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In this work, Cu<jats:sub>x<\/jats:sub>O\/TiO<jats:sub>2<\/jats:sub> composites with different mominal CuO loadings (in the range of 0.5\u20138.4\u2005wt\u2009%) were used to promote the photocatalytic epoxidation of propylene with molecular oxygen under UV\u2010A irradiation in a fluidized bed system. The photocatalysts were prepared by a straightforward method consisting of thermal annealing of physical mixtures between copper acetate and sol\u2010gel\u2010derived TiO<jats:sub>2<\/jats:sub>. Different characterization techniques were employed to assess the influence of Cu<jats:sub>x<\/jats:sub>O content on the physical\u2010chemical properties of the Cu<jats:sub>x<\/jats:sub>O\/TiO<jats:sub>2<\/jats:sub> composites. The best combination in terms of propylene conversion and selectivity towards propylene oxide (18.1\u2009% and 72\u2009%, respectively) was obtained with Cu<jats:sub>x<\/jats:sub>O\/TiO<jats:sub>2<\/jats:sub> at 1.1\u2005wt % CuO, as shown by photocatalytic tests. The high propylene oxide selectivity is due to the ability of CuO in the Cu<jats:sub>x<\/jats:sub>O\/TiO<jats:sub>2<\/jats:sub> composite to transform molecular O<jats:sub>2<\/jats:sub> into hydrogen peroxide that, in turn, is able to directly oxidize propylene to propylene oxide. By using a UV\u2010A light intensity of 297.2\u2005mW\u2009cm<jats:sup>\u22122<\/jats:sup>, the propylene conversion and the epoxide yield were 31.5 and 22.2\u2009%, respectively, significantly higher than that reported in the literature. Moreover, the energy consumption of the reaction system employed in this paper was significantly lower than that of photocatalytic systems studied in the literature dealing with selective propylene epoxidation.<\/jats:p>","DOI":"10.1002\/cssc.202401546","type":"journal-article","created":{"date-parts":[[2024,11,26]],"date-time":"2024-11-26T08:28:57Z","timestamp":1732609737000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Unraveling the Role of CuO in Cu<sub>x<\/sub>O\/TiO<sub>2<\/sub> Photocatalyst for the Direct Propylene Epoxidation With O<sub>2<\/sub> in a Fluidized Bed Reactor"],"prefix":"10.1002","volume":"18","author":[{"given":"Nicola","family":"Morante","sequence":"first","affiliation":[{"name":"Department of Industrial Engineering University of Salerno  Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olimpia","family":"Tammaro","sequence":"additional","affiliation":[{"name":"Department of Applied Science and Technology INSTM Unit of Torino \u2013 Politecnico Politecnico di Torino  Corso Duca degli Abruzzi 24 10129 Torino Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katia","family":"Monzillo","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering University of Salerno  Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Diana","family":"Sannino","sequence":"additional","affiliation":[{"name":"Department of Industrial Engineering University of Salerno  Via Giovanni Paolo II 132 84084 Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alfio","family":"Battiato","sequence":"additional","affiliation":[{"name":"Physics Department University of Torino  via P. 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