Kinetics of cobalt nanopowder obtaining process by hydrogen-reduction method under non-isothermal conditions

Metallurgy and Material Science

Nanotechnologies and nanomaterials


Аuthors

Nguyen T. H.1*, Nguyen V. M.2**, Le H. N.2***, Nguyen H. 2****

1. Le Qui Don State Technical University, Quoc Viet street, Hanoi, 100000, Vietnam
2. Institute of Technology, Hanoi, 100000, Vietnam

*e-mail: htnru7@yandex.ru
**e-mail: chinhnhan88@gmail.com
***e-mail: lehaininh2003@yahoo.com
****e-mail: nguyenhuynh1586@gmail.com

Abstract

The article presents the studies of the process kinetics of obtaining nanopowder of metallic cobalt by hydrogen-reduction method under non-isothermal conditions, as well as properties analysis of the initial material and obtained products. Cobalt nanopowder was being obtained by hydrogen reduction of cobalt hydroxide nanopowder in the linear heating mode at a rate of 15°C/min within the temperature range from 25 °C to 500 °C. The Co(OH)2 nanopowder was synthesized in advance by chemical precipitation from aqueous solutions of cobalt nitrate Co(NO3)2 (10 wt. %) and alkali NaOH (10 wt. %) under conditions of continuous stirring, control of the T = 20 °C temperature and pH = 9 acidity. Kinetic parameters of the hydrogen reduction process under non- isothermal conditions were calculated by the differential-difference method using the data of thermo-gravimetric analysis and non-isothermal kinetic equation. The phase composition and structure of the samples were analyzed by the X-ray method. The specific surface area and average particle size of the powder samples were determined using the Brunauer–Emmett–Teller (BET) method by the low-temperature adsorption of nitrogen. The morphology and size of the nanoparticles were studied by scanning and transmission electron microscopy. It has been established that the process of non-isothermal hydrogen reduction of Co(OH)2 nanopowder occurs within the temperature range from 180 °C to 310 °C with a maximum rate 222.34·10-5 s-1 at a temperature of 280 °C. The dependence of the degree of conversion on еру temperature during the Co(OH)2 reduction process has been determined in the form of a mathematical function y = 0,0756·e0,0248x. The value of activation energy for the Co(OH)2 nanopowder reduction process was found to be ~45 kJ/mol, which indicates a mixed reaction mode. It was revealed that the Co(OH)2 hydroxide reduction at a temperature of 280 °C allowed to accelerating the process while ensuring the required properties of the product. The obtained metallic cobalt nanoparticles have a spherical shape with a nanometer size (about tens of nanometers) and are in a sintered state. Each of them herewith is connected to several neighboring particles by isthmuses.

Keywords:

kinetics, cobalt nanopowder, hydrogen-reduction, non-isothermal condition, difference-differential method

References

  1. Aydemir T., Golubeva N.D., Shershneva I.N., Kydralieva K.A., Dzhardimalieva G.I. Formation, structure and magnetic properties of nanocomposites obtained by Fe(III)Co(II) cocrystallized complexes thermal decomposition. Aerospace MAI Journal, 2019, vol. 26, no. 2, pp. 219-228.

  2. Klimov V.G. Implementing laser pulse buildup for GTE turbine rotor blades reconditioning process design development. Aerospace MAI Journal, 2017, vol. 24, no. 1, pp. 170-179.

  3. Bhushan B. (ed). Springer Handbook of Nanotechnology. 4th edition, Berlin, Springer-Verlag Heidelberg, 2017, 1500 p.

  4. Shevtsov D.A., Turchenko I.S. Single-winding saturable inductors in airborne secondary power supplies. Aerospace MAI Journal, 2013, vol. 20, no. 3, pp. 145-153.

  5. Zeng M., Liu Y., Zhao F., Nie K., Han N., Wang X., Huang W., Song X., Zhong J., Li Y. Metallic Cobalt Nanoparticles Encapsulated in Nitrogen-Enriched Graphene Shells: Its Bifunctional Electrocatalysis and Application in Zinc-Air Batteries. Advanced Functional Materials, 2016, vol. 26(24), pp. 4397-4404. DOI: 10.1002/adfm.201600636

  6. Nguyen V.M., Khanna R., Konyukhov Y., Nguyen T.H., Burmistrov I., Levina V., Golov I., Karunakaran G. Spark Plasma Sintering of Cobalt Powders in Conjunction with High Energy Mechanical Treatment and Nanomodification. Processes, 2020, vol. 8(5), p. 627. DOI: 10.3390/pr8050627

  7. Lapsina P.V., Dodonov V.G., Pugachev V.M., Kagakin E.I. Poluchenie ul’tradispersnogo kobal’ta vosstanovleniem kristallicheskogo karbonata kobal’ta. Vestnik Kemerovskogo gosudarstvennogo universiteta, 2012,vol. 4, no. 1, pp. 267-271.

