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Ironporphyrin as catalyst in ciclohexane and Baeyer-Villiger reaction

Grant number: 13/05802-8
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2013
Effective date (End): May 31, 2014
Field of knowledge:Engineering - Chemical Engineering
Principal researcher:Katia Jorge Ciuffi Pires
Grantee:Sara de Araujo Faria
Home Institution: Reitoria. Universidade de Franca (UNIFRAN). Franca , SP, Brazil

Abstract

The development of chemical processes within the green chemistry principle is what will ensure the sustainability of the environment in which we live, all recent studies show that the main features to develop an efficient technology for green oxidation catalysts is the use of easily recyclable, clean oxidants such as molecular oxygen or hydrogen peroxide, and especially without the use of additives such as co-reducers or co-oxidants and reactions must be carried out with maximum efficiency atomic heterogeneous catalysts for this active, selective and recyclables need to be better prepared and studied. Despite the great advantage of heterogeneous catalysts are limited to those that can utilize hydrogen peroxide effectively in various oxidation reactions on a large scale. Many reactions currently used by industries need to be optimized, and this can be adjusted by studying not only the reaction conditions such as the properties of heterogeneous catalysts. Two reactions of great industrial importance are the reaction of Baeyer Villiger (BV) oxidation of cyclohexane and that serve as tools for the production of value added products, these reactions still need to be improved for its application with efficiency and selectivity in the chemical industry because the processes currently used in these reactions employ toxic reagents or oxidants, resulting in the low selectivity of the products obtained. As a model of biomimetic enzymes such as monooxygenases, synthetic metalloporphyrins have been used effectively in a number of oxidation reactions, but few studies have reported its use as a catalyst in the reaction BV. Our group has pioneered reporting on these catalysts in the reaction of heterogeneous systems BV and this gives us a broad perspective studies with these biomimetic catalysts (or bioinspired). This research project aims to train qualified human resources chief and develop catalysts consisting of inorganic matrices prepared by the sol-gel route non-hydrolytic containing as active phase one ferroporfirina second generation for application in catalysis selective hydrocarbon cyclohexane and ketones reaction (BV) in order to establish ideal conditions for the use of hydrogen peroxide oxidation. It also aims to build catalysts, stable, selective and recyclable, in which the active phase remains in the system without being leached and within the principles of green chemistry. The nature of the link porfirna / support is also widely studied, as well as the influence of reaction time on the textural characteristics and subsequent catalytic activity of the same. (AU)

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