Photocatalytic synthesis of value‐added chemicals has gained increasing attention in recent years owing to its versatility in driving many important reactions under ambient conditions. Selective hydrogenation, oxidation, coupling, and halogenation with a high conversion of the reactants have been realized using designed photocatalysts in batch reactors with small volumes at a laboratory scale; however, scaling‐up remains a critical challenge due to inefficient utilization of incident light and active sites of the photocatalysts, resulting in poor catalytic performance that hinders its practical applications. Flow systems are considered one of the solutions for practical applications of light‐driven reactions and have experienced great success in photolytic and homogeneous photocatalysis, yet their applications in heterogeneous photocatalysis are still under development. In this perspective, we have summarized recent progress in photolytic and photocatalytic synthetic chemistry performed in flow systems from the view of reactor design with a special focus on heterogeneous photocatalysis. The advantages and limitations of different flow systems, as well as some practical considerations of design strategies are discussed.

中文翻译：

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流动合成化学：从光解和均相光催化到多相光催化

近年来，增值化学品的光催化合成因其在环境条件下驱动许多重要反应的多功能性而受到越来越多的关注。使用设计的光催化剂在实验室规模的小体积间歇式反应器中实现了选择性氢化、氧化、偶联和卤化，反应物的高转化率；然而，由于入射光和光催化剂活性位点的利用效率低下，扩大规模仍然是一个严峻的挑战，导致催化性能较差，阻碍了其实际应用。流动系统被认为是光驱动反应实际应用的解决方案之一，并且在光解和均相光催化方面取得了巨大成功，但其在多相光催化中的应用仍在开发中。从这个角度来看，我们从反应器设计的角度总结了流动系统中光解和光催化合成化学的最新进展，特别关注多相光催化。讨论了不同流动系统的优点和局限性，以及设计策略的一些实际考虑。