Microwave-assisted synthesis of palladium nanoparticles supported on graphene: A highly active and recyclable catalyst for carbon–carbon cross-coupling reactions
作者:Ali R. Siamaki、Abd El Rahman S. Khder、Victor Abdelsayed、M. Samy El-Shall、B. Frank Gupton
DOI:10.1016/j.jcat.2010.12.003
日期:2011.4
Pd nanoparticles supported on graphene (Pd/G) by microwave-assisted chemical reduction of the corresponding aqueous mixture of a palladium salt and dispersed graphite oxide (GO) sheets. The Pd/G demonstrated excellent catalytic activity for the carbon–carbon cross-coupling reactions (Suzuki, and Heck) with a broad range of utility under ligand-free ambient conditions in an environmentally friendly
我们已经开发出一种有效的方法,可以通过微波辅助化学还原钯盐和分散的氧化石墨(GO)片材的相应含水混合物来生成负载在石墨烯(Pd / G)上的高活性Pd纳米颗粒。Pd / G对碳-碳交叉偶联反应(Suzuki和Heck)表现出出色的催化活性,在无溶剂的环境条件下,在环境友好的溶剂体系中具有广泛的用途。它还具有出色的周转频率(108,000 h -1)在微波辅助的Suzuki交叉偶联反应中观察到,与反应混合物相比,该反应易于去除,可回收性却不损失活性,并且性能明显优于市售的Pd / C催化剂。通过多种光谱技术对催化剂进行了全面表征,包括X射线衍射(XRD),拉曼光谱,TGA,电子显微镜(SEM,TEM)和X射线光电子能谱(XPS)。Pd / G催化剂对Suzuki交叉偶联反应的显着反应性归因于高效微波对高粒径7–9 nm石墨烯片上负载的Pd(0)纳米颗粒的高度分散性和浓度辅助还原法。