Zeolite Structures of Nanometer Morphology: Small Dimensions, New Possibilities

• Published in: Mesoporous Zeolites pp. 1 - 4
• Main Authors: Pastore, Heloise de Oliveira, Cardoso, Dilson
• Format: Book Chapter
• Language: English
• Published: Germany John Wiley & Sons 2015; Wiley; John Wiley & Sons, Incorporated; Wiley‐VCH Verlag GmbH & Co. KGaA
• Subjects: Chemistry & Chemical Engineering; EMT structure; lamellar zeolite; nanometer‐sized zeolites; nanometric dimensions; Physical Chemistry; unilamellar MFI structure; zeolite structures
• ISBN: 9783527335749; 3527335749
• DOI: 10.1002/9783527673957.ch2

Nanozeolites, zeolite nanocrystals, nanosized zeolites, nanometer‐sized zeolites . . . . These are but a few denominations of zeolitic solids with only one common feature: they display at least one of the three dimensions at the nanometric scale. This chapter demonstrates that the hydrothermal stability of these zeolite particles is improved after growth at the surface of the metakaolin spheres. Zeolites X, Y, and EMT were the focus of the systematic attempts to perform the synthesis in the absence of organic additives. In contrast to the zeolite nanocrystals discussed here, the lamellar zeolites have only one of the three dimensions in the nano‐size range. Ideally, the zeolitic lamellar precursor should have already been prepared as a delaminated material. This was achieved with multilamellar and unilamellar MFI structures. The first discoveries led to a surge in the synthesis procedures and establishment of clear solutions to obtain nanocrystals of controlled characteristics.