Dehydration of Glucose to 5-Hydroxymethylfurfural Using LaOCl/Nb.sub.2O.sub.5 Catalysts in Hot Compressed Water Conditions

• Published in: Catalysis letters Vol. 147; no. 7; pp. 1765 - 1774
• Main Authors: Martínez, José J, Silva, David F, Aguilera, Edna X, Rojas, Hugo A, Brijaldo, María H, Passos, Fabio B, Romanelli, Gustavo P
• Format: Journal Article
• Language: English
• Published: Springer 01.07.2017
• Subjects: Adsorption; Analysis; Catalysts; Fructose; Glucose; Pyridine
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1007/s10562-017-2064-y

The dehydration of fructose and glucose to 5-hydroxymethylfurfural was studied using LaOCl/Nb.sub.2O.sub.5 in hot compressed water conditions. The catalysts were prepared by impregnation of LaCl.sub.3 on Nb.sub.2O.sub.5 with different loadings. The solids were characterized by EDX, XRD, TGA and N.sub.2 physisorption at 77 K and pyridine and CO.sub.2 adsorption followed by FTIR; the strength of acidity and basicity was determined by NH.sub.3-TPD and CO.sub.2-TPD, respectively. The use of acid-base systems for HMF production mainly from glucose requires weak basic sites and moderate acidity condition that is reached with LaOCl/Nb.sub.2O.sub.5 as was confirmed by acidity and basicity analyses. The presence of Nb.sub.2O.sub.5 increase HMF yield (>50%) and prevented the formation of undesirable products in hot compressed water conditions, similar results could be obtained with DMSO.