固体超强酸SO42-/TiO2-Al2O3的制备及其催化合成冰片*

doi:10.11896/j.issn.1005-023X.2017.022.009

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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 SO₄^2-/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 SO₄^2-/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%.

Key words： SO₄^2-/TiO₂-Al₂O₃ solid superacid esterification borneol catalysis stability

Published: 08 May 2018

CLC number:

O624

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	Articles by authors
	WANG Helin
	JIANG Lihong
	WANG Yaming
	JIAO Xingxing
	PAN Deng

Cite this article:

WANG Helin,JIANG Lihong,WANG Yaming, et al. Preparation of SO₄^2-/TiO₂-Al₂O₃ Soild Superacid Catalyst and Its Catalytic Activity for Borneol Synthesis[J]. Materials Reports, 2017, 31(22): 43-49.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.022.009 OR http://www.mater-rep.com/EN/Y2017/V31/I22/43

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