Pd/PdO nanoparticles supported on carbon nanotubes: A highly effective catalyst for promoting Suzuki reaction in water

• Pd/PdO nanoparticles supported on oxidized carbon nanotubes are synthesized.
• PdO nanoparticles can significantly enhance the catalytic reactivity.
• Pd/PdO catalyst can be readily recovered and reused for 10 times.

We report that the presence of PdO nanoparticles can enhance the catalytic performance of Pd catalyst for the Suzuki reaction in water. Heterogeneous Pd/PdO nanoparticles supported on multi-walled carbon nanotubes (CNTs), weakly oxidized multi-walled carbon nanotubes (WCNTs) and strongly oxidized multi-walled carbon nanotubes (SCNTs) catalysts are synthesized by a one-pot gas–liquid interfacial plasma (GLIP) method using Pd(NO3)2·2H2O as precursor. Among these synthesized catalysts, the Pd/PdO supported on WCNTs (Pd/PdO/WCNTs) catalyst exhibits the highest catalytic activity during the Suzuki reaction in water. Moreover, the Pd/PdO catalyst shows higher catalytic activity during the Suzuki reaction than Pd catalyst. The as-prepared catalyst displayed remarkable activity toward challenging substrates such as heteroaryl halides and ortho-substituted aryl halides as well as aryl chlorides using low Pd loading in good yields. Since the catalyst exhibits extremely low solubility in organic solvent, the product can be simply extracted with ethyl acetate while the catalyst remained in the aqueous phase. The catalyst can be simply and efficiently used for ten consecutive runs without significant decrease in activity.

The presence of PdO nanoparticles can enhance the catalystic performance of Pd catalyst for the Suzuki reaction in water. Heterogeneous Pd/PdO nanoparticles supported on multi-walled carbon nanotubes, weakly oxidized multi-walled carbon nanotubes and strongly oxidized multi-walled carbon nanotubes are synthesized by a one-pot gas–liquid interfacial plasma method by using Pd(NO3)2·2H2O precursors. The Pd/PdO supported on weakly oxidized multi-walled carbon nanotubes catalyst exhibits higher catalytic activity during the Suzuki reaction than other PdO/Pd and Pd catalysts.Figure optionsDownload high-quality image (183 K)Download as PowerPoint slide