  8. Wang Y., Nie Y., Ding W., Chen S.G., Xiong K., Qi X.Q., Zhang Y., Wang J., Wei Z.D. Unification of catalytic oxygen reduction and hydrogen evolution reactions: highly dispersive Co nanoparticles encapsulated inside Co and nitrogen co-doped carbon. Chemical Communications, 2015, vol. 51(43), pp. 8942-8945. DOI: 10.1039/C5CC02400E

  9. Farkas B., Santos-Carballal D., Cadi-Essadek A., De Leeuw N.H. A DFT+U study of the oxidation of cobalt nanoparticles: Implications for biomedical applications. Materialia, 2019, vol. 7, 100381. DOI: 10.1016/j.mtla.2019.100381

  10. Jamkhande P.G., Ghule N.W., Bamer A.H., Kalaskar M.G. Metal nanoparticles synthesis: An overview on methods of preparation, advantages and disadvantages, and applications. Journal of Drug Delivery Science and Technology, 2019, vol. 53, p. 101174. DOI: 10.1016/j.jddst.2019.101174

  11. Yanilkin V.V., Nasretdinova G.R., Osin Y.N., Salnikov V.V. Anthracene mediated electrochemical synthesis of metallic cobalt nanoparticles in solution. Electrochimica Acta, 2015, vol. 168, pp. 82-88. DOI: 10.1016/j.electacta.2015.03.214

  12. Ansari S.M., Bhor R.D., Pai K.R., Sen D., Mazumder S., Ghosh K., Kolekar Y.D., Ramana C.V. Cobalt nanoparticles for biomedical applications: Facile synthesis, physiochemical characterization, cytotoxicity behavior and biocompatibility. Applied Surface Science, 2017, vol. 414, pp. 171-187. DOI: 10.1016/j.apsusc.2017.03.002

  13. Seong G., Takami S., Arita T., Minami K., Hojo D., Yavari A.R., Adschiri T. Supercritical hydrothermal synthesis of metallic cobalt nanoparticles and its thermodynamic analysis. The Journal of Supercritical Fluids, 2011, vol. 60, pp. 113-120. DOI: 10.1016/j.supflu.2011.05.003

  14. Konyukhov Yu.V., Nguyen V.M., Ryzhonkov D.I. Kinetics of Reduction of б-Fe2O3 Nanopowder with Hydrogen under Power Mechanical Treatment in an Electromagnetic Field. Inorganic Materials: Applied Research, 2019, vol. 10(3), pp. 706-712. DOI: 10.1134/S2075113319030171

  15. Ryzhonkov D.I., Konyukhov Yu.V., Nguyen V.M. Kinetic Regularities and Mechanisms of Hydrogen Reduction of Nanosized Oxide Materials in Thin Layers. Nanotechnologies in Russia, 2017, vol. 12(11- 12), pp. 620-626. DOI: 10.1134/S1995078017060076

  16. Ryzhonkov D.I., Arsent’ev P.P., Yakovlev V.V. Teoriya metallurgicheskikh protsessov (Theory of metallurgical processes), Moscow, Metallurgiya, 1989, 392 p.

  17. Chizhikov D.M., Rostovtsev S.T. Termodinamika I kinetika protsessov vosstanovleniya metallov (Thermodynamics and kinetics of metal recovery processes), Moscow, Nauka, 1972, 183 p.

  18. Brown M.E., Dollimore D., Galwey A.K. Comprehensive chemical kinetics. Vol. 22. Reactions in the solid state. Amsterdam etc., 1980, 339 p.

  19. Kolpakova N.A., Romanenko S.V., Kolpakov V.A. Sbornik zadach po khimicheskoi kinetike (Collection of problems on chemical kinetics), Tomsk, TPU, 2008, 280 p.

  20. Schmalzried H. Chemical Kinetics of Solids. Weinheim, VCH, 1995, 700 p.

mai.ru — informational site of MAI

Copyright © 1994-2020 by MAI