Тип публикации: статья из журнала
Год издания: 2026
Идентификатор DOI: 10.1134/S003602362660098X
Ключевые слова: mesophase, silica, Sba-15, aluminosilicate, texture, structure, morphology
Аннотация: Aluminosilicate samples of mesoporous SBA-15 were synthesized by the co-condensation method using aluminium nitrate and aluminium isopropoxide as precursors. A number of synthesis parameters were varied, in particular, acidity of the medium, Al/Si molar ratio (5 and 10%), supporting salt, and temperature. The samples were characterПоказать полностьюized by X-ray diffraction, low-temperature nitrogen adsorption–desorption, IR and NMR spectroscopy, and electron microscopy. The maximum aluminium concentration in the final product was ~5.7 mol % when aluminium isopropoxide was used as the precursor and ~2.6 mol % in the case of aluminium nitrate in an aqueous medium as the starting component. The introduction of sodium chloride into the reaction medium caused a decrease in the internal surface area and pore diameter, but did not affect the structural type of the material. According to transmission electron microscopy data, aluminium is distributed in the mesophase as small, continuous regions, which are apparently formed in the initial stage of particle formation. The inner surface of cylindrical pores has a heterogeneous composition, which is manifested in the adsorption and X-ray diffraction data of the obtained materials. An explanation was proposed for the limiting aluminium concentration in the final product for the synthesis of SBA-15 mesophase under the synthesis conditions used.
Журнал: Russian Journal of Inorganic Chemistry
Выпуск журнала: Т.71, №6
Номера страниц: 838-849
ISSN журнала: 00360236
Место издания: Moscow
Издатель: Pleiades Publishing, Ltd.