Preparation of magnetically recoverable carbon nanotube-supported Pd(II) catalyst
(2019) Catalysis Today — Vol. 334, p. 24-29 (2019)
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- Multi-walled carbon nanotubes were filled or externally decorated with iron oxide nanoparticles to make them magnetically-recoverable. In the first case, the external surface was treated to be free of defects and oxygenated groups to favor internalization. A thermal decomposition route was followed in the second case. The formed nanoparticles were characterized and shown to consist in magnetite and/or maghemite. Moreover, when placed on the external surface of carbon nanotubes, they remained small and well-dispersed, leaving high proportion of free carbon surface for further functionalization. The intact sp2 carbon atoms were subsequently attacked by means of xanthate radical chemistry, followed by post-functionalization to graft a dipyridylamine ligand on the surface of both solids and pristine carbon nanotubes for comparison. Solids at each step of the syntheses were characterized by X-ray photoelectron spectroscopy (XPS). Palladium coordination onto the surface ligand was studied and the precursor [Pd(COD)Cl2] complex gave the best results to afford CNT-supported molecular Pd(II) catalysts. XPS confirmed the +2 oxidation state of palladium on the carbon surface. The so-prepared magnetically-recoverable catalysts were successfully used in Suzuki-Miyaura cross-coupling catalytic application.
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Desmecht, A., Pennetreau, F., L’hoost, A., Nircha, I., Pichon, B. P., Riant, O., & Hermans, S. (2019). Preparation of magnetically recoverable carbon nanotube-supported Pd(II) catalyst. Catalysis Today, 334, 24-29. https://doi.org/10.1016/j.cattod.2019.02.057 (Original work published 2019)