Synthesis of Binary Co-Mg-O Oxide System and Study of Its Behavior in Reduction/Oxidation Cycling | Sciact - CRIS-система Института катализа

Synthesis of Binary Co-Mg-O Oxide System and Study of Its Behavior in Reduction/Oxidation Cycling Научная публикация

Журнал

International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487

Вых. Данные

Год: 2019, Том: 44, Номер: 37, Страницы: 20690-20699 Страниц : 10 DOI: 10.1016/j.ijhydene.2018.05.044

Ключевые слова

Sol-gel technique; nanocrystalline MgO; Cobalt oxide; Solid solutions; Reduction behavior

Авторы

Vedyagin Aleksey A. ^1,2 , Karnaukhov Timofey M. ^1,3 , Cherepanova Svetlana V. ^1,3 , Stoyanovskii Vladimir O. ¹ , Rogov Vladimir A. ^1,3 , Mishakov Ilya V. ^1,2

Организации

1	Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russian Federation
2	National Research Tomsk Polytechnic University, 634050 Tomsk, Russian Federation
3	National Research Novosibirsk State University, 630090 Novosibirsk, Russian Federation

Информация о финансировании (2)

1	Федеральное агентство научных организаций России	0303-2016-0014
2	Федеральное агентство научных организаций России	0303-2016-0002

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.

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 CAPlusCA OpenAlex

Поступила в редакцию:	9 мар. 2018 г.
Принята к публикации:	7 мая 2018 г.
Опубликована online:	26 мая 2018 г.
Опубликована в печати:	2 авг. 2019 г.

Web of science:	WOS:000488994100007
Scopus:	2-s2.0-85047432988
РИНЦ:	41781731
Chemical Abstracts:	2018:1017218
Chemical Abstracts (print):	171:168878
OpenAlex:	W2804413387

БД	Цитирований
Scopus	16
Web of science	16
РИНЦ	13
OpenAlex	16