Effect of size of copper nanoparticles on its catalytic behaviour in Ullman reaction

Bulletin of Materials Science

关键词: Ullman reaction;    copper nanoparticles;    biphenyl;    size dependent catalytic behaviour.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The condensation of iodobenzene to biphenyl is an industrially important reaction due to its significant role in organic synthesis as drug intermediates. The reaction takes place in the presence of copper powder as catalyst. We have shown in this paper that the size of the copper nanoparticles as well as its exposed surface area is responsible for the yield of chemical reaction. The uncapped copper powder showed a 43% conversion of iodobenzene to biphenyl in 5 h under our experimental conditions. Same amount of copper nanoparticles (size, ∼ 66 nm diameter) prepared by citrate capping showed 88% conversion of iodobenzene to biphenyl, which increased to about 95% when 8 nm diameter capped copper nanoparticles are used. Surprisingly, 5 nm size copper nanoparticles showed no change in the yield of about 95%.

【 授权许可】

CC BY