METHOD FOR PRODUCING A THREE-DIMENSIONAL POROUS SORBENT STRUCTURE

The present invention relates to a method for producing a 3D porous sorbent structure, comprising building a 3D porous green body from a build material comprising an inorganic porous sorbent material and an organic binder material at least partially dissolved in a solvent, wherein the build material is deposited as filaments in a plurality of stacked layers to obtain the 3D porous green body, wherein at least some of the filaments within at least one of the plurality of layers are spaced apart from one another; inducing phase inversion of the 3D porous green body by exposing it to a non-solvent for the organic binder material, thereby obtaining a solidified 3D porous green body; drying the solidified 3D porous green body, thereby obtaining the 3D porous sorbent structure; wherein the build material comprises between 30 % and 70 % by weight of the inorganic porous sorbent material and between 5 % and 30 % by weight of the organic binder material, based on the total weight of the build material, the organic binder material is at least partially retained in the 3D porous sorbent structure, and the 3D porous sorbent structure has a sorbent accessibility of at least 40%, wherein the sorbent accessibility is calculated according to formula (I) sorbentaccessibility%=100∗SBET,structureX∗SBET,sorbent wherein SBET,structure is the BET surface area of the 3D porous sorbent structure, SBET,sorbent is the BET surface area of the initial inorganic porous sorbent material, X is the percentage in weight of the inorganic porous sorbent material, based on the total weight of the 3D porous sorbent structure, wherein the BET surface areas of the initial inorganic porous sorbent material and of the 3D porous sorbent structure are determined from argon adsorption isotherms at 87 K.