›› 2020, Vol. 22 ›› Issue (4): 73-84.
• Catalyst Research •
Abstract: In this study, the precursor 4-(4-carboxy-phenoxy) phthalonitrile (CPPN) was first bonded onto the silica gel surface modified with poly(glycidyl methacrylate) (PGMA) (PGMA/SiO2) to prepare CPPN-PGMA/SiO2, and metal phthalocyanine (MPc; M=Co, Fe, Cu, Mn) was supported on the PGMA/SiO2 surface to prepare MPc-PGMA/SiO2 by synchronous synthesis and immobilization with phthalonitrile and metal salt in the solution. The chemical composition and surface morphology were characterized by the Fourier transform infrared (FTIR) spectroscopy, UV-Vis spectroscopy, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and thermogravimetry analysis (TGA). The catalytic performance of MPc-PGMA/SiO2 in epoxidation of styrene was also investigated with molecular oxygen acting as the oxidant. The results show that MPc-PGMA/SiO2 can efficiently and selectively catalyze molecular oxygen for oxidation of styrene to styrene oxide under mild conditions. However, the catalytic activity differs substantially depending on the central metal, and a highest catalytic activity is achieved by CoPc-PGMA/SiO2. The CoPc-PGMA/SiO2 amount and temperature can also affect the catalytic oxidation of styrene, and at normal atmospheric pressure, a maximum conversion rate of styrene (99%) and selectivity of styrene oxide (53%) are obtained using 0.1 g of CoPc-PGMA/SiO2 (22.61 μmol of CoPc) at 100 ℃ for 6 h. CoPc-PGMA/SiO2 also has excellent reusability, and the conversion rate of styrene is still over 90% after 5 cycles.
poly glycidyl methacrylate,
synchronous synthesis and immobilization,
刘叶峰 吕迎 李泽宇 申越 王蕊欣. 金属酞菁的同步合成与固载及其催化分子氧氧化苯乙烯[J]. , 2020, 22(4): 73-84.
Rui-Xin WANG. Synchronous synthesis and immobilization of metal phthalocyanine for the aerobic oxidation of styrene [J]. , 2020, 22(4): 73-84.