Total number
Full text
Total number
Full text
Number of local repositories
Full text
0217U003964,
0117U003205
,
Synergistic organic catalytic systems «N-hydroxyimides – metallic nanoparticles» in the oxidation of organic substrates by molecular oxygen
Opeyda Yosyp Oleksijovych,
31-10-2017
LM.Litvinenko Institute of Physical Organic and Coal Chemistry
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.
Гринда Юрій Миколайович
Киця Андрій Романович
Кущ Ольга Василівна
Мідяна Галина Григорівна
Побігун-Галайська Олена Ігорівна
Хавунко Оксана Юліанівна
2020-04-02
Updated: 2026-01-08
Saving a scientific data set occurs in two stages:
1.) Creating a data set
Enter the name of the set, a brief description of the set (annotation), and click the “Create set” button. After that, a draft data set will be automatically created, which you can save for further work with the set. The system will redirect you to the “Data set information” page.
2.) Filling in the data
On the “Data set information” page, you need to fill in all the fields related to the data set and upload the files.
Please note! Each file is uploaded separately. This is done to ensure the stable operation of the system.
Once you have filled in the information about the scientific data set and added the necessary files, you can save the draft or send the data to the system.
Please note! Once the data has been sent, you cannot change it.
Drafts are necessary for storing the data set and editing it before sending.
All accounts on the NRA website go through a standard registration procedure and are verified. However, in order to obtain additional features, such as publishing open reviews of academic texts, verification by affiliation is required.
To obtain the status “verified”, you must change your primary email address to a corporate one, which is tied to a scientific or educational institution.
For example: user@ukrintei.ua, user@nas.gov.ua
After confirming your corporate email address, your account will be automatically verified by affiliation.
If your email address is corporate, but your account does not have a verification mark, you need to write to us at the email address NRAT@ukrintei.ua. After verification, we will add your address to the database, and your account will be verified.
After completing the verification procedure for affiliation, you can change the primary email address to a convenient one for you, without losing your status during the current verification.
You only need to verify for affiliation once.
* We use corporate addresses from the Unified State Database on Education and the State Register of Scientific Institutions Supported by the State
To search for news published on the official website of NRАT in the “News” section, you need to enter one word, several words, or an exact phrase in the search field. Different terms are separated by spaces.
The search is performed everywhere – in the title and the news text.
For a more comprehensive result, it is recommended to use word stems (parts of words without endings).
When using multiple words for the search, they are combined using one of the logical methods described below.
By default, the logical connector “and” is used. In this case, search results will include all news releases that contain the specified words, even if they are located separately from each other and are in different parts of the text.
Example: Search phrase: OECD report. Search result: all news containing the words “report” and “OECD” in the text and in the title, both together and separately.
If a phrase or phrase is enclosed in quotation marks (“), the results will include all publications where this exact phrase or phrase is found.
Example: Search phrase: “OECD report.” Search result: all news containing the exact phrase “OECD report.”
If you know the publication date of the news or are interested in a specific time frame in which they were published on the website, you can select such a date or date range in the additional field that looks like a calendar. The date is entered in the format year-month-day and confirmed by clicking on the corresponding date in the calendar dropdown. You can enter a date or choose one by browsing through the calendar by months and years. By default, the interval starts from the oldest date (2018-01-23) and ends with the current date.
You can also use one or more hashtags, which are located under the search field on the right side of the “News” page.
Please note: The search for academic texts is carried out in a separate search window at the following link https://nrat.ukrintei.ua/searchdb.
