NDLI: Catalytic activity and stability of hydrophobic Mg–Al hydrotalcites in the continuous aqueous-phase isomerization of glucose into fructose

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Catalysis Science & Technology Vol - 4 Issue - 9

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Catalytic activity and stability of hydrophobic Mg–Al hydrotalcites in the continuous aqueous-phase isomerization of glucose into fructose

Content Provider	Royal Society of Chemistry (RSC)
Author	Delidovich, I. Palkovits, R.
Copyright Year	2014
Abstract	The aqueous-phase isomerization of glucose into fructose, catalyzed by Mg–Al hydrotalcites, has been investigated under batch and continuous conditions. A commercial hydrotalcite with a hydrophobic surface modification and two hydrophilic hydrotalcites in carbonate form, or with OH− anions in the interlayer space, served as catalysts. With the hydrophobic hydrotalcite a lower conversion but superior selectivity to fructose could be demonstrated, reaching above 92% selectivity at 30% conversion. The observed by-products confirm retroaldolization of glucose and fructose as the main side reactions causing catalyst deactivation via adsorption. Additionally, acidic degradation products such as lactic acid cause neutralization of the hydrotalcites facilitating leaching of the Mg2+ ions. Fructose contributes a greater extent to by-product formation. Applying continuous operation conditions, fructose is removed from the reaction mixture. Therefore, by-product formation is notably suppressed and catalyst stability increases. During 70 to 100 h time-on-stream a slow deactivation of the hydrophobic hydrotalcite occurs. Regeneration can be achieved via calcination and treatment in an aqueous sodium n-dodecyl sulfate solution to introduce dodecyl sulfate anions to the interlayer space of the hydrotalcite, restoring the hydrophobic material properties.
Starting Page	4322
Ending Page	4329
Page Count	8
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	12
Journal	Catalysis Science & Technology
DOI	10.1039/c4cy00776j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrotalcite Acid Adsorption Sodium Lauric acid Isomerization Calcination Glucose Hydrophobe Hydrophile Fructose
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Catalytic activity and stability of hydrophobic Mg–Al hydrotalcites in the continuous aqueous-phase isomerization of glucose into fructose

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