(597h) Regulating Lattice Oxygen Property of TiO2 redox Catalyst for Enhanced Oxidative Dehydrogenation of Ethane

Ethane oxidative dehydrogenation appears to be one of the most promising technologies in terms of potential industrial applications for ethylene production. However, creating a catalyst with improved selectivity without sacrificing catalytic activity remains a difficult issue. In this study, a systematic set of catalysts (V₅TiO₂, Mn₇V₅TiO₂, Mn₂Ce₂V₇TiO₂ and Mn₄Ce₂Fe₆V₆TiO₂) with redox performance were designed by machine learning. Different metals and their combinations modulated the lattice oxygen properties of titanium dioxide catalysts, thus achieving precise regulation of catalytic performance and product distribution. The results showed that Mn₇V₅TiO₂ had medium ethylene selectivity (55.5%) and high conversion rate (61.8%). The redox capacity was enhanced and both V⁵⁺ and the lattice oxygen species available to oxidative dehydrogenation reaction were enriched by incorporation of atomically dispersed Ce species. Mn₄Ce₂V₇TiO₂ was found to be highly selective for ethylene, with the selectivity of 94.4%. After optimizing the process conditions, Mn₄Ce₂V₇TiO₂ obtained higher ethane conversion (65.2%) and stable ethylene selectivity (89.6%). These results show that Mn₄Ce₂V₇TiO₂ catalyst has great application potential in the oxidative dehydrogenation of ethane.