Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey; East Anatolian High Technology Research and Application Center (DAYTAM), Atatürk University, 25240 Erzurum, Turkey.
Department of Chemistry, Faculty of Science, Atatürk University, 25240 Erzurum, Turkey; East Anatolian High Technology Research and Application Center (DAYTAM), Atatürk University, 25240 Erzurum, Turkey.
J Colloid Interface Sci. 2017 Jul 15;498:378-386. doi: 10.1016/j.jcis.2017.03.066. Epub 2017 Mar 18.
Addressed herein is a facile seed-mediated synthesis of Ag/Pd core/shell nanoparticles (NPs) and their assembly on reduced graphene oxide (rGO) to catalyze the transfer hydrogenation of nitroarenes to anilines using ammonia borane (AB) as a hydrogen donor under ambient conditions. Monodisperse Ag/Pd core/shell NPs with controllable Pd shell-thickness were synthesized by the means of thermal decomposition of palladium(II) bromide over as-prepared Ag NPs in the mixture of oleylamine and oleic acid at 220°C. As-synthesized Ag/Pd core/shell NPs were characterized by TEM, HR-TEM, XRD, XPS, UV-Vis spectroscopy and ICP-MS and then they were assembled on reduced graphene oxide (rGO). Next, rGO@Ag/Pd catalysts were tested in the transfer hydrogenation of nitroarenes in which ammonia borane (AB) was used as a hydrogen donor at room temperature. It was demonstrated that the thickness of the Pd shell has a significant effect on the catalytic activity of rGO@Ag/Pd catalysts and the 1.75nm Pd shell provided the highest performance in the transfer hydrogenation reactions. The rGO@Ag/Pd catalyzed transfer hydrogenation reactions were tested over a variety of nitroarenes (total 16 examples) and they were all converted to the corresponding aniline derivatives with high yields in 5-15min under ambient conditions.
本文介绍了一种简便的种子介导法合成 Ag/Pd 核壳纳米粒子(NPs),并将其组装在还原氧化石墨烯(rGO)上,以在环境条件下使用氨硼烷(AB)作为氢供体催化硝基芳烃向苯胺的转移氢化。通过在 220°C 的油胺和油酸混合物中,在预先制备的 Ag NPs 上热分解二氯化钯,制备了具有可控 Pd 壳厚度的单分散 Ag/Pd 核壳 NPs。所合成的 Ag/Pd 核壳 NPs 通过 TEM、HR-TEM、XRD、XPS、UV-Vis 光谱和 ICP-MS 进行了表征,然后将其组装在还原氧化石墨烯(rGO)上。接下来,在硝基芳烃的转移氢化中测试了 rGO@Ag/Pd 催化剂,其中氨硼烷(AB)在室温下用作氢供体。结果表明,Pd 壳的厚度对 rGO@Ag/Pd 催化剂的催化活性有显著影响,1.75nm 的 Pd 壳在转移氢化反应中表现出最高的性能。rGO@Ag/Pd 催化的转移氢化反应在各种硝基芳烃(总共 16 个实例)上进行,在环境条件下,它们在 5-15min 内都以高产率转化为相应的苯胺衍生物。