催化作用
X射线光电子能谱
高分辨率透射电子显微镜
扫描电子显微镜
钯
材料科学
选择性
化学工程
共价有机骨架
透射电子显微镜
扫描透射电子显微镜
共价键
核化学
化学
纳米技术
有机化学
复合材料
工程类
作者
Xin Deng,Lihua Zhu,Huan Zhang,Liqing Li,Ning Zhao,Jiexiang Wang,Sameh M. Osman,Rafael Luque,Bing Hui Chen
标识
DOI:10.1016/j.envres.2022.114027
摘要
A covalent organic framework (COF) was used as the support of the catalyst in this work in order to obtain an environmentally friendly catalyst with high catalytic performance, selectivity and stability for 4-nitrophenol hydrogenation. Pd tiny particles are fixed in the cavity of COF to obtain Pd/COF catalysts, which has a quite narrow particle size distribution (5.09 ± 1.30 nm). As-prepared Pd/COF catalysts (Pd loading-2.11 wt%) shows excellent catalytic performance (conversion - 99.3%, selectivity >99.0% and turnover frequency (TOF)-989.4 h−1) for 4-nitrophenol hydrogenation under relatively mild reaction conditions of reaction temperature-40 °C and reaction pressure-3.0 MPa H2, and Pd/COF catalysts have high stability. Pd/COF catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscope (TEM), high resolution TEM (HRTEM), Brunauer-Emmett-Teller (BET), scanning TEM energy-dispersive X-ray spectroscopy (STEM-EDS) elemental analysis techniques to prove that the Pd nanoparticles are highly dispersed on the COF. Pd/COF catalysts have good stability and reusability hence with certain industrial application value.
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