Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite
The isomerization of glucose-containing hydrolysates to fructose is a key step in the process from lignocellulosic biomass to the platform chemical hydroxymethylfurfural. We investigated the isomerization reaction of glucose to fructose in water catalyzed by hydrotalcite. Catalyst characterization w...
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doaj-64e11b4ba127420fa2b206d4c3b9eb792020-11-25T03:26:41ZengMDPI AGProcesses2227-97172020-05-01864464410.3390/pr8060644Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using HydrotalciteDavid Steinbach0Andreas Klier1Andrea Kruse2Jörg Sauer3Stefan Wild4Marina Zanker5Karlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyKarlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyInstitute of Agricultural Engineering, University of Hohenheim, Garbenstrasse 9, 70599 Stuttgart, GermanyKarlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyKarlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyKarlsruhe Institute of Technology (KIT), Institute for Catalysis Research and Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyThe isomerization of glucose-containing hydrolysates to fructose is a key step in the process from lignocellulosic biomass to the platform chemical hydroxymethylfurfural. We investigated the isomerization reaction of glucose to fructose in water catalyzed by hydrotalcite. Catalyst characterization was performed via IR, XRD, and SEM. Firstly, glucose solutions at pHneutral conditions were converted under variation of the temperature, residence time, and catalyst loading, whereby a maximum of 25 wt.% fructose yield was obtained at a 38 wt.% glucose conversion. Secondly, isomerization was performed at pH = 2 using glucose solutions as well as glucose-containing hydrolysates from lignocellulosic biomass. Under acidic conditions, the hydrotalcite loses its activity for isomerization. Consequently, it is unavoidable to neutralize the acidic hydrolysate before the isomerization step with an inexpensive base. As a neutralizing agent NaOH is preferred over Ba(OH)<sub>2</sub>, since higher fructose yields are achieved with NaOH. Lastly, a pH-neutral hydrolysate from lignocellulose was subjected to isomerization, yielding 16 wt.% fructose at a 32 wt.% glucose conversion. This work targets the application of catalytic systems on real biomass-derived samples.https://www.mdpi.com/2227-9717/8/6/644glucosefructosealdose-ketose isomerizationpretreatmenthydrolyzatelignocellulose |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
David Steinbach Andreas Klier Andrea Kruse Jörg Sauer Stefan Wild Marina Zanker |
spellingShingle |
David Steinbach Andreas Klier Andrea Kruse Jörg Sauer Stefan Wild Marina Zanker Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite Processes glucose fructose aldose-ketose isomerization pretreatment hydrolyzate lignocellulose |
author_facet |
David Steinbach Andreas Klier Andrea Kruse Jörg Sauer Stefan Wild Marina Zanker |
author_sort |
David Steinbach |
title |
Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite |
title_short |
Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite |
title_full |
Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite |
title_fullStr |
Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite |
title_full_unstemmed |
Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite |
title_sort |
isomerization of glucose to fructose in hydrolysates from lignocellulosic biomass using hydrotalcite |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2020-05-01 |
description |
The isomerization of glucose-containing hydrolysates to fructose is a key step in the process from lignocellulosic biomass to the platform chemical hydroxymethylfurfural. We investigated the isomerization reaction of glucose to fructose in water catalyzed by hydrotalcite. Catalyst characterization was performed via IR, XRD, and SEM. Firstly, glucose solutions at pHneutral conditions were converted under variation of the temperature, residence time, and catalyst loading, whereby a maximum of 25 wt.% fructose yield was obtained at a 38 wt.% glucose conversion. Secondly, isomerization was performed at pH = 2 using glucose solutions as well as glucose-containing hydrolysates from lignocellulosic biomass. Under acidic conditions, the hydrotalcite loses its activity for isomerization. Consequently, it is unavoidable to neutralize the acidic hydrolysate before the isomerization step with an inexpensive base. As a neutralizing agent NaOH is preferred over Ba(OH)<sub>2</sub>, since higher fructose yields are achieved with NaOH. Lastly, a pH-neutral hydrolysate from lignocellulose was subjected to isomerization, yielding 16 wt.% fructose at a 32 wt.% glucose conversion. This work targets the application of catalytic systems on real biomass-derived samples. |
topic |
glucose fructose aldose-ketose isomerization pretreatment hydrolyzate lignocellulose |
url |
https://www.mdpi.com/2227-9717/8/6/644 |
work_keys_str_mv |
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