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Epoxidation of bulky organic molecules over pillared titanosilicates

Paper ID Volume ID Publish Year Pages File Format Full-Text
54366 47007 2015 7 PDF Available
Title
Epoxidation of bulky organic molecules over pillared titanosilicates
Abstract

•A pillared TS-1 catalyst was prepared from nanosheet TS-1.•Addition of titanium to the pillaring mixture improves the catalyst performance.•The pillared TS-1 catalyses the epoxidation of terpenes.•Selective oxidation of verbenol to verbenone was observed.

Layered and pillared TS-1 catalysts were prepared using surfactant C18H37–N+(CH3)2C6H12–N+(CH3)2C6H13 in the hydroxide form as a structure directing agent and silicon(IV) ethoxide or its mixture with titanium(IV) butoxide as a pillaring medium. The pillaring treatment significantly increases the specific surface area (BET up to 685 m2/g) and thus the accessibility of active centres for bulky molecules. The addition of tetrabutylorthotitanate into the pillaring mixture has a positive effect on the material performance as a catalyst of cyclooctene, norbornene and α-pinene epoxidation under mild conditions, with hydrogen peroxide as the oxidant. Optimum composition of the pillaring medium is Si/Ti ratio 20. The highest yields of cyclooctene oxide (16.9% after 4 h) and norbonene oxide (14.8% after 4.5 h) were obtained using the above-prepared catalyst at 60 °C with substrate/catalyst mass ratio being 10 and substrate/H2O2 ratio being 2. Selective oxidation of verbenol to verbenone was observed instead of the epoxidation with the above catalysts.

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Keywords
Layered TS-1 zeolite; Pillaring; Epoxidation; Cyclooctene; Norbornene; Verbenol.
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Epoxidation of bulky organic molecules over pillared titanosilicates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 243, 1 April 2015, Pages 134–140
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us