fulltext.study @t Gmail

Hydrodeoxygenation of aldehydes catalyzed by supported palladium catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
43424 45969 2007 9 PDF Available
Title
Hydrodeoxygenation of aldehydes catalyzed by supported palladium catalysts
Abstract

This contribution focuses on the hydrogenation and hydrodeoxygenation of aldehydes (benzaldehyde, 2-phenylpropionaldehyde, 3-phenylpropionaldehyde, cinnamaldehyde, 4-isopropylbenzaldehyde, heptanal) on supported palladium catalysts, namely zeolites and active carbon. The effects of the substrate structure, solvent, type of support and its acidity, reaction temperature and pressure on activity and selectivity of Pd catalysts were investigated in detail. Catalytic hydrodeoxygenation of aldehydes was carried out in a liquid phase in an autoclave in the temperature range from 30 to 130 °C and at pressure ranging from 1 to 6 MPa. Hydrogenation reactions performed in non-polar hexane proceeded with a significantly higher rate than in a polar methanol. The presence of isopropyl substituent in 4-isopropylbenzaldehyde increased both the reaction rate as well as the selectivity to hydrodeoxygenation. Hydrodeoxygenation of 2-phenylpropionaldehyde, 3-phenylpropionaldehyde, cinnamaldehyde, and heptanal did not proceed, the main products were dialkylethers, which evidences the importance of the direct attachment of CO group to the benzene ring. The presence of hydrogenation—hydrogenolytic mechanism as well as the direct hydrogenolysis of CO bond in the transformation of benzaldehyde was verified.

Graphical abstractHydrogenation and hydrodeoxygenation of aldehydes, especially benzaldehyde, proceed on supported palladium catalysts with zeolites and active carbon as supports. Zeolites beta were the most suitable supports for this reaction.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Hydrogenation; Hydrodeoxygenation; Benzaldehyde; Cinnamaldehyde; Phenylpropionaldehyde; Pd supported catalysts; Zeolites; Pd carbon catalyst
First Page Preview
Hydrodeoxygenation of aldehydes catalyzed by supported palladium catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 332, Issue 1, 1 November 2007, Pages 56–64
Authors
, , , , ,
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