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Amorphous Ferromagnetic Cobalt-Boron Composition Reduced by Sodium Borohydride: Phase Transformation at Heat-Treatment and Its Influence on the Catalytic Properties Full article

Journal Colloids and Surfaces A: Physicochemical and Engineering Aspects
ISSN: 0927-7757
Output data Year: 2018, Volume: 537, Pages: 485-494 Pages count : 10 DOI: 10.1016/j.colsurfa.2017.10.052
Tags Amorphous material, Catalysis, Cobalt, Phase transition, Sodium borohydride, Thermal analysis
Authors Netskina O.V. 1,2 , Kellerman D.G. 3 , Ishchenko A.V. 1,2 , Komova O.V. 1 , Simagina V.I. 1
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Pr. Akademika Lavrentieva 5, Novosibirsk, 630090, Russia
2 Novosibirsk State University, Pirogova Str. 2, Novosibirsk, 630090, Russia
3 Institute of Solid State Chemistry UrB RAS, Pervomaiskaya Street 91, Ekaterinburg, 620219, Russia

Funding (1)

1 Federal Agency for Scientific Organizations 0303-2016-0015

Abstract: The cobalt-boron composition by reduction of cobalt chloride in an aqueous solution of sodium borohydride is an amorphous ferromagnetic black powder consisting of spherical particles covered with a shell. Transformations of cobalt-boron composition upon its heat treatment from 20 to 1000 °С in an inert atmosphere have been studied by thermal analysis, magnetic susceptibility and HR TEM. On the basis of the obtained results the heating process was divided into five temperature intervals characterized by considerable changes in the structure of cobalt-boron composition. The end products of chemical and structural transformations are cobalt metal and cobalt borates – Co2B2O5, Co3BO5, Co3(BO3)2. In our study it was shown for the first time that the metallic phase with a face-centered cubic lattice forms from the amorphous core while the cobalt borates form as a result of transformation of an oxygen-containing shell under an inert atmosphere. The study of the effect of physicochemical properties of the calcined cobalt-boron composition on the rate of NaBH4 hydrolysis has shown that it decreases with decline specific surface area of the sample and its phase composition determines the rate of formation of the catalytic active component in the reaction medium.
Cite: Netskina O.V. , Kellerman D.G. , Ishchenko A.V. , Komova O.V. , Simagina V.I.
Amorphous Ferromagnetic Cobalt-Boron Composition Reduced by Sodium Borohydride: Phase Transformation at Heat-Treatment and Its Influence on the Catalytic Properties
Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2018. V.537. P.485-494. DOI: 10.1016/j.colsurfa.2017.10.052 WOS Scopus РИНЦ AN OpenAlex
Dates:
Submitted: Aug 21, 2017
Accepted: Oct 19, 2017
Published online: Nov 5, 2017
Published print: Jan 1, 2018
Identifiers:
Web of science: WOS:000417068300056
Scopus: 2-s2.0-85032332563
Elibrary: 31082205
Chemical Abstracts: 2017:1732788
OpenAlex: W2766705350
Citing:
DB Citing
Web of science 11
Scopus 11
Elibrary 13
OpenAlex 12
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