Preparation of SO42/ZrO2-γ-Al2O3 Solid Acid and its Catalytic Activity in Synthesis of Dioctyl Sebacate
SO42-/ZrO2-γ-Al203 solid acid catalyst was prepared by precipitation-impregnation method.The liquid phase esterification of sebacic acid and isooctyl alcohol was performed to confirm the optimal conditions of preparation.The results show that the optimum preparation conditions for solid acid catalyst through precipitation-impregnation method are calcination temperature is 600 ℃,the calcination time is 5 h,the sulfuric acid impregnation concentration is 0.6 mol/l,the sulfuric acid impregnation time is 9 h,and the aging temperature is-20℃.The conversion of sebacic acid amounts to 99.66％,and still remains 90.54％after recycling 5 times at the optimum conditions.
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