Liquid organic hydrogen carriers (LOHC) are recently recognized as an attractive solution for H₂ storage and transportation. Among several challenging tasks for practical application, the most stringent limitations stem from the dehydrogenation reaction requiring high temperatures thermodynamically. Unlike previous reviews focusing on the LOHC concept, LOHC molecules, and process integration, this review highlights the state-of-the-art catalysts reported for the dehydrogenation of homocyclic and heterocyclic LOHC molecules. In the conversion of heterocyclic LOHC, Pd-based catalysts overnumbered Pt-based ones owing to preferential adsorption of heteroatoms onto the Pd surface. However, because of low stability of C-heteroatom bonds, catalyst development needs to concentrate on inhibiting the generation of byproducts while maintaining superior performance under mild conditions. In the case of homocyclic LOHC, Pt is overwhelmed in single metal and bimetallic catalysts owing to pronounced C-H bond cleavage. Nevertheless, the ability of Pt in C-C bond cleavage should be diminished for higher H₂ selectivity, better catalyst stability, and steady LOHC recyclability, which is possible by tuning electronic and geometric effects of main active metals, as well as adding metal promoters. Consequently, great efforts will be diversely devoted to achieving an active and stable dehydrogenation catalyst for future LOHC demonstration.

液态有机氢载体 (LOHC) 最近被认为是一种有吸引力的 H ₂解决方案储存和运输。在实际应用的几个具有挑战性的任务中，最严格的限制源于需要热力学高温的脱氢反应。与之前关注 LOHC 概念、LOHC 分子和工艺集成的评论不同，本评论重点介绍了用于同环和杂环 LOHC 分子脱氢的最先进催化剂。在杂环 LOHC 的转化中，由于杂原子优先吸附到 Pd 表面，Pd 基催化剂的数量超过了 Pt 基催化剂。然而，由于C-杂原子键的稳定性低，催化剂的开发需要集中在抑制副产物的产生，同时在温和条件下保持优异的性能。在同环 LOHC 的情况下，由于显着的 CH 键断裂，Pt 在单金属和双金属催化剂中被淹没。然而，对于更高的 H，Pt 在 CC 键断裂中的能力应该减弱₂选择性、更好的催化剂稳定性和稳定的 LOHC 可回收性，这可以通过调整主要活性金属的电子和几何效应以及添加金属促进剂来实现。因此，将付出巨大的努力，为未来的 LOHC 示范实现一种活性稳定的脱氢催化剂。