Incorporation of tin in different types of pores in SBA-15: Synthesis, characterization and catalytic activity

摘要: Abstract Mesoporous Sn-SBA-15 has been synthesized by three different methods such as conventional hydrothermal route, using cocatalyst NH4F and in the presence of organosilane precursor. All materials are thoroughly characterized powder X-ray diffraction (XRD), SEM, TEM, N2 sorption surface area measurements, diffuse-reflectance UV–visible FTIR spectroscopy, TG–DTA elemental analysis through ICP. Nitrogen adsorption data, XRD patterns, TEM observations suggests that textural properties retained during isomorphous substitution silicon tin. ICP chemical indicates tin can be substituted range Si/Sn = 69–162. spectra samples cocatalytic approach exhibit unique absorption band at 213 nm characteristics atom smaller pores (2–3 nm) located inside walls mesopores. Further, an additional 224 nm assigned to Sn atoms distorted tetrahedral position along primary In contrary, only one centered is observed for all well 19F NMR confirmed (no signal) absence occluded F− ions made with NH4F. Observed high catalytic activity Baeyer–Villiger oxidation Meerwin–Pondorf–Verly reduction under liquid-phase conditions suggest incorporation a portion method.