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© 2018. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

Two classes of well-defined and widely studied porous materials are the microporous zeolites [1] and the mesoporous silicates known as Mobil Composition of Mater (MCM) [2]. [...]the incorporation of transition metals, such as those of group V, in these porous materials can generate materials with high catalytic activity and good selectivity [1]. Works using niobium compounds are scarce, mainly dealing with synthetic compounds where their textural properties can be modulated, in order to obtain high activity in epoxidation reactions. [...]it is understood that it is of great technological interest to obtain catalysts based on niobium compounds that can be efficiently used in selective oxidation reactions of olefins, aiming at the production of compounds of high added value that are of interest to the petrochemical industry. Different niobium catalyst synthesis methods are mentioned in the literature [16,17,18,19,20] as well as studies on the activity of these materials [21]. [...]we propose the synthesis of niobium oxyhydroxide from NbCl5 using a surfactant to increase the hydrophobicity of the catalysts in order to improve their interaction with the non-polar substrate, and we test these materials for their ability to realize the epoxidation of cyclohexene used as a model molecule. 2. Catalysts Characterization The textural properties of the materials were analyzed through a N2 adsorption/desorption isotherm that was obtained at a temperature of 77 K using a Quantachrome Autosorb IQ2 equipment and pore volumes were calculated based on the adsorption branch of the isotherm using the Barrett Joyner Halenda (BJH) method.

Details

Title
Mesoporous Niobium Oxyhydroxide Catalysts for Cyclohexene Epoxidation Reactions
Author
Padula, Izabela D; Chagas, Poliane; Furst, Carolina G; Oliveira, Luiz C A
Publication year
2018
Publication date
Jun 2018
Publisher
MDPI AG
e-ISSN
20763417
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2315522765
Copyright
© 2018. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.