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Low-temperature synthesis, structure, sorption properties and acidity of zeolite ZSM-5статья
- Авторы: Barakov Roman, Shcherban Nataliya, Yaremov Pavel, Solomakha Vladimir, Vyshnevskyy Aleksey, Ilyin Vladimir
- Журнал: Journal of Porous Materials
- Том: 23
- Номер: 2
- Год издания: 2015
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 517
- Последняя страница: 528
- DOI: 10.1007/s10934-015-0105-8
- Аннотация: High structure-directing activity and specificity of templating action of tetrapropylammonium cations TPA+ as well as high concentration of framework-forming substances in the initial reaction mixtures contribute to the formation of zeolite ZSM-5 at relatively low temperature (100 °C) in the alkali-free media. Zeolite ZSM-5 obtained at 100 °C has higher micropore and mesopore volumes, specific surface area, less uniform micropore size distribution in comparison with ZSM-5 synthesized at 170 °C in an alkaline medium in the presence of hydrated Na+ cations. Samples synthesized at 100 °C possess a lower concentration of acid sites and broader distribution of them in strength, compared with ZSM-5 obtained at 170 °C in an alkaline medium. ZSM-5 obtained at 100 °C exhibits a high catalytic activity in the reaction of cracking of cumene, as well as a higher selectivity to propylene and styrene, in comparison with isostructural analogue obtained at 170 °C in an alkaline medium. It is assumed that the investigated alkali-free reaction mixtures and the corresponding sol-precursors of zeolite ZSM-5 containing the elements of secondary building units can be used for obtaining of micro-mesoporous aluminosilicates in the conditions of low-temperature synthesis (100 °C) by dual-template method—in the presence of molecular and micellar templates.
- Добавил в систему: Бараков Роман Юрьевич