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首页> 外文期刊>Pure and Applied Chemistry >Graphene hydrogel supported palladium nanoparticles as an efficient and reusable heterogeneous catalysts in the transfer hydrogenation of nitroarenes using ammonia borane as a hydrogen source
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Graphene hydrogel supported palladium nanoparticles as an efficient and reusable heterogeneous catalysts in the transfer hydrogenation of nitroarenes using ammonia borane as a hydrogen source

机译：石墨烯水凝胶负载钯纳米粒子，作为使用氨基硼烷作为氢气源的硝基甲烷的转移氢化的有效和可重复使用的非均相催化剂

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摘要

Addressed herein is a facile one-pot synthesis of graphene hydrogel (GHJ) supported Pd nanoparticles (NPs), namely Pd-GHJ nanocomposites, via a novel method that comprises the combination of hydrothermal treatment and polyol reduction protocols in water. The structure Pd-GHJ nanocomposites were characterized by TEM, HR-TEM, XRD, XPS, Raman spectroscopy and BET surface area analysis. Then, Pd-GHJ nanocomposites were used as a heterogeneous catalysts in the tandem dehydrogenation of ammonia borane and hydrogenation of nitroarenes (Ar–NO2) to anilines (Ar–NH2) in the water/methanol mixture at room temperature. A variety of Ar–NO2 derivatives (total 9 examples) were successfully converted to the corresponding Ar–NH2 by the help of Pd-GHJ nanocomposites catalyzed tandem reactions with the conversion yields reaching up to 99% in only 20 min reaction time. Moreover, Pd-GHJ nanocomposites were demonstrated to be the reusable catalysts in the tandem reactions by preserving their initial catalytic performance after five consecutive catalytic cycles. It is believed that the presented synthesis protocol for the Pd-GHJ nanocomposites and the catalytic tandem hydrogenation reactions will make a significant contribution to the catalysis and synthetic organic chemistry fields.
机译：本文寻址的是石墨烯水凝胶（GHJ）支持的PD纳米颗粒（NPS），即Pd-GHJ纳米复合材料的容易单罐合成，所述方法包括包括水热处理和多元醇还原方案在水中的组合。该结构PD-GHJ纳米复合材料的特征在于TEM，HR-TEM，XRD，XPS，拉曼光谱和BET表面积分析。然后，Pd-GHJ纳米复合材料用作氨硼烷串联脱氢的非均相催化剂，并在室温下水/甲醇混合物中的苯胺（Ar-NO 2）氢化硝基酮（Ar-NO 2）。通过PD-GHJ纳米复合材料的帮助，通过PD-GHJ纳米复合材料成功转化为相应的AR-NH 2的各种AR-NO 2衍生物（总共9个实施例）在20分钟的反应时间内达到高达99％的转化率达到99％。此外，通过在连续五个催化循环后保持其初始催化性能，将PD-GHJ纳米复合材料证明是串联反应中的可重复使用催化剂。据信，PD-GHJ纳米复合材料的合成方案和催化串联氢化反应将对催化和合成有机化学领域作出显着贡献。

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