Solid state NMR characterization of Sn-Beta catalysts

TL;DRAbstract

High-resoln. multi-nuclear solid state NMR characterization has been performed to obtain insight into the
\nmechanism of glucose reactions with Sn-beta zeolites. Glucose isomerization or epimerization reactions in
\nwater and non-aq. environments were examd. thoroughly, and correlations between catalyst structural changes
\nand reaction selectivity were the primary focus in this study. In particular, we investigated local structural
\nchanges around the catalytically active Sn sites of ^(119)Sn-labeled beta zeolite in different states, including in
\ntheir as synthesized form, after calcination in flowing air, after adsorption of sugar mols., and after performing
\ncatalytic reaction cycles. Magic angle spinning (MAS) and cross polarization (CP) (either from ^1H or ^(19)F) MAS
\n^(119)Sn NMR spectra provided insight into changes in local Sn coordination in the framework of zeolite beta
\nunder various conditions. Other NMR results, including ^(13)C NMR o

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