Study On Isomerization Reaction Catalyzed By Solid Acids

In this dissertation, we stated the recent development of solid acid and the appliance of solid acid in isomerization reaction . We studied the isomerization of terpenic compounds such as p-pinene, limonene and turpentine catalysted by solid superacids, and the isomerization of endo-tetrahydrodicyclopentadiene catalysted by AlCl₃ catalyst and co-catalyst.Firstly, in the presence of solid superacid catalyst, the isomerization of p-pinene could proceed smoothly even at a normol pressure and relatively low temperature. Using S₂O₈^2-/ZrO₂ and S₂O₈^2-/TiO₂ catalyst, the effects of reaction temperature, reaction time and the use level of catalyst on the isomerization of p-pinene were discussed. In the end, we obtained the optimal reaction conditions for P-pinene isomerization. The reaction mechanism of P-pinene isomerization was discussed. The structures, particle size, surface area and the acidity of solid superacids were determined and analyzed by IR, TEM, BET, and acid indicator. The structures of the main products camphene were characterized by boiling point determination, IR, ¹H NMR, and ¹³C NMR spectra.Secondly, the isomerization of limonene was catalyzed by five kinds of solid superacids such as S₂O₈^2-/ZrO₂-La₂O₃, S₂O₈^2-/ZrO₂-Y₂O₃, S₂O₈^2-/ZrO₂-Dy₂O₃, S₂O₈^2-/ZrO₂-Nd₂O₃ and S₂O₈^2-/ZrO₂-Al₂O₃. It had been found that rare earth solid superacid S₂O₈^2-/ZrO₂-Y₂O₃ and solid superacid S₂O₈^2-/ZrO₂-Al₂O₃ had strong activity. The main conducts of limonene isomerization were α -terpinene and terpinolene. The effects of reaction time, reaction temperature, the mass percent of rare earth oxide Y₂O₃ and metal oxide Al₂O₃ in carrier, and the use level of catalyst on isomerization of limonene were discussed. In the end, the optimal conditions of limonene isomerization were obtained. The structures and the acidity of solid superacids were determined by IR and acid indicator. We also studied the reuse and the revivification of the catalyst S₂O₈^2-/ZrO₂-Y₂O₃ and S₂O₈^2-/ZrO₂-Al₂O₃.Thirdly, we researched the isomerizalion of turpentine in the presence of solid superacid. The effects of reaction temperature, reaction time and the use level of...