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α-Pinene isomerisation over heteropoly acid catalysts in the gas-phase

Paper ID Volume ID Publish Year Pages File Format Full-Text
41544 45892 2010 6 PDF Available
Title
α-Pinene isomerisation over heteropoly acid catalysts in the gas-phase
Abstract

The isomerisation of α-pinene was studied in the gas phase over solid heteropoly acid (HPA) catalysts in a fixed-bed continuous flow reactor at 200 °C and ambient pressure. The catalysts included bulk and SiO2-supported H3PW12O40 and bulk Cs2.5H0.5PW12O40 possessing strong Brønsted acid sites, as well as composites prepared by supporting 15 wt% H3PW12O40 on Nb2O5, ZrO2 and TiO2 possessing both Brønsted and Lewis acid sites of moderate strength. The reaction yielded camphene as the main product in a mixture with monoterpene by-products such as limonene, terpinolenes, terpinenes, β-pinene, p-cymene and others. The HPA catalysts with strong Brønsted acid sites exhibited high initial activities, but suffered from catalyst deactivation, resulting in low camphene yields. Conversely, the HPA catalysts supported on Nb2O5, ZrO2 and TiO2, although weaker acids, showed more stable performance in α-pinene isomerisation. The HPA catalyst supported on TiO2 gave a camphene yield of 51% and a total camphene and limonene yield of 58%.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (95 K)Download as PowerPoint slideResearch highlights▶ The isomerisation of α-pinene, yielding camphene as the main product, was studied in the gas phase over solid heteropoly acid (HPA) catalysts in a fixed-bed continuous flow reactor at 200 °C and ambient pressure. ▶ Bulk and SiO2-supported H3PW12O40 and bulk Cs2.5H0.5PW12O40 possessing strong Brønsted acid sites exhibited high initial activities, but suffered from catalyst deactivation, resulting in low camphene yields. ▶ HPA catalysts supported on Nb2O5, ZrO2 and TiO2, possessing weaker Brønsted and Lewis acid sites, showed more stable performance in α-pinene isomerisation, with the HPA/TiO2 giving a camphene yield of 51% and a total camphene and limonene yield of 58%.

Keywords
Heterogeneous acid catalysis; Heteropoly acid; α-Pinene isomerisation
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α-Pinene isomerisation over heteropoly acid catalysts in the gas-phase
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 219–224
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
Online Support
Any Questions? feel free to contact us