• 文献标题:   Mn(III)-Porphyrin Immobilized on the Graphene Oxide-Magnetite Nanocomposite as an Efficient Heterogeneous Catalyst for the Epoxidation of Alkenes
  • 文献类型:   Article
  • 作  者:   HAJIAN R, BAHRAMI E
  • 作者关键词:   graphene oxide, epoxidation, heterogeneous catalyst, magnetite, mnporphyrin, nanoparticle, uhp
  • 出版物名称:   CATALYSIS LETTERS
  • ISSN:   1011-372X EI 1572-879X
  • 通讯作者地址:  
  • 被引频次:   5
  • DOI:   10.1007/s10562-021-03827-x EA OCT 2021
  • 出版年:   2022

▎ 摘  要

In this research, beta-tetra-brominated meso-tetraphenylporphyrinatomanganese(III) acetate [MnTPPBr4(OAc)] (MnPor) was anchored onto a magnetite imidazole-modified graphene oxide nanosheet (Fe3O4.GO.Im). The obtained catalyst (Fe3O4.GO.Im@MnPor) was characterized through Fourier transform infrared (FT-IR) and diffuse reflectance UV-Visible spectrophotometry (DR UV-Vis), powder X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) spectroscopy, thermogravimetric analysis (TGA) and atomic absorption spectroscopy. The characterization was performed to determine the amount of manganese porphyrin loaded on the GO support. The new immobilized catalyst was employed for the efficient epoxidation of different alkenes with urea hydrogen peroxide (UHP) and acetic acid (HOAc) as oxidant activators under mild conditions. Olefins were oxidized efficiently to their corresponding epoxide with 63-100% selectivity in the presence of Fe3O4.GO.Im@MnPor. Moreover, an remarkable turnover frequency (93) was achieved for the oxidation of alpha-pinene. The graphene oxide-bound Mn-porphyrin was recovered from the reaction mixture by magnetic decantation and reused several times. [GRAPHICS]