Method for preparing a crystalline porous aluminum tetracarboxylate of mof type, and uses thereof

Abstract

The present invention relates to a method for synthesising a hybrid porous solid at ambient pressure consisting of a metal-organic framework (MOF) of aluminium carboxylates, of chemical formula {[Al4(OH)8(C10O8H2)]·xH2O}n wherein x≥0 and n greater than or equal to 5, comprising at least the following steps: (i) mixing in an aqueous solvent: a basic aluminium source or an acidic aluminium source, benzene-1,2,4,5-tetracarboxylic acid, optionally, when the aluminium source is basic, an acid, and when the aluminium source is acidic, a base, in a molar ratio of aluminium source/benzene-1,2,4,5-tetracarboxylic acid comprised between 2 and 8, (ii) heating the mixture obtained in (i) to a temperature comprised between 20 and 105° C., at a pressure of about 101 325 Pa. The present invention also relates to the use of the MOF of chemical formula {[Al4(OH)8(C10O8H2)]·xH2O}n (x≥0), in the separation/capture of molecules of size less than 5 Å, in particular in the separation of molecules governed (i) by specific interactions with the —OH, —CO2H and/or —CO2— groups present on the surface of the pores of said MOF and/or (ii) by size exclusion by promoting the selective adsorption of the molecules of sizes smaller than those of the pores of said MOF.

Dependencies are inferred from the claim text.