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Solid State NMR Characterization of Sn-Beta Zeolites that Catalyze Glucose Isomerization and Epimerization

Abstract

High resolution, multi-nuclear solid state nuclear magnetic resonance (NMR) characterizations are carried out in order to obtain insights into the structural features of Sn-beta zeolites that catalyze glucose isomerization or epimerization reactions in water and methanol solvents. In particular, we focus on investigating the local structural changes to catalytically-active framework Sn sites of different 119Sn-labeled beta zeolites, including the calcined, dehydrated, rehydrated, and post-sugar isomerization catalysis forms. Magic angle spinning (MAS) and cross polarization MAS (either from 1H or 19F) 119Sn NMR spectra provide evidence for changes to the local framework Sn coordination in the presence of water and sugar molecules, and provide insights into structural features of adsorbed intermediates that may be relevant in sugar isomerization reaction pathways.

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Acknowledgments

We thank Drs. Yuriy Roman-Leshkov, Manuel Moliner, and Eranda Nikolla for their earlier contributions in the Davis group at California Institute of Technology. This work was financially supported as part of the Catalysis Center for Energy Innovation, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001004. The NMR facility at Caltech was supported by the National Science Foundation (NSF) under Grant Number 9724240 and partially supported by the MRSEC Program of the NSF under Award Number DMR-520565.

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Correspondence to Son-Jong Hwang.

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Hwang, SJ., Gounder, R., Bhawe, Y. et al. Solid State NMR Characterization of Sn-Beta Zeolites that Catalyze Glucose Isomerization and Epimerization. Top Catal 58, 435–440 (2015). https://doi.org/10.1007/s11244-015-0388-7

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  • DOI: https://doi.org/10.1007/s11244-015-0388-7

Keywords

  • Sn-beta
  • Isomerization
  • 119Sn NMR
  • Glucose
  • Fructose
  • Solid state NMR