Abstract
Glass-(ceramic) samples were prepared by melting mixtures of Na2O-V2O5-(Al2O3)-P2O5-Nb2O5 in various molar ratios, and their catalytic performances were correlated to the structural, thermal, and electrical properties. The catalysts were tested in an epoxidation reaction, with tert‑butyl hydroperoxide in decane and water as oxidants. Samples containing the highest vanadium content are highlighted as the best catalysts (cyclooctene conversion 70–90 %), highly selective towards the desired epoxide (70–80 %). At the same time, high electrical conductivity is observed with the value of ∼10–5 S cm–1 @30 °C, which is 4–6 orders of magnitude higher in comparison to other studied samples.
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