Oxygen-selective adsorption from air with a metal-organic framework featuring open copper sites

A method for removing N2 and O2 impurities in an argon gas stream, the method comprising:

• (a) providing a stream of argon gas with N2 and O2 impurities for separation;
• (b) adsorbing O2 and N2 from the stream of gases on a porous metal-organic framework (MOF) adsorbent, the framework comprising CuI-MFU-4l (CuXZn5-x(OCHO/Cl)4-x(btdd)3;
• H2btdd=bis(1H-1,2,3-triazolo[4,5-b],[4′,5′-i])dibenzo[1,4]dioxin);
• (c) collecting the purified Ar gas stream;
• (d) releasing the adsorbed O2 and N2 from the framework;
• and
• (e) recovering the released gases and regenerating the framework.

A method for efficient recovery of high-purity O2 from unpurified, ambient air, the method comprising:

• (a) providing a volume of ambient air for separation;
• (b) adsorbing O2 from the ambient air on a porous metal-organic framework (MOF) adsorbent, the framework comprising CuI-MFU-4l (CuXZn5-x(OCHO/Cl)4-x(btdd)3;
• H2btdd=bis(1H-1,2,3-triazolo[4,5-b],[4′,5′-i])dibenzo[1,4]dioxin);
• (c) releasing the adsorbed O2 from the framework;
• and
• (d) collecting the released a high-purity O2 gas.