Feb. 2018, Volume 12 Issue 1
(Dongxu Han, Zhiguo Zhang, Zongbi Bao, Huabin Xing, Qilong Ren, pp. 113‒123)
Bimetallic nanocatalysts not only combine the properties of individual constituents but also may have enhanced catalytic activity, selectivity, and stability. This may be attributed to the modulation of the charge transfer between different metals and surface element distribution. Thus, the development of bimetallic nanoparticles, in particular, palladium with non-noble metals, has long proven value in the past few years. Among Pd-non-noble metal NPs reported, Pd-Ni NPs have demonstrated to be efficient and economic catalysts for diverse transformations. In this paper, we successfully prepared TiO2
-supported Pd-Ni nanoparticles with the mean diameter of approximately two nanometers through a one-step impregnation reduction route. The as-prepared Pd-Ni/TiO2
exhibited enhanced catalytic activity compared to an equal amount of Pd/TiO2
as well as excellent stability, recyclability and applicability in the Suzuki-Miyaura reactions. The catalytic results show that the substrate iodobenzenes and phenylboronic acids bearing with either electron-donating or electron-withdrawing groups gave the corresponding product in excellent yields. Besides, there was no considerable loss in catalytic activities of the Pd-Ni/TiO2
catalyst after four recycles. Moreover, among these Pd-Ni/TiO2
catalysts with different compositions of Ni and Pd, the one with the Ni:Pd ratio of 2.95 showed the best activity.