Bimetallic Pd-M (M= Pt, Ni, Cu, Co) nanoparticles catalysts with strong electrostatic metal-support interaction for hydrogenation of toluene and benzene
Bimetallic Pd-M (M= Pt, Ni, Cu, Co) nanoparticles catalysts with strong electrostatic metal-support interaction for hydrogenation of toluene and benzene
复制标题
具有强静电金属-载体相互作用的双金属 Pd-M（M= Pt、Ni、Cu、Co）纳米颗粒催化剂用于甲苯和苯的加氢
DOI：
10.1016/j.mcat.2020.110992
复制
发表时间：
2020
影响因子：
4.6
通讯作者：
Liu Zhongyi
中科院分区：
文献类型：
--
作者：
Yang Jingyi;Fan Yanping;Li Zhong-Li;Peng Zhikun;Yang Jing-He;Liu Baozhong;Liu Zhongyi
本文报道了一种通过同时强静电吸附（co-SEA）合成一系列负载型Pd-M/SiO2（M= Pt，Ni，Cu，Co）催化剂的有效方法，该方法通过改变相对于表面零电荷点（PZC）的pH值来控制金属前体强烈锚定在带相反电荷的载体（SiO2）上。以甲苯和苯加氢为探针反应，考察了Pd-M/SiO2催化剂的催化加氢活性。与常规干法浸渍法（coDI）制备的催化剂相比，co-SEA Pd-Ni/SiO2催化剂的苯加氢转化率（TOF）最高，为3.7 s（-1），甲苯加氢转化率（TOF）最高，为3.2 s（-1）。这是由于SEA Pd-M/SiO2表面存在大量的缺电子Pd δ（+）位，容易吸附富电子的苯和甲苯。此外，co-SEA催化剂具有良好的稳定性和重复使用性，在六个运行后的催化活性没有显着下降。
Herein, we reported an effective method to synthesis a series of supported bimetallic Pd-M/SiO2 (M= Pt, Ni, Cu, Co) catalysts with highly exposed and well-alloyed nanoparticles via simultaneous strong electrostatic adsorption (co-SEA), which controlled metal precursors strongly anchored onto the oppositely charged support (SiO2) by changing the pH relative to the surface point of zero charge (PZC). The toluene and benzene hydrogenation were used as probe reactions to evaluate the catalytic hydrogenation activity performance of the Pd-M/SiO2 catalysts. Compared to the catalysts synthesized by the common technique simultaneous dry impregnation (coDI), the co-SEA Pd-Ni/SiO2 catalyst exhibited the highest turnover frequencies (TOFs) of 3.7 s(-1) for benzene hydrogenation and 3.2 s(-1) for toluene hydrogenation. This was attributed to the large amount of electrondeficient Pd delta(+) sites on the surface of SEA Pd-M/SiO2 that easily for electron-rich benzene and toluene to adsorb. Besides, the co-SEA catalysts produced well stability and reusability without significant decrease in the catalytic activity after six runs.