Abstract
Au nanoparticles with different sizes were introduced into the nanocages of a mesoporous material SBA-16 with the aid of chemical modification, leading to new Au-supported catalysts Au/SBA-16. These catalysts were characterized with Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microspectroscopy (TEM), N2 sorption, and X-ray photoelectron microspectroscopy (XPS). These results revealed that uniform Au nanoparticles with sizes of a few nanometers were successfully positioned inside the nanocages of SBA-16. Such catalysts were catalytically active in the oxidative esterification of various alcohols even including less reactive straight-chain alcohols. It was found that the activity of this catalyst strongly depended on the Au loading, and the Au loading of 5 wt % (corresponding to Au particles of 2–3 nm in sizes) led to the highest activity. Its activity was much higher than those of the analogous catalysts prepared from commercial silica gel as well as SBA-...
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