Isomerization of D-glucose to D-fructose over metallosilicate solid bases
authors Lima, S; Dias, AS; Lin, Z; Brandao, P; Ferreira, P; Pillinger, M; Rocha, J; Calvino-Casilda, V; Valente, AA
nationality International
journal APPLIED CATALYSIS A-GENERAL
author keywords glucose; fructose; isomerization; solid bases; metallosilicates; alkali metals; titanium; yttrium
keywords MICROPOROUS TITANOSILICATE ETS-10; STRUCTURAL-CHARACTERIZATION; BASIC SITES; 473 K; CATALYSTS; ISOMERASE; HYDROTALCITES; CONDENSATION; EXCHANGE; ACID
abstract The isomerization of glucose was studied in water at 100 degrees C in the presence of various metallosilicates as solid base catalysts, namely the titanosilicates ETS-10, ETS-4 and AM-4, a sodium yttrium silicate analogue of the mineral montregianite (AV-1), an alkali calcium silicate analogue of the mineral rhodesite (AV-2), and a calcium silicate analogue of the mineral tobermorite (TOB). Fructose yields in the range of 20-40% were obtained within 2-h reaction. These results are either similar to or better than those achievable with the commercial zeolite Na-X or aqueous NaOH. Depending on the nature of the catalyst, different factors account for deactivation, such as loss of crystallinity, sodium/potassium leaching and surface passivation. Two of the more promising materials, AV-1 and TOB, were quite stable under the reaction conditions, as evidenced by powder X-ray diffraction analyses for the fresh and used catalysts. The used TOB catalyst exhibited a steady performance when recycled and for AV-1 fructose yields increased in recycling runs. The activity of the solid bases, with the exception of AV-1, could be correlated with the basicity characterized by Knoevenagel condensation tests. (c) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0926-860X
year published 2008
volume 339
issue 1
beginning page 21
ending page 27
digital object identifier (doi) 10.1016/j.apcata.2007.12.030
web of science category Chemistry, Physical; Environmental Sciences
subject category Chemistry; Environmental Sciences & Ecology
unique article identifier WOS:000255455300003
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