Competitive adsorption of substrate and solvent in Sn‐beta zeolite during sugar isomerization

W.N.P. van der Graaff, C.H.L. Tempelman, G. Li, B. Mezari, N. Kosinov, E.A. Pidko, E.J.M. Hensen

Research output: Contribution to journalArticleAcademicpeer-review

26 Citations (Scopus)
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Abstract

The isomerization of 1,3-dihydroxyactone and d-glucose over Sn-Beta zeolite was investigated by in situ 13C NMR spectroscopy. The conversion rate at room temperature is higher when the zeolite is dehydrated before exposure to the aqueous sugar solution. Mass transfer limitations in the zeolite micropores were excluded by comparing Sn-Beta samples with different crystal sizes. Periodic density functional theory (DFT) calculations show that sugar and water molecules compete for adsorption on the active framework Sn centers. Careful solvent selection may thus increase the rate of sugar isomerization. Consistent with this prediction, batch catalytic experiments show that the use of a co-solvent, such as tetrahydrofuran, that strongly interacts with the Sn centers suppresses glucose isomerization. On the other hand, the use of ethanol as cosolvent results in significantly higher isomerization activity in comparison with pure water because of decreased competition with glucose adsorption on zeolitic Sn sites.
Original languageEnglish
Pages (from-to)3145-3149
Number of pages5
JournalChemSusChem
Volume9
Issue number22
DOIs
Publication statusPublished - 2016

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