期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 194, 期 -, 页码 126-134出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2014.04.003
关键词
Hierarchical zeolites; Acidity; Calorimetry; Fructose dehydration
类别
资金
- Serbian Ministry of Education and Science [172018]
The acidity of hierarchical USY, Beta and ZSM-5 zeolites obtained by alkaline treatment was investigated. Samples were characterized by low temperature nitrogen adsorption, X ray diffraction and solid-state (27)AI MAS NMR. Acidity of parent and mesoporous samples was estimated through the adsorption of typical probe molecules - measurements were conducted in both gas phase (microcalorimetry/volumetry of ammonia adsorption, FTIR spectrometry of pyridine adsorption/desorption) and aqueous phase (calorimetry of phenylethylamine adsorption). Quantitative distributions in strength of the acid sites were determined, as well as acid sites concentrations. No significant changes in total acidity were detected for ZSM-5. Acid sites strength was decreased in modified Beta and USY zeolites. The samples were probed as catalysts for the dehydration of fructose. Higher selectivities towards 5-hydroxymethylfurfural were detected for all modified zeolites, compared to the parent ones. (C) 2014 Elsevier Inc. All rights reserved.
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