Ni₂O₃-around-Pd hybrid on graphene oxide: An efficient catalyst for ligand-free Suzuki-Miyaura coupling reaction

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• 作者：Renfeng Nie ; Juanjuan Shi ; Weichen Du ; Zhaoyin Hou ; ^{zyhou@zju.edu.cn" class="auth_mail}
• 关键词：Graphene oxide ; Palladium ; Nickel oxide ; Suzuki coupling
• 刊名：Applied Catalysis A: General
• 出版年：5 March, 2014
• 年：2014
• 卷：473
• 期：Complete
• 页码：1-6
• 全文大小：2235 K

文摘

Ni₂O₃-around-Pd hybrid can be fabricated on graphene oxide (Pd-Ni/RGO) by a simple one-pot wet chemical route. These isolated Pd clusters showed significantly improved performance for Suzuki coupling reaction compared to that of pure Pd/RGO, Ni₂O₃/RGO, popularly reported Pd/AC, as well as homogeneous PdCl₂ and PdCl₂(PPh₃)₂. Characterizations disclosed that Ni₂O₃ plays multiple roles in exfoliating graphene sheets, mediating the size as well as stability of Pd clusters. Pd-Ni/RGO dispersed homogeneously in the aqueous reaction mixture, exhibited high enrichment towards reactants as well as extremely high activity and stability for the Suzuki coupling reaction. The best turnover frequencies of all Pd atoms reached 38,750 h^鈭? at 80 掳C for bromobenzene coupling. It was concluded that the intimate interaction between Ni₂O₃ nanoparticles and Pd clusters appears to be beneficial for activating the Pd surface for the catalytic cycle.