Akademik Veri Yönetim Sistemi
Journal of the Iranian Chemical Society, cilt.23, sa.6, 2026 (SCI-Expanded, Scopus)
Tin incorporated SBA-15 catalysts were successfully synthesized under different synthesis conditions which were tin adding sequence (before and after TEOS), dissolving of tin in different alcohols (ethyl or isopropyl alcohol) and loading of with different Sn/Si molar ratios (0.03 and 0.09) under aluminum competition with Al/Si molar ratio of 0.001. Effects of synthesis conditions on the physicochemical properties were investigated. XRD results exhibited that while lattice parameter values of SBA-15 increased with tin loading, its adding sequence and isolating in alcohols generally did not change much. BET surface area, total pore volume and pore diameter values of SBA-15 increased from 800 m2/g, 1.14 cm3/g and 6.73 nm to 1027 m2/g, 1.49 cm3/g and 6.87 nm under metal dissolution in isopropyl alcohol and before TEOS addition. The surface area increase was greater with the addition of tin before TEOS for Sn/Si: 0.03 catalyst and after TEOS for Sn/Si: 0.09 catalyst. Both XRD patterns and XPS spectra showed that tin incorporated to SBA-15 in tin oxide form. The highest metal incorporation was obtained by adding TEOS after metal dissolution in ethyl alcohol by XPS and EDS analyses. SEM images showed typical SBA-15 structure. In FTIR spectra obtained via pyridine adsorption, it was observed that the peak intensities of acid sites and silanol groups in the structure increased with metal loading.