Hydrogen Peroxide Producing Titania-Silica Supraparticles as Tailorable Photocatalysts for Flow Chemistry Reactions in Microfluidic Reactors

The development of hybrid catalysts for cascade reactions thatdemonstrate high efficiency and longevity strongly relies on the precise arrangementof the individual components within such a material. This guarantees both theirproximity for enhanced interaction and, at the same time, sufficient separationavoiding mutual harm. Before the acutal design of a usually very complex hybridcatalyst, it is essential to study and understand the impact of structural characteristicson catalytic activities of each catalytically active constituent separately. This studythus focuses on a comprehensive structure-activity analysis of the component withina highly customizable TiO2-SiO2 material, which produces H2O2 photocatalytically.The tailorable design of the hybrid material is achieved through the utilization of thespray-drying process. The H2O2 productivity of the obtained so-called TiO2-SiO2 supraparticles is demonstrated in both a batch anda flow reactor, marking a crucial step toward their future application as hybrid catalysts in photoassisted cascade reactions.