Microballs Containing Ni(0)Pd(0) Nanoparticles for Highly Selective Micellar Catalysis in Water
作者:Manisha Bihani、Pranjal P. Bora、Maarten Nachtegaal、Jacek B. Jasinski、Scott Plummer、Fabrice Gallou、Sachin Handa
DOI:10.1021/acscatal.9b02316
日期:2019.8.2
water, which poses a significant hindrance to their application in aqueous synthetic catalysis. To overcome these barriers, ligated Ni(0) nanoparticles (diameter <1 nm) containing a minimum amount of Pd(0) in the microballs formed of amphiphile PS-750-M are developed and applied in the highly selective carbamate cleavage. Selectivity and functional group tolerance are thoroughly investigated. Control
Ni(0)配合物和纳米颗粒(NPs)在水中都是不稳定的,这极大地阻碍了它们在水性合成催化中的应用。为克服这些障碍,开发了由两亲PS-750-M形成的微球中含有最少Pd(0)的连接的Ni(0)纳米粒子(直径<1 nm),并将其应用于高度选择性的氨基甲酸酯裂解。对选择性和官能团耐受性进行了深入研究。对照实验揭示了纳米催化剂的各个组分的重要性。使用基于脯氨酸的两亲物PS-750-M对于实现微球结构,纳米颗粒的稳定性和所需的催化活性至关重要。一旦形成,就可以将微球分离并保存在环境温度下。X射线光电子能谱对催化剂进行了全面表征,扫描电子显微镜,高分辨率透射电子显微镜,热重分析,红外和循环伏安法。对于选择性催化,Ni和Pd的零氧化态至关重要。在催化剂表征和控制实验的基础上,提出了合理的反应机理。