催化作用
超顺磁性
扫描电子显微镜
解吸
傅里叶变换红外光谱
吸附
材料科学
选择性
红外光谱学
核化学
透射电子显微镜
化学
化学工程
无机化学
有机化学
纳米技术
磁化
磁场
物理
工程类
复合材料
量子力学
作者
Qingyuan Li,Sai Jiang,Shengfu Ji,Shi Da,Junlei Yan,Yanxia Huo,Qingmin Zhang
摘要
Novel magnetic Cu-BTC@SiO2@Fe3O4 catalysts were synthesized by encapsulating magnetic SiO2@Fe3O4 nanoparticles into Cu-BTC through an in situ method. The structure of the catalysts was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, a vibration sample magnetometer (VSM), N2 adsorption/desorption, and NH3-temperature programed desorption (NH3-TPD). The catalytic activity and recovery properties of the catalysts for the Pechmann reaction of 1-naphthol (NP) with ethyl acetoacetate (EAA) were evaluated. The results showed that the magnetic Cu-BTC@SiO2@Fe3O4 catalysts had the larger surface areas, suitable superparamagnetism, and good catalytic activity for Pechmann reaction. The conversion of 1-naphthol can reach ∼96%, and the selectivity of the production can reach ∼98% over 50.8% Cu-BTC@SiO2@Fe3O4 (MCC-10) catalyst under the reaction conditions of 130 °C and 24 h. After the reaction, the catalyst can be easily separated from the reaction mixture by an external magnet. The recovery catalyst can be reused for five times, and the conversion of 1-naphthol can be kept over 90%.
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