期刊
CHEMSUSCHEM
卷 8, 期 6, 页码 1088-1094出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201402965
关键词
alcohols; heterogeneous catalysis; isomerization; NMR spectroscopy; zeolites
资金
- Ministerio de Ciencia e Innovacion of Spain [CTQ2011-28216]
- Regional Government of Madrid [S2013-MAE-2882]
- Danish Council for Independent Research-Technology and Production Sciences [10-081991]
- Danish Ministry of Science, Technology and Innovation
- Haldor Topsoe A/S
Isomerization of xylose to xylulose was efficiently catalyzed by large-pore zeolites in a two-step methanol-water process that enhanced the product yield significantly. The reaction pathway involves xylose isomerization to xylulose, which, in part, subsequently reacts with methanol to form methyl xyluloside (step1) followed by hydrolysis after water addition to form additional xylulose (step2). NMR spectroscopy studies performed with C-13-labeled xylose confirmed the proposed reaction pathway. The most active catalyst examined was zeoliteY, which proved more active than zeolite beta, ZSM-5, and mordenite. The yield of xylulose obtained over H-USY (Si/Al=6) after 1h of reaction at 100 degrees C was 39%. After water hydrolysis in the second reaction step, the yield increased to 47%. Results obtained from pyridine adsorption studies confirm that H-USY (6) is a catalyst that combines BrOnsted and Lewis acid sites, and isomerizes xylose in alcohol media to form xylulose at low temperature. The applied zeolites are commercially available; do not contain any auxiliary tetravalent metals, for example, tin, titanium, or zirconium; isomerize xylose efficiently; are easy to regenerate; and are prone to recycling.
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