# US 8,784,536 B2 · Metal-organic frameworks for Xe/Kr separation

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- Number: US 8,784,536 B2
- Document ID: US8784536B2
- Status: Granted
- Kind: B2
- Application number: 13/974,406
- Filed: 2013-08-23
- Published: 2014-01-16
- Granted: 2014-07-22
- Earliest claimed: 2010-08-19
- Assignees: Northwestern University
- Applicants: Northwestern University
- Inventors: Patrick J. Ryan; Omar K. Farha; Linda J. Broadbelt; Randall Q. Snurr; Youn-Sang Bae
- Web page: https://patentgrep.com/patent/US8784536B2

## CPC

- B01J 20/226: {Coordination polymers, e.g. metal-organic frameworks [MOF], zeolitic imidazolate frameworks [ZIF] (preparation of metal complexes containing carboxylic acid moieties C07C51/418; MOF's per se C07F)}
- B01D 53/02: by adsorption, e.g. preparative gas chromatography {(solid sorbent compositions B01J20/00, preparation of inorganic compounds or elements C01)}
- B01J 20/2808: {being less than 2 nm, i.e. micropores or nanopores}
- B01J 20/28088: {Pore-size distribution}
- C07F 1/005: {without C-Metal linkages}
- B01D 2253/204: Metal organic frameworks (MOF's)
- B01D 2253/308: Pore size
- B01D 2256/18: Noble gases
- B01D 2257/11: Noble gases
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The method of claim 1 wherein the MOF material has 40% or more of the total pore volume in a pore size range of 0.45-0.75 nm.

### Claim 3 (depends on 1)

The method of claim 1 wherein the MOF material has carboxylate linkers.

### Claim 4 (depends on 1)

The method of claim 1 wherein the other noble gas is selected from the group consisting of Kr and Ar.

### Claim 5

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 (MOF) 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 the MOF material exhibits a selectivity for Xe from the gas mixture of about 9 and 11 over a pressure range of 0.01 to 1.0 MPa at 273 K.