AM‐4 is a layered porous titanosilicate built from TiO 6 and SiO 4 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, N 2 adsorption, FTIR, and UV/Vis characterization highlighting the delaminated character of UZAR‐S2, CO 2 adsorption was also measured.
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Casado‐Coterillo et al. (2011) studied this question.
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