Journal
MOLECULAR CATALYSIS
Volume 462, Issue -, Pages 114-125Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2018.09.014
Keywords
Alumina; Immobilization; Aminoiron(III) porphyrin; Sol-gel process; Heterogeneous oxidation catalysis
Categories
Funding
- Spanish Ministry of Education, Science and Sports [PHBP14/00003]
- CAPES [317/15]
- Universidad de Salamanca [2016/50322-2]
- FAPESP [2016/50322-2]
- Brazilian research funding agency Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [311767/2015-0, 2012/08618-0, 2013/19523-3, 2016/01501-1]
- Brazilian research funding agency Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Brazilian research funding agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [13/19523-3] Funding Source: FAPESP
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An aminoiron(III) porphyrin immobilized on an alumina matrix was prepared and used as catalyst for the oxidation of organic substrates. Powder alumina had been prepared by a non-hydrolytic sol-gel method through condensation of aluminum chloride with anhydrous ethanol. Then, iron(III) [5,10,15,20-tetrakis(2,6-dichloro-3-aminophenyl)-porphyrin] was immobilized on the alumina powder under magnetic stirring, reflux, and inert atmosphere. Ultraviolet-visible and infrared spectroscopies, powder X-ray diffraction, scanning electron microscopy and thermal analysis were applied for characterizing the resulting material, confirming that the ironporphyrin was immobilized on the alumina support. The catalytic activity of ironporphyrin/alumina was evaluated in the oxidation of (Z)-cyclooctene and cyclohexane and in the Baeyer-Villiger oxidation of cyclohexanone using iodosylbenzene or hydrogen peroxide as oxygen donors. The novel immobilized catalyst proved to be a promising system for the efficient and selective oxidation of the organic substrates with 85-92% selectivity to the epoxide in the oxidation of alkenes and 25-41% to the ketone in the oxidation of cyclohexane. As for the Baeyer-Villiger oxidation of cyclohexanone, good conversion to c-caprolactone was observed as well. The material is a reusable heterogeneous catalyst, which makes it more economically feasible than its homogeneous counterpart.
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