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Support and solvent effects on the liquid-phase chemoselective hydrogenation of crotonaldehyde over Pt catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
41983 45906 2010 11 PDF Available
Title
Support and solvent effects on the liquid-phase chemoselective hydrogenation of crotonaldehyde over Pt catalysts
Abstract

A study of the selective reduction of crotonaldehyde to crotyl alcohol over Pt catalysts supported on various partially reducible solids including Fe2O3, Fe3O4, ZrO2, ZnO, TiO2 and SnO2 was conducted. The catalysts were characterized by thermal programmed reduction (TPR) and reduced at temperatures that were selected as a function of the presence of specific reduction peaks for Pt in the TPR profiles. The reduced catalysts were studied by XRD spectroscopy and TEM, and used for the liquid-phase hydrogenation of crotonaldehyde. As a rule, low reduction temperatures led to catalysts providing high yields in the unsaturated alcohol (2-butenol). Such yields were substantially increased by the addition of water in mixtures with dioxane to the medium, whether the medium was acid, neutral or basic. The highest selectivity towards crotyl alcohol was obtained with the solid Pt/ZnO reduced at 175 °C. This may have resulted from the presence of ZnOxCly species forming around Pt particles, which were detected by XPS and might have acted as Lewis acid sites facilitating anchoring of crotonaldehyde via its carbonyl double bond. The optimum working conditions, which included a reaction temperature of 30 °C and an initial hydrogen pressure of 0.414 MPa, afforded a selectivity higher than 90% for crotyl alcohol at conversions in the region of 40%.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (75 K)Download as PowerPoint slideResearch highlights▶ Selective hydrogenation of crotonaldehyde to crotyl alcohol over Pt catalysts supported on partially reducible supports was conducted. ▶ Low reduction temperatures provided catalysts leading to high yields in crotyl alcohol. ▶ The highest selectivity towards crotyl alcohol was obtained with the solid Pt/ZnO reduced at 175 °C. ▶ Yields to crotyl alcohol were increased by the addition of water in mixtures with dioxane to the medium. ▶ At optimum working conditions selectivity higher than 90% for crotyl alcohol was obtained at 40% conversion.

Keywords
Pt catalyst; Chemoselective crotonaldehyde hydrogenation; Crotyl alcohol selectivity; Solvent effect; Catalyst reduction temperature effect
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Support and solvent effects on the liquid-phase chemoselective hydrogenation of crotonaldehyde over Pt catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 385, Issues 1–2, 15 September 2010, Pages 190–200
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