关键词: 碳基碳化硅, 核壳固体酸, 苯甲醛1,3-丙二醇缩醛, 催化合成

Abstract: The core-shell structure silicon carbide based carbon composite solid acid catalyst was prepared via gas sulfonation progress from SiC/C composites which was synthesized by hydrothermal method and low temperature carbonization at 400℃ using glucose, oleic acid and humic acid sodium as carbon source and silicon carbide as carrier. The catalyst was characterized by XRD, IR, XPS, TG, SEM and TEM. The result showed that the acid value of the solid acid catalyst measured by acid titration method was 1.33mmoL/g. Its catalytic activity was tested by the benzaldehyde and 1, 3-propanediol condensation reaction. Effects of molar ration of raw material, the amount of catalyst, reaction time and reusability of the catalyst on the condensation yield had been investigated. When 0.075g catalyst was used for 0.1 mol benzaldehyde and the molar ration of alcohol to aldehyde in the precursors was equal to 1.5 and the reflux condensation was kept for 2h at 100℃, the condensation yield was 83% and the catalyst could be reused for more than four times.

Key words: carbon-based silicon carbide, core-shell structure solid acid, benzaldehyde 1,3-propanediol acetal, catalysis synthesis