Mayenite Synthesis from Hydroxide Precursors: Structure Formation and Active Sites on Its Surface | Sciact - CRIS-система Института катализа

Mayenite Synthesis from Hydroxide Precursors: Structure Formation and Active Sites on Its Surface Научная публикация

Журнал

Materials
ISSN: 1996-1944

Вых. Данные

Год: 2022, Том: 15, Номер: 3, Номер статьи : 778, Страниц : 11 DOI: 10.3390/ma15030778

Ключевые слова

Catalytic materials; Mayenite; Spin probe method; Surface active sites; XRD

Авторы

Kapishnikov Aleksandr V. ^1,2 , Kenzhin Roman M. ^1,2 , Koskin Anton P. ² , Volodin Alexander M. ² , Geydt Pavel V. ¹

Организации

1	Laboratory of Functional Diagnostics of Low-Dimensional Structures for Nanoelectronics, Department of Physics, Novosibirsk State University, Pirogova Str., 2, 630090 Novosibirsk, Russia
2	Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Lavrentieva, 5, 630090 Novosibirsk, Russia

Информация о финансировании (1)

Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)

FSUS-2020-0029

We studied the formation process of a mayenite structure from hydroxide precursors in different gas media. According to X-ray diffraction data, this method allows a well-crystallized mayenite (Ca12 Al14 O33 or C12A7) phase to be obtained at low (500–900◦ C) temperatures with an insignificant impurity of CaO. It was shown that the lattice parameters for C12A7 obtained in an inert atmosphere (Ar) were lower when compared with similar samples in the air. These results can be explained by the different levels of oxygen nonstoichiometry in the resulting phase. We noted that sintering and crystallization of mayenite proceeds at lower temperatures in Ar than in the air medium. We found the presence of donor and acceptor active sites on the surface of mayenite, which was detected by the spin probe method. The specific (per unit surface) concentration of such sites (2.5 × 1016 m−2 and 1.5 × 1015 m−2 for donor and acceptor sites, respectively) is comparable to that of γ-Al2 O3, which is traditionally used as catalyst support. This allows it to be used in adsorption and catalytic technologies, taking into account its high specific surface area (~30–50 m2 /g at a low synthesis temperature). © 2022 by the authors. Licensee MDPI, Basel, Switzerland.

Kapishnikov A.V. , Kenzhin R.M. , Koskin A.P. , Volodin A.M. , Geydt P.V.
Mayenite Synthesis from Hydroxide Precursors: Structure Formation and Active Sites on Its Surface
Materials. 2022. V.15. N3. 778 :1-11. DOI: 10.3390/ma15030778 WOS Scopus РИНЦ CAPlus PMID OpenAlex

Поступила в редакцию:	29 окт. 2021 г.
Принята к публикации:	17 янв. 2022 г.
Опубликована online:	20 янв. 2022 г.
Опубликована в печати:	1 февр. 2022 г.

Web of science:	WOS:000756424200001
Scopus:	2-s2.0-85123093421
РИНЦ:	48144600
Chemical Abstracts:	2022:360489
PMID (PubMed):	35160729
OpenAlex:	W4205786171

БД	Цитирований
Scopus	21
Web of science	20
РИНЦ	19
OpenAlex	21