Direct synthesis without addition of acid of Al-SBA-15 with controllable porosity and high hydrothermal stability

Plug precursor assisted synthesis: A highly efficient method of tuning the acidic and structural properties of Al-SBA-15

“…The pore volume of samples S11 and S12 was measured to be 0.65 and 0.67 cm 3 /g, respectively, similar to that of sample S4 (0.61 cm 3 /g). Thanks to the high stability of the Al-SBA-15 synthesized from the acid-free medium [36], the penetration of aluminosilicate plug precursors did not destroy the hexagonal symmetry of the raw material, a conclusion that is directly supported by the typical H1-type hysteresis loop (Fig. 7B) and the narrow pore size distribution with a diameter of 7.6 nm for samples S11 and S12 (SI Fig.…”

“…Al-SBA-15 was synthesized following the method reported previously [17,18,36]. The samples were synthesized from the reaction mixtures with P123/Si molar ratios of 0.015 (S1), 0.010 (S2), 0.0075 (S3), and 0.0020 (S4).…”

Short-channeled mesoporous Zr–Al-SBA-15 as a highly efficient catalyst for hydroxyalkylation of phenol with formaldehyde to bisphenol F

“…M41S mesoporous silicas have larger pore diameter than zeolites and showed better catalytic activity for bisphenol F synthesis, however, the activity and reusability of these catalysts were still not satisfactory because the restricted diffusion of bulky condensation products from the mesoporous channel may result in the pore blockage and hence the deactivation of the catalyst occurs [9]. Thus, it is of great practical importance to develop more active and reusable porous acid catalysts for hydroxyalkylation of phenol to bisphenol F. SBA-15, a new type of ordered mesoporous silicas, is a particularly desirable candidate for the synthesis of bulky molecules due to the wider pore size and considerably thicker pore walls than MCM-41, as well as the improved thermal and hydrothermal stability [28][29][30]. However, the length of the channeling pores of SBA-15 is usually in the scale of micrometers.…”

Effect of Aluminum Incorporation into Mesoporous Aluminosilicate Framework on Drug Release Kinetics

“…The Al-containing SBA-15 support, denoted as AlSBA-15, was synthesized in acid-free conditions [37], by a slight modification of the procedure reported in [38] ∘ C and constant magnetic stirring rate of 150 rpm. A quantity of drug-loaded samples containing 10 mg MTP was added to a dialysis bag (cellulose tubing with average molecular weight cutoff 12000 Da, Sigma-Aldrich) together with 1 mL PBS, sealed, and then immersed in 90 mL release medium.…”