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Citation: ZHAO Qian-Rong, WU Chun-Hua, YAN Jun, ZHANG Guo-Ping, DU Xia. Isomerization of α-Pinene Catalyzed by Nanometer Composite S₂O₈^2-/SnO₂-TiO₂ Solid Superacid[J]. Chinese Journal of Applied Chemistry, ;2008, 25(2): 204-207. shu

Isomerization of α-Pinene Catalyzed by Nanometer Composite S₂O₈^2-/SnO₂-TiO₂ Solid Superacid

1.
a College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650092;
2.
b Faculty of Wood Science and Decoration Engineering, Southwest Forestry College, Kunming

Corresponding author: ZHAO Qian-Rong,
Received Date: 16 January 2007
Available Online: 31 May 2007
Fund Project: 国家自然科学基金(30700632) (30700632)云南省教育厅科研基金(5Y0091A) (5Y0091A)云南师范大学科研基金(KY2006-092) (KY2006-092)云南省自然科学基金(2006C0034Q)资助项目 (2006C0034Q)

Nanometer composite S₂O₈^2-/SnO₂-TiO₂,a novel solid superacid,was prepared by sol-gel method and its structure was characterized by XRD,TEM,FT-IR and BET surface area measurement.The composite S₂O₈^2-/SnO₂-TiO₂ had a narrow particle size distribution with an average diameter of about 15~20 nm.S₂O₈^2- was attached on the surface of SnO₂-TiO₂ so that its strong acid sites were formed.The surface area of the catalyst was obviously increased after the incorporation of SnO₂.Nanometer composite S₂O₈^2-/SnO₂-TiO₂ was used as a catalyst in α-pinene isomerization.The experimental results showed that the catalyst had better catalytic activity and selectivity.The main product of the isomerization reaction was camphene,and the by-products were limonene,terpinolene and tricyclene etc.Compared with ordinary S₂O₈^2-/TiO₂,the composite catalyst can lower the reaction temperature by 20~30℃ for the isomerization.Under suitable conditions,the conversion of α-pinene reached 98% and the selectivity of camphene reached 63%.
- solid superacid,
- S₂O₈^2-/SnO₂-TiO₂,
- nanometer particle,
- α-pinene,
- catalytic isomerization
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Isomerization of α-Pinene Catalyzed by Nanometer Composite S₂O₈^2-/SnO₂-TiO₂ Solid Superacid