AM‐4 is a layered porous titanosilicate built from TiO6 and SiO4 polyhedra. An improved synthesis of AM‐4 crystalsenabling control of particle size by secondary growth and reducing synthesis time is presented. A new material, UZAR‐S2, has been obtained by exfoliation of the smaller AM‐4. The exfoliation consists of proton exchange with acetic acid, intercalation with nonylamine, and final activation by washing with HCl/water/ethanol. Besides XRD, TEM, N2 adsorption, FTIR, and UV/Vis characterization highlighting the delaminated character of UZAR‐S2, CO2 adsorption was also measured.
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