Highly dispersed Pt nanoparticles (∼2.2 nm) on ordered mesoporous carbon (Pt/CMK-3–HQ) were first prepared through a two-step impregnation route with aqueous solutions of 8-hydroxyquinoline (8-HQ) and H₂PtCl₆, respectively. The Pt/CMK-3–HQ quantitatively converted various halogenated nitroarenes to the corresponding haloanilines using hydrazine hydrate with unprecedented activities (e.g., turnover frequency for o-chloronitrobenzene was 30.2 s^–1) and exhibited high stability with 20 cycles without decrease in catalytic efficiency. The high activity and chemoselectivity of Pt/CMK-3–HQ were attributed to the cooperation effect between Pt and N species, promoting cleavage of hydrazine to generate more Pt–H^– and N–H⁺ species for reduction of nitro groups and weakening the interaction between halogen groups and Pt atoms for activation of C-halogen bonds.

中文翻译：

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有序介孔碳负载铂纳米粒子催化卤代硝基芳烃的高活性和化学选择性还原

首先通过两步浸渍法，用8-羟基喹啉（8-HQ）和H ₂ PtCl ₆水溶液，在有序介孔碳（Pt / CMK-3–HQ）上制备高度分散的Pt纳米颗粒（〜2.2 nm），分别。Pt / CMK-3–HQ使用具有前所未有活性（例如，邻氯硝基苯的周转频率为30.2 s ^–1）的水合肼将各种卤代硝基芳烃定量转化为相应的卤代苯胺，并显示出20个循环的高稳定性而不会降低催化效率。Pt / CMK-3–HQ的高活性和化学选择性归因于Pt和N物种之间的协同作用，促进了肼的裂解以生成更多的Pt–H ^–和NH ⁺物种，用于还原硝基并减弱卤素基团和Pt原子之间的相互作用，以激活C卤素键。