Modified Versions of AM-4 for the Aqueous Phase Isomerization of Aldo-Saccharides

authors	Antunes, MM; Fernandes, A; Ribeiro, MF; Lin, Z; Valente, AA
nationality	International
journal	EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
author keywords	AM-4; Ion exchange; Base properties; Heterogeneous catalysis; Saccharide isomerization
keywords	LACTIC-ACID DERIVATIVES; GLUCOSE ISOMERIZATION; ALKALINE-DEGRADATION; CARBON-DIOXIDE; SN-BETA; CELLOBIOSE DECOMPOSITION; LAYERED TITANOSILICATES; LIGNOCELLULOSIC BIOMASS; HYDROTHERMAL SYNTHESIS; XYLOSE ISOMERIZATION
abstract	The isomerization of aldo-saccharides to keto-saccharides is an important transformation in biomass conversion processes. The use of eco-friendly heterogeneous catalysts for these reactions is most attractive, albeit good catalytic stability continues a challenge. The as-synthesized Aveiro-Manchester material number 4 (AM-4, Na-3(Na,H)Ti2O2[Si2O6](2),2H(2)O) possessed isomerization activity, but limited stability. This versatile precursor material was modified to meet superior performances in the base-catalyzed isomerization of the monosaccharides d-glucose and d-xylose, and the disaccharide d-cellobiose, at 100 degrees C. Different alkali and alkaline-earth metals were introduced into AM-4, which influenced the catalytic properties. The Mg-containing material was the most stable, leading to 27 % fructose yield from d-glucose, 41 % cellobiulose from d-cellobiose and 39 % xylulose from d-xylose isomerization, at 2 h reaction.
publisher	WILEY-V C H VERLAG GMBH
issn	1434-1948
isbn	1099-0682
year published	2020
volume	2020
issue	17
beginning page	1579
ending page	1588
digital object identifier (doi)	10.1002/ejic.202000038
web of science category	Chemistry, Inorganic & Nuclear
subject category	Chemistry
unique article identifier	WOS:000525896500001