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Hydration-Induced Thermal Behavior of Crystalline and Amorphous Dispersed Alumina Научная публикация

Журнал Thermochimica Acta
ISSN: 0040-6031 , E-ISSN: 1872-762X
Вых. Данные Год: 2021, Том: 706, Номер статьи : 179066, Страниц : 6 DOI: 10.1016/j.tca.2021.179066
Ключевые слова Infrared thermography; Amorphous and crystalline alumina; Excess thermal effect; Hydration; Alumina phase composition; XRD
Авторы Vainer Boris G. 1,2 , Volodin Alexander M. 3 , Shepelin Artem V. 2
Организации
1 Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk 630090, Russia
2 Novosibirsk State University, Novosibirsk 630090, Russia
3 Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russia

Информация о финансировании (1)

1 Российский фонд фундаментальных исследований 18-08-00956 (АААА-А18-118012590013-9)

Реферат: Dispersed alumina is one of the main materials used in adsorption and catalytic technologies. However, some poorly controlled factors (exposure to the atmosphere, etc.) can change the oxide phase composition and morphology. Hence, it follows that the development of robust approaches to characterizing the material structure is a topical problem. In this study, the ability of high-performance quantitative infrared thermography (QIRT) to identify the amorphous phase in polymorphic alumina by the analysis of hydration-dehydration-induced thermal effects is demonstrated. The QIRT-obtained findings were verified by a comparison with the XRD patterns measured on the same samples. It is revealed that, in a humid atmosphere, the solid-state exothermic chemical reaction of the oxide transformation into crystalline hydroxide takes place, and, unlike crystalline alumina, the amorphous one produces a pronounced excess heating in this process. Moreover, it is found that the pseudoboehmite phase formation during the rehydration process occurs exclusively due to the amorphous alumina interaction with water. It is shown for the first time that the high-throughput express diagnostics realized using QIRT allows us to determine the amorphous phase content in dispersed alumina and, potentially, in other materials for which this problem is relevant.
Библиографическая ссылка: Vainer B.G. , Volodin A.M. , Shepelin A.V.
Hydration-Induced Thermal Behavior of Crystalline and Amorphous Dispersed Alumina
Thermochimica Acta. 2021. V.706. 179066 :1-6. DOI: 10.1016/j.tca.2021.179066 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
Поступила в редакцию: 6 авг. 2021 г.
Принята к публикации: 28 сент. 2021 г.
Опубликована online: 2 окт. 2021 г.
Опубликована в печати: 1 дек. 2021 г.
Идентификаторы БД:
Web of science: WOS:000716449100010
Scopus: 2-s2.0-85116582816
РИНЦ: 47511528
Chemical Abstracts: 2021:2217293
Chemical Abstracts (print): 176:477892
OpenAlex: W3201978696
Цитирование в БД:
БД Цитирований
Scopus 5
Web of science 5
РИНЦ 6
OpenAlex 5
Альметрики: