Nb₂O₅ supported catalysts for cross-coupling reactions

Abstract

Palladium and nickel supported on Nb₂O₅ were synthesized via wet impregnation method and tested for the Suzuki-Miyaura reaction. The catalysts were characterized by X-ray fluorescence, textural analysis, scanning and transmission electron microscopy, thermogravimetry/differential thermal analysis and X-ray diffraction. Palladium catalyst resulted in high isolated yields (91%). Satisfactory yields (48%) were achieved employing the nickel catalyst. Hot filtration experiments were performed to evaluate the reaction heterogeneity. The catalysts were submitted to consecutive reactions runs to assess recyclability. Deactivation was attributed to catalyst loss by filtration between cycles, minor leaching of the active phase and poisoning by inorganic species.

Graphical Abstract

Keywords:

• Suzuki-Miyaura
• supported catalysts
• p-Phenyl anisole
• niobium pentoxide
• nickel

Acknowledgements

The authors thank the Companhia Brasileira de Metalurgia e Mineração (CBMM) for donation of the niobic acid (HY-340), precursor raw material for Nb₂O₅.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.