Abstract
Hybrid three-dimensionally ordered macroporous (3DOM) SiO 2–SO 3H materials with different S/Si ratio have been prepared by colloidal crystal templating method. The process involved preparation of 3DOM SiO 2–SH materials by co-condensation of (3-mercaptopropyl)triethoxysilane and tetraethoxysilane via sol–gel transformation, and following oxidation of –SH group to –SO 3H group by H 2O 2. Materials were characterized by scanning electron microscopy (SEM), Fourier transform infra-red spectrometer (FTIR), thermogravimetric analysis (TGA), and nitrogen adsorption measurement. SEM observation shows that the macropores are highly ordered with a typical “surface-templated” structure. The surface area of 3DOM SiO 2–SH material is 25.1 m 2/g and SiO 2–SO 3H material is 18.6 m 2/g. Catalytic activity test shows that 3DOM SiO 2–SO 3H materials possess a high activity for the esterification of acetic acid and n-butanol, and the activity is increased with the amount of sulfur in the materials. This study provided significant results for developing new application of 3DOM materials.
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