RESEARCH PAPER |
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Preparation of SO42-/TiO2-Al2O3 Soild Superacid Catalyst and Its Catalytic Activity for Borneol Synthesis |
WANG Helin, JIANG Lihong, WANG Yaming, JIAO Xingxing, PAN Deng
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Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500 |
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Abstract A series of sulphated Al2O3-TiO2 mixed oxides were prepared by sol-gel and dipping process and used as catalysts in synthesis of borneol. The structure and properties of SO42-/TiO2-Al2O3 solid superacid catalysts were characterized by XRD, NH3-TPD, FT-IR, Py-FTIR, XPS, SEM techniques, and relationship between the catalytic performance and the structure was explored. The optimal condition for the preparation of the catalyst was obtained as follows: n(TiO2)/n(Al2O3)=1∶2, concentration of impregnation 1 mol/L, calcination temperature of the catalysts 500 ℃. Meanwhile, the effects of the dosage of level of catalyst, molar ratio of α-pinene to oxalic acid, reaction time on borneol synthesis reaction was investigated. The results showed that when the dosage of level of catalyst was 6% and molar ratio of α-pinene to oxalic acid was 1∶0.4, by using the program temperature heating method (65 ℃-1 h, 75 ℃-4 h, 90 ℃-1 h), i.e. the optimized condition, the resultant solid superacid SO42-/TiO2-Al2O3 catalyst performed the best catalytic effect to borneol synthesis reaction, as α-pinene was completely converted and high selectivity of borneol (58.63% yield) was achieved. After 6 times reuse, the catalyst still maintained good performance—α-pinene conversion rate unchanged, yield of borneol decreased by 2.99%.
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Published:
Online: 2018-05-08
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