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1. A metal-impregnated metal-organic framework (MOF) composition comprising a MOF comprising corner metal units comprising metal ion atoms where the metal (M) is selected from Zr, V, Al, Fe, Cr, Ti, Hf, Cu, Zn, Ni, Hf, In, Ce, and mixtures thereof and linker molecules connecting metal ion corner atoms, the linker molecules selected from at least one organic ligand containing an aryl amino group or a combination of at least one organic ligand containing an aryl amino group and at least one organic ligand that does not contain an aryl amino group, and an inorganic metal (M′) salt impregnated onto the MOF, wherein the metal (M′) is selected from Li, Na, K, Mg, Ca, Sr, Ba, Mn, Sc, Y, Ti, Zr, Hf, V, Cr, Mo, W, Fe, Co, Ni, Cu, Ag, Zn, Cd, Al, Ga, In, Sn, Pb and mixtures thereof, the metal-impregnated MOF composition characterized in that it has a static ammonia capacity of at least 4 mmol/g measured at 10 Torr at 25° C. and substantially retains its capacity for acidic TICs.
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