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Molecules 2016, 21(3), 291; doi:10.3390/molecules21030291

Recent Advances in Solid Catalysts Obtained by Metalloporphyrins Immobilization on Layered Anionic Exchangers: A Short Review and Some New Catalytic Results

1
Laboratório de Bioinorgânica e Catálise, Departamento de Química, Centro Politécnico, Universidade Federal do Paraná (UFPR), Curitiba, Paraná 81531-990, Brazil
2
Centro de Estudos do Mar, Pontal do Paraná, Paraná, Universidade Federal do Paraná (UFPR), Paraná 83255-000, Brazil
3
Departamento de Química e QOPNA, Universidade de Aveiro, Aveiro 3810-193, Portugal
*
Author to whom correspondence should be addressed.
Academic Editors: M. Graça P. M. S. Neves and M. Amparo F. Faustino
Received: 13 January 2016 / Revised: 18 February 2016 / Accepted: 24 February 2016 / Published: 29 February 2016
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Abstract

Layered materials are a very interesting class of compounds obtained by stacking of two-dimensional layers along the basal axis. A remarkable property of these materials is their capacity to interact with a variety of chemical species, irrespective of their charge (neutral, cationic or anionic). These species can be grafted onto the surface of the layered materials or intercalated between the layers, to expand or contract the interlayer distance. Metalloporphyrins, which are typically soluble oxidation catalysts, are examples of molecules that can interact with layered materials. This work presents a short review of the studies involving metalloporphyrin immobilization on two different anionic exchangers, Layered Double Hydroxides (LDHs) and Layered Hydroxide Salts (LHSs), published over the past year. After immobilization of anionic porphyrins, the resulting solids behave as reusable catalysts for heterogeneous oxidation processes. Although a large number of publications involving metalloporphyrin immobilization on LDHs exist, only a few papers have dealt with LHSs as supports, so metalloporphyrins immobilized on LHSs represent a new and promising research field. This work also describes new results on an anionic manganese porphyrin (MnP) immobilized on Mg/Al-LDH solids with different nominal Mg/Al molar ratios (2:1, 3:1 and 4:1) and intercalated with different anions (CO32− or NO3). The influence of the support composition on the MnP immobilization rates and the catalytic performance of the resulting solid in cyclooctene oxidation reactions will be reported. View Full-Text
Keywords: porphyrin; oxidation; layered double hydroxides; layered hydroxide salts; immobilization; heterogeneous catalysis porphyrin; oxidation; layered double hydroxides; layered hydroxide salts; immobilization; heterogeneous catalysis
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Nakagaki, S.; Mantovani, K.M.; Sippel Machado, G.; Dias de Freitas Castro, K.A.; Wypych, F. Recent Advances in Solid Catalysts Obtained by Metalloporphyrins Immobilization on Layered Anionic Exchangers: A Short Review and Some New Catalytic Results. Molecules 2016, 21, 291.

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