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Download fileReOx/TiO2: A Recyclable Solid Catalyst for Deoxydehydration
journal contribution
posted on 2016-02-04, 15:18 authored by Lennart Sandbrink, Elisabeth Klindtworth, Husn-Ubayda Islam, Andrew
M. Beale, Regina PalkovitsDeoxydehydration (DODH) enables the
transformation of two adjacent
hydroxyl functions into a C–C double bond: e.g., facilitating
synthesis of 1,3,5-hexatriene from sorbitol. Here we report the first
stable heterogeneous catalyst for DODH based on ReOx supported on TiO2. ReOx/TiO2 exhibits not only catalytic activity and selectivity
comparable to those of previously described molecular rhenium catalysts
but also excellent stability without deactivation over at least six
consecutive runs. X-ray absorption spectroscopy (XAFS) measurements
indicate a mixture of Re(VII), Re(IV), and Re(0) species at a ratio
of 0.47:0.27:0.25, remaining comparatively stable during catalysis.