Cationic and anionic metalloporphyrins simultaneously immobilized onto raw halloysite nanoscrolls catalyze oxidation reactions

Authors: Guilherme Sippel Machado, Geani Maria Ucoski, Omar José de Lima, Kátia Jorge Ciuffi, Fernando Wypych, Shirley Nakagaki

Abstract:
We simultaneously immobilized an anionic iron(III) porphyrin (FePor) and a cationic manganese(III) porphyrin (MnPor) onto raw halloysite nanoscrolls. The positive and negative residual charges at the edges ofthe halloysite nanoscrolls and the negative residual charges on the surface ofthis supportfavored FePor and MnPor immobilization. We characterized the material containing simultaneously immobilized FePor and MnPor (FeMn-Hallo) by powder X-ray diffraction, Fourier transform infrared spectroscopy, textural analysis, and UV–vis spectroscopy (solid sample); these techniques confirmed that both FePor andMnPor were present on the support.We also investigated whether FeMn-Hallo catalyzed cyclooctene epoxidation as well as cyclohexane and n-heptane oxidation. FeMn-Hallo was an effective catalyst for oxidation reaction, attesting the efficiency and versatility of both immobilized metalloporphyrins in the same support. The simultaneous immobilization of metalloporphyrins paves the way for chemists to develop multifunctional catalysts that can simultaneously promote distinct reactions.

Keywords:
Porphyrins
Halloysite
Double immobilization
Heterogeneous catalysis
Oxidation
Clay minerals

Published in: Applied catalysis A: General  (Volumes 460–461, Pages 1-132, 10 June 2013)

Publisher: Elsevier      

ISSN Information: 0926-860X

Cationic and anionic metalloporphyrins simultaneously immobilized onto raw halloysite nanoscrolls catalyze oxidation reactions

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