Synthesis of Binary Co-Mg-O Oxide System and Study of Its Behavior in Reduction/Oxidation Cycling Full article
| Journal |
International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487 |
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| Output data | Year: 2019, Volume: 44, Number: 37, Pages: 20690-20699 Pages count : 10 DOI: 10.1016/j.ijhydene.2018.05.044 | ||||||
| Tags | Sol-gel technique; nanocrystalline MgO; Cobalt oxide; Solid solutions; Reduction behavior | ||||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Federal Agency for Scientific Organizations | 0303-2016-0014 |
| 2 | Federal Agency for Scientific Organizations | 0303-2016-0002 |
Abstract:
The nanoscale Co–Mg–O oxide sample (15 wt.% in terms of Co3O4) was prepared from the corresponding xerogel synthesized by the modified sol-gel method. The hydrolysis of as-prepared Mg(OCH3)2 was carried out using the aqueous solution of Co(NO3)2 precursor. The CoOx nanocrystallites of about 10-20 nm in size were shown to be uniformly distributed within the MgO matrix. The reduction of Co–Mg–O in H2 flow was found to proceed in two separate stages within the temperature ranges of 200-350 °C and 350-600 °C. The prepared binary Co–Mg–O system was demonstrated to possess completely reproducible reduction behavior in the consecutive reduction/reoxidation cycles. The phase composition of the sample exposed to both the reducing and oxidative environment was followed by an in situ X-ray diffraction analysis performed at temperatures of 25, 300, 500 and 700 °C. The determined lattice parameters for MgO (a = 4.219 Å) and Co3O4 (a = 8.110 Å) were found to be slightly increased as compared with the values from Powder Diffraction File, so that the formation of joint non-stoichiometric (Mg1-xCox)O and (Co3 xMgx)O4 phases was suggested. The strong chemical interaction of cobalt oxide with MgO matrix was also evidenced by the data of a diffuse reflectance UV–vis spectroscopy.
Cite:
Vedyagin A.A.
, Karnaukhov T.M.
, Cherepanova S.V.
, Stoyanovskii V.O.
, Rogov V.A.
, Mishakov I.V.
Synthesis of Binary Co-Mg-O Oxide System and Study of Its Behavior in Reduction/Oxidation Cycling
International Journal of Hydrogen Energy. 2019. V.44. N37. P.20690-20699. DOI: 10.1016/j.ijhydene.2018.05.044 WOS Scopus РИНЦ ANCAN OpenAlex
Synthesis of Binary Co-Mg-O Oxide System and Study of Its Behavior in Reduction/Oxidation Cycling
International Journal of Hydrogen Energy. 2019. V.44. N37. P.20690-20699. DOI: 10.1016/j.ijhydene.2018.05.044 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Mar 9, 2018 |
| Accepted: | May 7, 2018 |
| Published online: | May 26, 2018 |
| Published print: | Aug 2, 2019 |
Identifiers:
| Web of science: | WOS:000488994100007 |
| Scopus: | 2-s2.0-85047432988 |
| Elibrary: | 41781731 |
| Chemical Abstracts: | 2018:1017218 |
| Chemical Abstracts (print): | 171:168878 |
| OpenAlex: | W2804413387 |