Effect of the Phase Composition of Ca-Al Hydroxide Precursors on the Mayenite Formation | Sciact - CRIS-система Института катализа

Effect of the Phase Composition of Ca-Al Hydroxide Precursors on the Mayenite Formation Научная публикация

Журнал

Ceramics International
ISSN: 0272-8842

Вых. Данные

Год: 2025, DOI: 10.1016/j.ceramint.2025.05.272

Ключевые слова

Mayenite; A. Calcination; A. powders: chemical preparation; B. X-ray methods; B. Porosity

Авторы

Kapishnikov Aleksandr V. ^1,2 , Shuvarakova Ekaterina I. ¹ , Cherepanova Svetlana V. ¹ , Gerasimov Evgeny Y. ¹ , Bespalko Yulia N. ¹ , Maksimovskiy Evgeny A. ³ , Volodin Alexander M. ¹ , Bedilo Alexander F. ¹

Организации

1	Boreskov Institute of Catalysis, Novosibirsk, Russia
2	Novosibirsk State University, Novosibirsk, Russia
3	Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia

Информация о финансировании (2)

1	Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)	FWUR-2024-0034
2	Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)	FSUS-2024-0020

Specific features of the mayenite formation from hydroxide precursors with different phase compositions as well as the evolution of the surface morphology during this process were studied. The synthesis temperature was found to have a substantial effect on the phase composition of the obtained Ca-Al hydroxide precursors with Ca:Al = 6:7 stoichiometry. Practically no reaction between calcium hydroxide and aluminum oxyhydroxide was observed at 25 °C whereas synthesis at 75 °C led to crystallization of a mixed hydroxide katoite Ca3Al2(OH)12. It was demonstrated that in the latter case the decomposition of the katoite phase at 300 °C results in the formation of the mayenite phase with the 3–4 times higher yield than in the former case. When the sample formed from katoite was calcined further at 500 °C, the mayenite average crystallite size decreased from 95 to less than 30 nm. This sample featured the highest surface area of 83 m2/g with mayenite as the predominating crystalline phase. Katoite appears to be the key intermediate in the production of finely dispersed mayenite by this method. Calcination at 600–900 °C leads to gradual mayenite sintering with the decrease of the surface area and appearance of new large pores that can be easily observed in microscopic images.

Kapishnikov A.V. , Shuvarakova E.I. , Cherepanova S.V. , Gerasimov E.Y. , Bespalko Y.N. , Maksimovskiy E.A. , Volodin A.M. , Bedilo A.F.
Effect of the Phase Composition of Ca-Al Hydroxide Precursors on the Mayenite Formation
Ceramics International. 2025. DOI: 10.1016/j.ceramint.2025.05.272 Scopus

Поступила в редакцию:	4 февр. 2025 г.
Принята к публикации:	18 мая 2025 г.
Опубликована online:	19 мая 2025 г.

Scopus:

2-s2.0-105005511401

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