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Registration Number

0217U003964, 0117U003205 , R & D reports

Title

Synergistic organic catalytic systems «N-hydroxyimides – metallic nanoparticles» in the oxidation of organic substrates by molecular oxygen

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Head

Opeyda Yosyp Oleksijovych,

Registration Date

31-10-2017

Organization

LM.Litvinenko Institute of Physical Organic and Coal Chemistry

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The aim of research was to study the catalytic properties of mono- and bimetallic nanoparticles based on the d-elements to develop new selective catalytic systems with synergistic action "N-hydroxyimides – metallic nanoparticles" for the processes of oxidation of organic substrates. Object of study - catalytic systems based on mono- and bimetallic nickel, silver and copper nanoparticles and N-hydroxyphtalimide for oxidation of organic substrates by molecular oxygen. Methods - kinetic, X-ray studies, electron microscopy. As a result of the studies, practically monodisperse nickel nanoparticles of 140 ± 40 nm in size, as well as bimetallic nanoparticles Ni4Cu, Ni3Cu and NiCu with a size of 25-70 nm were synthesized. It is established that the nanopowders obtained consist of two phases - a solution of copper in nickel and a solution of nickel in copper and contain no oxides. The bimetallic nanoparticles Ni@Ag of the "Core-Shell" type with a silver shell thickness of 3-7 nm and a silver content of 10% by weight were synthesized by the contact reduction method. The catalytic activity of the obtained nanomaterials were studied using the reaction of the initiated oxidation of cumene with molecular oxygen and the dependence of the reaction rate on the surface area of ??the nanocatalysts and their nature is shown. It has been established that nanoparticles Ni3Cu and NiCu are the most effective among the studied catalysts for the oxidation of cumene. The method of computer simulation established the boundaries of the fulfillment of the stationarity conditions in the case of catalysis of oxidation processes by systems containing N-hydroxyphthalimide, that is, the boundaries where one can apply instead of the systems of differential equations of the algebraic system for analyzing the kinetics of oxidation. A significant catalytic activity of the system is shown with a combination of catalysts: microparticles of metals - N-hydroxyphthalimide, where individual catalysts act in different stages of the radical chain process: NHPI - in the chain propagation stage, and metallic microparticles - in the initiation stage.

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Гринда Юрій Миколайович
Киця Андрій Романович
Кущ Ольга Василівна
Мідяна Галина Григорівна
Побігун-Галайська Олена Ігорівна
Хавунко Оксана Юліанівна

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2020-04-02