RUDN University chemists proposed a way to reduce three times the temperature for the oxidation of alkanes

RUDN University chemists proposed a way to reduce three times the temperature for the oxidation of alkanes

RUDN University chemists and their colleagues from the Russian Academy of Sciences have proposed new catalysts that allow to reduce the temperature of the oxidation reaction of alkanes three times — from 150 to 50 degrees. This significantly reduces the cost of synthesizing alcohols, aldehydes and other compounds needed, in particular, for the production of nylon and capron.

Until now, the reaction of catalytic oxidation of alkanes to alcohols, aldehydes, ketones, carboxylic acids could be carried out only at high temperatures — 150 degrees Celsius and above. Lowering the process temperature will simplify the synthesis and significantly reduce the cost of the final products. But this requires new catalysts.

Chemists Georgy Shulpin and Alexey Bilyachenko from RUDN University together with colleagues from the Russian Academy of Sciences synthesized two new organoelemental compounds with a framework structure that can significantly reduce the oxidation temperature of alkanes — from 150 to 50 degrees Celsius.

These catalysts are based on silsesquioxanes — polymeric compounds with the general formula [RSiO3/2]n, (sesqui in Latin means “one and a half”). For their synthesis, a simple two-stage scheme is used. The first structure is formed in tetrahydrofurane and contains Cu4Na4, the second in dimethylformamide and contains Cu5. RUDN University chemists studied the molecular structure of the obtained compounds, and also a structure of the supramolecular structures formed by them in crystals.

The researchers tested the catalytic activity of these compounds using them as catalysts for the oxidation reaction of hexalnethylene to cyclohexanol and cyclohexanone under the action of hydrogen peroxide in acetonitrile at 50 degrees. The conversion — the ratio of the amount of the obtained product to the theoretically possible amount — was about 25% in this reaction, which is comparable to the indicators of the traditional high-temperature method. In addition, chemists used these catalysts in the oxidation reaction of cyclohexanol to cyclohexanone and 1-phenylethanol to acetophenone under the action of tert-butyl hydroperoxide at the same temperature. The conversion in the case of cyclohexanol was about 40%, and the oxidation of 1-phenylethanol to acetophenone was almost complete. Thus, chemists took an important step to simplify the technology of the synthesis of a number of important compounds for industry.

Chemists emphasize that the production of cyclohexanone from hexalnethylene is important since from cyclohexanone adipic acid is obtained — the raw material for the production of nylon-6,6, and caprolactam — the raw material for the production of capron (nylon-6). Now in the industry, the process of synthesis of cyclohexanone from hexalnethylene is carried out at a temperature of about 150 degrees; the new method will reduce the temperature to 50 degrees.

The article is published in the journal Catalysts.

30 Jan 2018
The conference on international arbitration, where law students from European universities simulate court proceedings and alternately defend the interests of the respondent and the orator.
Scientific Conferences View all
03 Nov 2017
RUDN University organized the first 5G Summit R&D Russia on June 19 - 20, 2017
Similar newsletter View all
30 Dec
Biologists from RUDN University discovered the secret of flaxseed oil with long shelf life

Biologists from RUDN University working together with their colleagues from the Institute of Molecular Biology of the Russian Academy of Sciences and the Institute of Flax studied the genes that determine the fatty acid composition in flaxseed oil and identified polymorphisms in six of them. The team also found out what gene variations could extend the shelf life of flaxseed oil. This data can be used to improve the genetic selection of new flax breeds. The results were published in the BMC Plant Biology journal.

19 Apr
Dentists from RUDN University Presented a New Classification of Root Canal Shape Changes

Individual characteristics of the shape and cross-section of the root canal are one of the main issues for dentists. When treating a root canal, a doctor needs to properly clean it, fill it, and carry out a rebuilding procedure so that a canal is sealed. The first stage of endodontic treatment requires detailed knowledge of root canal anatomy. A team of dentists from RUDN University studied and classified various changes in root canal shapes. The new classification will help doctors avoid diagnostic errors, better select their tools, and treat patients more efficiently.

19 Apr
A chemist from RUDN developed a green catalyst for pharmaceutical and industrial chemistr

Many production facilities (e.g. plastic manufacturers, pharma companies, and others) use nanocatalysts that contain palladium—an expensive component that is not sustainably produced. A chemist from RUDN University found a way to reduce palladium consumption and to make its manufacture more eco-friendly. He developed a catalyst based on a substance that comes from plant waste. Using his invention, manufacturers could cut palladium consumption in half. Moreover, new catalysts can be reused multiple times without any decrease in efficiency.

Similar newsletter View all