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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

Bienholz, Arne and Hofmann, Heiko Jürgen and Claus, Peter (2011):
Selective hydrogenolysis of glycerol over copper catalysts both in liquid and vapour phase: Correlation between the copper surface area and the catalyst’s activity.
In: Applied Catalysis A: General, pp. 153-157, 391, (1-2), [Online-Edition: http://dx.doi.org/10.1016/j.apcata.2010.08.047],
[Article]

Abstract

he 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.

Item Type: Article
Erschienen: 2011
Creators: Bienholz, Arne and Hofmann, Heiko Jürgen and Claus, Peter
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
Language: English
Abstract:

he 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.

Journal or Publication Title: Applied Catalysis A: General
Volume: 391
Number: 1-2
Divisions: 07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie II
07 Department of Chemistry > Fachgebiet Technische Chemie
07 Department of Chemistry
Date Deposited: 18 Oct 2010 13:51
Official URL: http://dx.doi.org/10.1016/j.apcata.2010.08.047
Identification Number: doi:10.1016/j.apcata.2010.08.047
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