Transition metal-catalyzed semi-hydrogenation of alkynes has become one of the most popular methods for alkene synthesis. Specifically, the noble metal Pd, Rh, and Ru-based heterogeneous catalysts have been widely studied and utilized in both academia and industry. But the supported noble metal catalysts are generally suffering from leaching or aggregation during harsh reaction conditions, which resulting low catalytic reactivity and stability. Herein, we reported the facile synthesis of nitrogen doped graphene encapsulated Pd catalyst and its application in the chemo-selective semi-hydrogenation of alkynes. The graphene layer served as “bulletproof” over the active Pd Nano metal species, which was confirmed by X-ray and TEM analysis, enhanced the catalytic stability during the reaction conditions. The optimized prepared Pd@N/C catalyst showed excellent efficiency in semi-hydrogenation of phenylacetylene and other types of alkynes with un-functionalized or functionalized substituents, including the hydrogenation sensitive functional groups (NO₂, ester, and halogen).

过渡金属催化的炔烃半加氢已成为最流行的烯烃合成方法之一。具体而言，贵金属 Pd、Rh 和 Ru 基多相催化剂已在学术界和工业界得到广泛研究和应用。但负载型贵金属催化剂在苛刻的反应条件下通常会发生浸出或聚集，导致催化反应活性和稳定性较低。在此，我们报道了氮掺杂石墨烯包封 Pd 催化剂的简便合成及其在炔烃化学选择性半氢化中的应用。通过 X 射线和 TEM 分析证实，石墨烯层对活性 Pd 纳米金属物种起到了“防弹”作用，增强了反应条件下的催化稳定性。优化的准备Pd@N/C催化剂在苯乙炔和其他类型炔烃的半氢化中表现出优异的效率，这些炔具有未官能化或官能化的取代基，包括氢化敏感官能团（NO ₂、酯和卤素）。