4.7 Article

Nanoarchitectural approach for synthesis of highly crystalline zeolites with a low Si/Al ratio from natural clay nanotubes

Journal

MICROPOROUS AND MESOPOROUS MATERIALS
Volume 330, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.micromeso.2021.111622

Keywords

Halloysite; Aluminosilicate nanotubes; Zeolites; Analcime; MFI

Funding

  1. Ministry of Science and Higher Education of the Russian Federation (State task of Gubkin University) [FSZE-2020-0007 (0768-2020-0007)]

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A nanoarchitectural approach using natural Al2O3·2SiO2 nanotubes as templates has been developed for the synthesis of highly crystalline zeolites. By adjusting the Si/Al ratio and changing the organic templates of halloysite, the crystalline structure and morphology of the obtained materials can be controlled.
A nanoarchitectural approach for synthesis of highly crystalline zeolites based on natural aluminosilicate nanotubes with adjustable silica to alumina ratio has been developed. A double template technique was proposed for synthesis of zeolite microcrystals with geometric morphology defined by the initial aluminosilicate nanotubes (halloysite). Remarkable and unique zeolite microcrystal shapes (submicron spheres, pompon-like systems and coffin-shaped prisms) possessing different internal structures (sodalite, analcime, mordenite, mordenite framework inverted) were obtained from halloysite by hydrothermal method. Halloysite Si/Al adjustments (acid etching, addition of extra silica or alumina) significantly affected crystalline structure and morphology of the obtained materials, while changing organic templates did not have a considerable effect.

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