Abstract:

Acid activated and kaolinite supported SO2-4/ZrO2-TiO2 was prepared as a solid acid catalyst. The structure and acid strength of the catalyst was studied by FT-IR, XRD and NH3-TPD. The activity and stability of the catalyst for the synthesis of cyclohexanon ethylene ketal were investigated. The results showed that the acid amount of kaolinite was increased with increasing acid activation, and the acid strength was significantly enhanced after supporting SO2-4/ZrO2-TiO2 and calcinations at 500 ℃ for 3 h. When the molar ratio of cyclohexanone to ethylene is 1∶1.2, the loading of catalyst is 1.2 g and the volume of cyclohexane is 15 mL, the yield of cyclohexanone ethylene ketal from 0.2 mol cyclohexanon feed could reach 96.8% after 70 min reaction. The catalyst was used repeatedly for 5 times with the yield still larger than 90%.

Key words: kaolinite supported solid acid, catalyst, ketalation