caa a22 4500 445388153 CHVBK 20180317143038.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s11144-011-0316-1 doi (NATIONALLICENCE)springer-10.1007/s11144-011-0316-1 The catalytic activity of poly( N -vinylimidazole)/SiO2-supported metalloporphyrins in ethyl benzene oxidation [Elektronische Daten] [Ruixin Wang, Hailin Zhu, Baojiao Gao] In this paper, novel kind of supports for immobilizing metalloporphyrin catalysts, poly(N-vinylimidazole)/SiO2 (PVI/SiO2) were prepared in the manner of "grafting from”. Then, various metalloporphyrins (MPs), such as cobalt, iron and manganese tetraphenylporphyrins (CoTPP, FeTPP, MnTPP), cobalt tetra (para-nitrophenyl) porphyrin (CoTNPP), and cobalt tetra (para-chlorophenyl) porphyrin (CoTClPP), were immobilized on the supports PVI/SiO2 via the axial coordination reaction between MPs and the imidazole groups of the grafted PVI, resulting in the heterogenized catalysts MPs-PVI/SiO2. The supported catalysts were characterized by IR and UV-Vis spectra. The catalytic performances of MPs-PVI/SiO2 for the oxidation of ethyl benzene in the absence of any reductant and solvent were investigated and compared in detail. The experimental results revealed that MPs-PVI/SiO2 could effectively activate dioxygen, and obviously catalyze the oxidation of ethyl benzene to acetophenone. The catalytic activities of MPs-PVI/SiO2 increased with increase of the electron-deficient degree of the peripheral substituent attached to the benzene ring outside the porphyrin ring. The catalytic activities of MPs-PVI/SiO2 differed among the different metals and the different substitutional groups according to the following sequences: Co(II)>Fe(III)>Mn(III), and CoTNPP>CoTClPP>CoTPP. In comparison, the catalytic activity of CoTNPP-PVI/SiO2 was the best. Under the reaction conditions of 120°C and the ordinary pressure of oxygen, the catalyst CoTNPP-PVI/SiO2 gave wonderful results with 33.4mol% yield of acetophenone. Akadémiai Kiadó, Budapest, Hungary, 2011 Substituted metalloporphyrin nationallicence Immobilization nationallicence Poly( N -vinylimidazole) nationallicence Silica gel nationallicence Biomimetic catalysis nationallicence Ethyl benzene nationallicence Wang Ruixin Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut Zhu Hailin Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut Gao Baojiao Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/2(2011-08-01), 431-441 1878-5190 103:2<431 2011 103 11144 https://doi.org/10.1007/s11144-011-0316-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-011-0316-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Ruixin Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut NATIONALLICENCE 700 1- Zhu Hailin Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut NATIONALLICENCE 700 1- Gao Baojiao Department of Chemical Engineering, North University of China, 030051, Taiyuan, People's Republic of China aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 103/2(2011-08-01), 431-441 1878-5190 103:2<431 2011 103 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer