负载型Au-Ni合金催化剂应用于芳香硝基化合物选择加氢反应

摘要

采用改进的两步还原法制备了SiO2负载的Au-Ni合金催化剂,催化剂中Au-Ni纳米颗粒高度分散于SiO2载体表面. Au-Ni合金催化剂在温和条件下芳香硝基化合物选择加氢反应中表现出比两种单金属催化剂更高的活性和选择性,体现出Au-Ni之间明显的协同作用.其中AuNi3/SiO2催化剂具有最好的性能,反应70 min,转化率和选择性分别达到90.8%和93.0%.%A modified two‐step approach was developed for the synthesis of uniform and highly dispersed Au‐Ni alloy nanoparticles on a silica support. The supported Au‐Ni alloy nanoparticles were inves‐tigated for the chemoselective hydrogenation of substituted nitroarenes, which showed a strong synergistic effect between Au and Ni. The best catalyst was AuNi3/SiO2 that afforded a selectivity to 3‐vinylaniline of 93.0%at a 3‐nitrostyrene conversion of 90.8%after 70 min under mild conditions.