Synthesis of binary Co–Mg–O oxide system and study of its behavior in reduction/oxidation cycling

Aleksey A. Vedyagin, Timofey M. Karnaukhov, Svetlana V. Cherepanova, Vladimir O. Stoyanovskii, Vladimir A. Rogov, Ilya V. Mishakov

Результат исследований: Материалы для журналаСтатья

1 цитирование (Scopus)

Выдержка

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.

Язык оригиналаАнглийский
Страницы (с-по)20690-20699
Число страниц10
ЖурналInternational Journal of Hydrogen Energy
DOI
СостояниеОпубликовано - 2 авг 2019

Отпечаток

Oxidation
oxidation
cycles
Oxides
oxides
synthesis
Nanocrystallites
Xerogels
xerogels
cobalt oxides
matrices
files
diffraction
Phase composition
X ray diffraction analysis
Sol-gel process
Lattice constants
hydrolysis
Hydrolysis
Cobalt

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Цитировать

Synthesis of binary Co–Mg–O oxide system and study of its behavior in reduction/oxidation cycling. / Vedyagin, Aleksey A.; Karnaukhov, Timofey M.; Cherepanova, Svetlana V.; Stoyanovskii, Vladimir O.; Rogov, Vladimir A.; Mishakov, Ilya V.

В: International Journal of Hydrogen Energy, 02.08.2019, стр. 20690-20699.

Результат исследований: Материалы для журналаСтатья

Vedyagin, Aleksey A. ; Karnaukhov, Timofey M. ; Cherepanova, Svetlana V. ; Stoyanovskii, Vladimir O. ; Rogov, Vladimir A. ; Mishakov, Ilya V. / Synthesis of binary Co–Mg–O oxide system and study of its behavior in reduction/oxidation cycling. В: International Journal of Hydrogen Energy. 2019 ; стр. 20690-20699.
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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 {\AA}) and Co3O4 (a = 8.110 {\AA}) 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.",
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author = "Vedyagin, {Aleksey A.} and Karnaukhov, {Timofey M.} and Cherepanova, {Svetlana V.} and Stoyanovskii, {Vladimir O.} and Rogov, {Vladimir A.} and Mishakov, {Ilya V.}",
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AU - Vedyagin, Aleksey A.

AU - Karnaukhov, Timofey M.

AU - Cherepanova, Svetlana V.

AU - Stoyanovskii, Vladimir O.

AU - Rogov, Vladimir A.

AU - Mishakov, Ilya V.

PY - 2019/8/2

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N2 - 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.

AB - 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.

KW - Cobalt oxide

KW - Nanocrystalline MgO

KW - Reduction behavior

KW - Sol-gel technique

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