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Isomerization of Glucose to Fructose in Hydrolysates from Lignocellulosic Biomass Using Hydrotalcite

Steinbach, David; Klier, Andreas; Kruse, Andrea; Sauer, Jörg; Wild, Stefan; Zanker, Marina

Abstract:
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 wasperformedvia IR, XRD, and SEM. Firstly, glucose solutions at pH-neutral 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)2, 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. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120844
Veröffentlicht am 14.08.2020
Originalveröffentlichung
DOI: 10.3390/PR8060644
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.06.2020
Sprache Englisch
Identifikator ISSN: 2227-9717
KITopen-ID: 1000120844
HGF-Programm 35.13.02 (POF III, LK 01) Konversion
Erschienen in Processes
Verlag MDPI
Band 8
Heft 6
Seiten Article: 644
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 28.05.2020
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Scopus
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