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Selective hydrogenolysis of glycerol over copper catalysts both in liquid and vapour phase: Correlation between the copper surface area and the catalyst's activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
41633 45895 2011 5 PDF Available
Title
Selective hydrogenolysis of glycerol over copper catalysts both in liquid and vapour phase: Correlation between the copper surface area and the catalyst's activity
Abstract

The hydrogenolysis of glycerol was performed both in liquid and in vapour phase by the use of different copper catalysts. The reactions in liquid phase were carried out using copper catalysts which differ in their copper content (36–89 wt.%) and, thus, in their composition while for the hydrogenolysis of glycerol in the vapour phase a set of different silica supported copper catalysts (Cu/SiO2, low copper loading) was prepared either by incipient wetness (IW) or by ion exchange technique (IE).Concerning the reactions in the vapour phase complete conversion of glycerol and a selectivity to 1,2-propanediol of 87% was achieved over a Cu/SiO2_IE catalyst under optimised reaction conditions (255 °C, 15 bar, 300 ml/min H2). In liquid phase hydrogenation, 1,2-propanediol was nearly the sole product (selectivity = 98%), and conversions up to 52% were obtained according to a space–time–yield of 5.9 g1,2-propanediol/(gCu h).N2O chemisorption was carried out in order to determine the specific copper surface area of the catalysts. For both the reaction in liquid phase and in vapour phase there is a linear relationship between the specific copper surface area and the catalytic activity not only for glycerol hydrogenolysis, but also for glycerol dehydration to acetol and the subsequent hydrogenation of the latter to 1,2-propanediol.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (31 K)Download as PowerPoint slideResearch highlights▶ The hydrogenolysis of glycerol, a two-step reaction via glycerol dehydration to acetol with subsequent hydrogenation to 1,2-propandiol, was performed both in liquid and vapour phase using a set of different copper catalysts. ▶ In the vapour phase complete conversion of glycerol and a selectivity to 1,2-propanediol of 87% was achieved over a Cu/SiO2 catalyst (SCu = 3.9 m2/g) under optimised reaction conditions. ▶ A plot of the Turnover Number versus the specific copper surface area reveals a linear relationship between these two values regardless of the aggregate state of glycerol during the reaction.

Keywords
Glycerol hydrogenolysis; 1,2-Propanediol; Acetol hydrogenation; Copper catalysts; Copper surface area
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Selective hydrogenolysis of glycerol over copper catalysts both in liquid and vapour phase: Correlation between the copper surface area and the catalyst's activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 153–157
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