a Xe atom but have a small enough pore size to receive no more than one Xe atom are desired to preferentially adsorb Xe over Kr in a multi-component (Xe—Kr mixture) adsorption method. The MOF material has 20% or more, preferably 40% or more, of the total pore volume in a pore size range of 0.45-0.75 nm which can selectively adsorb Xe over Kr in a multi-component Xe—Kr mixture over a pressure range of 0.01 to 1.0 MPa.

主权项

1. A method of separating Xe and another noble gas in a gas mixture, comprising contacting the gas mixture with an adsorbent material comprising a metal-organic framework (MOP) material wherein the MOF material has 20% or more of the total pore volume of a size to receive no more than one Xe atom for selectively adsorbing Xe from the gas mixture,
wherein selectivity of the MOF material for Xe from the gas mixture is about 9 to about 11 over a pressure range of 0.01 to 1.0 MPa at 273 K.