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Relation between surface acidity and reactivity in fructose conversion into 5-HMF using tungstated zirconia catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
51142 46832 2013 9 PDF Available
Title
Relation between surface acidity and reactivity in fructose conversion into 5-HMF using tungstated zirconia catalysts
Abstract

Catalytic dehydration of fructose and its conversion to 5-hydroxymethylfurfural was studied using tungstated zirconia oxides, with various tungsten oxide loadings (1–20 wt.%). The samples were prepared by incipient wetness impregnation and thoroughly characterized using a combination of different techniques: structural, thermal and calorimetric analyses. Zirconia was predominantly present in the investigated samples in the tetragonal phase when the WO3 loading was above 10 wt.%. The samples exhibited amphoteric characteristics, as they adsorbed both ammonia and sulfur dioxide on their surface. The number of surface acid sites increased with increasing WO3 content. Fructose dehydration tests evidenced the formation of 5-hydroxymethylfurfural and by-products (formic and levulinic acids). The results show that the ratio of basic to acidic sites of the solid catalysts is the key parameter for the selectivity in 5-HMF, while the global fructose conversion was mainly related to the presence of acid sites of a given strength with 150 > Qdiff > 100 kJ·molNH3− 1.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A series of tungstated zirconia was prepared by incipient wetness impregnation. ► Coupling WOx species with ZrO2 improves the surface acidity and structure stability. ► Catalytic activity in aqueous dehydration of fructose. ► Catalytic activity is related to the presence of strong acid sites.

Keywords
Tungsten oxide; Zirconia supported catalysts; Surface acidity/basicity; Adsorption microcalorimetry; Catalytic fructose dehydration
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Relation between surface acidity and reactivity in fructose conversion into 5-HMF using tungstated zirconia catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 30, 5 January 2013, Pages 5–13
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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