Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment | Sciact - CRIS-система Института катализа

Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment Научная публикация

Журнал

Journal of Solid State Chemistry
ISSN: 0022-4596 , E-ISSN: 1095-726X

Вых. Данные

Год: 2016, Том: 233, Страницы: 294-302 Страниц : 9 DOI: 10.1016/j.jssc.2015.11.007

Ключевые слова

2D crystallites, Alumina, Debye Scattering Equation, Nanostructure, Pseudoboehmite, Supercritical drying

Авторы

Pakharukova V.P. ^1,2,3 , Shalygin A.S. ^1,2,3 , Gerasimov E.Yu. ^1,2,3 , Tsybulya S.V. ^1,2,3 , Martyanov O.N. ^1,2,3

Организации

1	Boreskov Institute of Catalysis, SB RAS, Pr. Lavrentieva 5, 630090 Novosibirsk, Russia
2	Novosibirsk State University, Pirogova Street 2, 630090 Novosibirsk, Russia
3	Research and Educational Center for Energy Efficient Catalysis, Novosibirsk State University, Novosibirsk 630090, Russia

Информация о финансировании (2)

1	Фонд «Сколково»	3 от 25.12.2014
2	Российский научный фонд	14-23-00037

Silica-modified pseudoboehmite aerogels (0, 10, 20 at % of Si) were prepared by sol-gel method followed by supercritical drying. The phase transformations, changes in structure and morphology upon calcination were thoroughly investigated by advanced X–Ray diffraction (XRD) techniques and high-resolution transmission electron microscopy (HRTEM). Obtained pseudoboehmite samples had specific nanostructure: ultrathin two-dimensional (2D) crystallites were loosely packed. The silica dopant drastically enhanced the crystallite anisotropy. Thus, the aerogel with Al:Si atomic ratio of 9:1 consisted of the pseudoboehmite nanosheets with thickness of one unit cell (average dimensions of 14.0х1.2x14.5 nm). The specific nanostructure caused remarkable features of experimental XRD patterns, including anisotropic peak broadening and appearance of forbidden reflection. Direct simulation of XRD patterns with using the Debye Scattering Equation allowed the size and morphology of pseudoboehmite crystallites to be determined. The silica addition strongly delayed formation of γ-alumina and further phase transformations upon calcinaton. Thermal stability of alumina was suggested to be affected by the particle morphology inherited from the pseudoboehmite precursor.

Pakharukova V.P. , Shalygin A.S. , Gerasimov E.Y. , Tsybulya S.V. , Martyanov O.N.
Structure and Morphology Evolution of Silica-Modified Pseudoboehmite Aerogels During Heat Treatment
Journal of Solid State Chemistry. 2016. V.233. P.294-302. DOI: 10.1016/j.jssc.2015.11.007 WOS Scopus РИНЦ CAPlusCA OpenAlex

Поступила в редакцию:	18 авг. 2015 г.
Принята к публикации:	3 нояб. 2015 г.
Опубликована online:	4 нояб. 2015 г.
Опубликована в печати:	1 янв. 2016 г.

Web of science:	WOS:000369881200042
Scopus:	2-s2.0-84946545409
РИНЦ:	24934779
Chemical Abstracts:	2015:1806910
Chemical Abstracts (print):	163:707453
OpenAlex:	W1950576901

БД	Цитирований
Web of science	35
Scopus	38
РИНЦ	35
OpenAlex	36