Search

Your search keyword '"Varfolomeev M."' showing total 7 results
Start Over Author "Varfolomeev M." Topic pyrolysis
7 results on '"Varfolomeev M."'

2. Synthesis, Properties, and Pyrolysis of Organoalumoxanes Modified with Refractory Metals.

Author

Shcherbakova, G. I., Pokhorenko, A. S., Krivtsova, N. S., Varfolomeev, M. S., Apukhtina, T. L., Drachev, A. I., Ashmarin, A. A., and Storozhenko, P. A.

Subjects
HEAT resistant alloys, CERAMIC powders, ZIRCONIUM, PYROLYSIS, CHROMIUM, METAL powders
Abstract

Organoalumoxane oligomers modified with refractory metals (zirconium, hafnium, or chromium) were synthesized. Their physicochemical and fiber-forming properties were studied. Models of the group and elemental composition of oligomeric molecules of organoalumoxanes containing zirconium, hafnium, or chromium were proposed. Based on the results of X-ray diffraction and SEM analyses, it was found that pyrolysis of metal-containing organoalumoxanes at 1500°C in air results in the microcrystalline ceramic powders of corundum composition, modified with refractory metal oxides. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

4. Thermal analysis and calorimetric study of the combustion of hydrolytic wood lignin and products of its pyrolysis

Author

Varfolomeev M., Grachev A., Makarov A., Zabelkin S., Emel'yanenko V., Musin T., Gerasimov A., and Nurgaliev D.

Subjects
Differential scanning calorimetry, Combustion calorimetry, Thermogravimetry, Calorific value, Lignin, Pyrolysis
Abstract

© 2015 Springer Science+Business Media New York. Thermal decomposition of hydrolyzed lignin is studied in the 300-700°C range in an inert gas atmosphere. The yields of solid, liquid, and gaseous decomposition products are determined. It is demonstrated by combustion calorimetry that the carbonaceous residue of lignin pyrolysis has the highest calorific value. The calorific value of the carbonaceous residue of pyrolysis resin is higher than that of the original lignin. It is shown by thermogravimetry and differential scanning calorimetry with mass spectrometric detection of gases that lignin and its thermal decomposition products could undergo thermolysis with formation of various volatile compounds. Thermal decomposition starts at roughly the same temperature and is 320°C. The loss of sample mass increases in the following sequence: carbonaceous residue < lignin < liquid fraction.

Published
2015

5. Joint Thermal Treatment of Heavy Oil and Liquid Products of Fast Wood Pyrolysis for Producing Fuels and Chemicals.

Author

Grachev, A., Varfolomeev, M., Emel'yanov, D., Zabelkin, S., Gilfanov, M., and Nuriyakhmetov, R.

Subjects
*HEAVY oil, *PYROLYSIS, *CHEMICAL decomposition, *BIOMASS, *CRACKING process (Petroleum industry)
Abstract

Joint thermal treatment of heavy oil and liquid products of fast wood pyrolysis is investigated. Thermal analysis shows that the coke yield does not increase if the liquid products are added up to 20 mass%. The liquid wood-pyrolysis products decompose much earlier than heavy oil. However, the decomposition of the blends is essentially the same as pure-oil decomposition. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

6. Preceramic nanohafniumoligocarbosilanes.

Author

Shcherbakova, G., Blokhina, M., Storozhenko, P., Zhigalov, D., Sidorov, D., Apukhtina, T., Varfolomeev, M., Kuznetsova, M., and Yurkov, G.

Subjects
SILANE, CERAMIC materials, CHEMICAL reactions, PYROLYSIS, AMIDES, NANOSTRUCTURED materials
Abstract

We report the synthesis of fiber-forming nanohafniumoligocarbosilanes through reaction between oligocarbosilanes and hafnium alkylamides: Hf[N(CH)] and Hf[N(CH)]. The composition and properties of the nanohafniumoligocarbosilanes and their pyrolysis products have been studied by advanced physicochemical characterization techniques. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

7. Synthesis of organoyttroxanealumoxanesiloxanes and preparation of glass and glass-ceramics on their base.

Author

Shcherbakova, G., Storozhenko, P., Kutinova, N., Krivtsova, N., Varfolomeev, M., Movchan, T., Sidorov, D., Kuznetsova, M., Kuznetsova, T., Yurkov, G., and Ashmarin, A.

Subjects
SILOXANES, CHEMICAL sample preparation, GLASS-ceramics, ORGANIC solvents, PYROLYSIS, ORGANIC synthesis
Abstract

We report the first synthesis of organoyttroxanealumoxanesiloxanes soluble in organic solvents. Their pyrolysis yields transparent glass-ceramic materials with a predetermined Al : Y : Si molar ratio [1]. We have studied the composition and properties of the organoyttroxanealumoxanesiloxanes and their pyrolysis products. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results