Study On Isomerization Of Terpene Catalyzed By Solid Superacids

In this dissertation,We stated the recent development of solid su-peracids and the appliance of solid superacids in organic synthesis. We studied the isomerization of longifolene and a-Pinene catalysted over solid superacids. The changes of structure and profile and the acidity of solid superacids were mensurated and analysed by infrared spectrum (IR),X-ray diffraction(XRD),scan electric mirror(SEM) and Ther-mogravimetry(TG) .Firstly,Solid superacids were used to catalyze the isomerization of longifolene under certain temperature. The main product was isolongi-folene and the yield was very high. The effects of preparation methods,impregnation concentration,calcination temperature,reaction time and amount of solid superacids catalyst on catalytic activity of longifolene were studied. The optimal condition of preparation of catalyst and the optimal condition of isomerization were obtained.Secondly,Isomerization of a - pinene was catalyzed by five kinds of rare earth solid superacids SO42-/TiO2 - CeO2,SO42-/TiO2 - La2O3,SO42-/TiO2 - Nd2O3,SO42-/TiO2 - Sm2O3,SO42-/TiO2 - Gd2O3. SO42-/TiO2 - CeO2,SO42-/TiO2 - La2O3,SO42-/TiO2 - Nd2O3 catalysts had high activity and selectivity on a - pinene isomerization. The main product was camphene. During this experiment,The concentra-tion of rare earth ion,concentration of sulfurate acid etal were studied and we got the optimal condition of preparation of catalysts and the optimal condition of isomerization.Thirdly,The changes of structure and profile and the acidity of solid superacids were mensurated and analysed by IR,XRD,SEM and TG.We also explored the catalytic mechanism of solid superacids.