Al2O3-Supported W-V-O bronzes catalysts for oxidative dehydrogenation of ethane

[EN] Supported vanadium-containing hexagonal tungsten bronzes (HTBs) were prepared for the first time using a combination of a new soft synthetic procedure and fine-tuned heat treatments. The characterization of heat-treated samples indicates that both unsupported and Al2O3-supported materials present mainly vanadium-containing crystals with HTB structure smaller in the supported materials. Raman, diffuse reflectance UV-visible and EPR spectroscopic results suggest the presence of different V species depending on the V loading and catalyst composition. When used as catalysts for ethane oxidative dehydrogenation (ODH), selected supported vanadium-HTBs show selectivity to ethylene as high as 80% at ethane conversion of around 18%. These values position these new materials among the most active and selective catalysts so far reported in the literature for ethane ODH over supported vanadium oxide catalysts.The authors acknowledge the DGICYT in Spain (projects RTI2018-099668-B-C21 and SEV-2016-0683) for financial support. The research group of Prof. Fabrizio Cavani (University of Bologna, Italy) and Consorzio INSTM (Firenze) are gratefully acknowledged for a PhD grant to A. C. The authors also thank the Electron Microscopy Service of Universitat Politecnica de Valencia for its support.Benomar, S.; Chieregato, A.; Masso, A.; Soriano Rodríguez, MD.; Vidal Moya, JA.; Blasco Lanzuela, T.; Issaadi, R.... (2020). Al2O3-Supported W-V-O bronzes catalysts for oxidative dehydrogenation of ethane. Catalysis Science & Technology. 10(23):8064-8076. https://doi.org/10.1039/d0cy01220c806480761023GUO, J.-D., & WHITTINGHAM, M. S. (1993). TUNGSTEN OXIDES AND BRONZES: SYNTHESIS, DIFFUSION AND REACTIVITY. 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