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

Paper ID Volume ID Publish Year Pages File Format Full-Text
39953 45841 2014 6 PDF Available
Title
Ni2O3-around-Pd hybrid on graphene oxide: An efficient catalyst for ligand-free Suzuki–Miyaura coupling reaction
Abstract

•Ni2O3 isolated Pd clusters was prepared on the surface of graphene.•Highly dispersed Pd (2.5 nm) could be generated by adjustment of Ni to Pd ratio.•Ni2O3 isolated Pd exhibited higher activity for Suzuki coupling reactions.•Ni2O3 has multiple roles in exfoliating graphene, mediating size and stability of Pd.•Reactant enrichment and intimate interaction of metals lead to excellent activity.

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−1 at 80 °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.

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Keywords
Graphene oxide; Palladium; Nickel oxide; Suzuki coupling
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Ni2O3-around-Pd hybrid on graphene oxide: An efficient catalyst for ligand-free Suzuki–Miyaura coupling reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 473, 5 March 2014, Pages 1–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us