A novel heterogeneous Pd catalyst has been developed by decorating palladium onto the surface of N-aminoguanidine functionalized magnetic graphene oxide nanosheets (denoted as Pd@AGu-MGO), while the diethylene glycol (DEG) group has been applied as an organic spacer. The usefulness of the Pd@AGu-MGO nanocatalyst was investigated in palladium catalyzed organic reactions including Heck/Suzuki couplings of aryl halides and reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The nanocatalyst showed high efficiency and thermal stability (up to 300 °C). The catalyst recovery test was performed using an external magnet device, and showed that this catalyst can be reused several times without a significant decrease in its performance and catalytic activity. The loading level of Pd in the Pd@AGu-MGO catalyst was assessed as 0.9 mmol g−1 by ICP-AES and elemental analysis. This catalyst is more remarkable from the environmental and economic points of view because of its key properties such as high efficiency and turnover frequency (TOF), mild reaction conditions, utilization of green solvent, simple product work-up, and easy catalyst recovery.
开发了一种新型Pd异质催化剂,通过将
钯修饰在N-
氨基
胍功能化的磁性氧化
石墨烯纳米片表面(记为Pd@AGu-MGO),并采用
二甘醇(
DEG)作为有机间隔基团。研究了Pd@AGu-MGO纳米催化剂在有机反应中的应用,包括卤代
芳烃的Heck/Suzuki偶联反应和4-
硝基苯酚(4-NP)还原为4-
氨基苯酚(4-AP)。该纳米催化剂表现出高效率和热稳定性(高达300 °C),利用外部磁力装置进行催化剂回收测试,表明该催化剂可重复使用多次而性能和催化活性无显著下降。通过ICP-AES和元素分析评估,Pd@AGu-MGO催化剂中Pd的负载量为0.9 mmol g
−1。从环境和经济的角度来看,由于其关键特性,如高效率和周转频率(TOF)、温和的反应条件、使用绿色溶剂、简单的产品后处理和易于催化剂回收,该催化剂更为突出。