Synthesis of xeolite nanomolecular sieves of different Si/Al ratios

Sharma, Pankaj ORCID: https://orcid.org/0000-0003-2319-260X, Han, Moon Hee and Cho, Churl-Hee 2015. Synthesis of xeolite nanomolecular sieves of different Si/Al ratios. Journal of Nanomaterials 2015 , pp. 1-9. 10.1155/2015/912575

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Abstract

Nanosized zeolite molecular sieves of different Si/Al ratios have been prepared using microwave hydrothermal reactor (MHR) for their greater application in separation and catalytic science. The as-synthesized molecular sieves belong to four different type zeolite families: MFI (infinite and high silica), FAU (moderate silica), LTA (low silica and high alumina), and AFI (alumina rich and silica-free). The phase purity of molecular sieves has been assessed by X-ray diffraction (XRD) analysis and morphological evaluation done by electron microscopy. Broad XRD peaks reveal that each zeolite molecular sieve sample is composed of nanocrystallites. Scanning electron microscopic images feature the notion that the incorporation of aluminum to MFI zeolite synthesis results in morphological change. The crystals of pure silica MFI zeolite (silicalite-1) have hexagon lump/disk-like shape, whereas MFI zeolite particles with Si/Al molar ratios 250 and 100 have distorted hexagonal lump/disk and pseudo spherical shapes, respectively. Furthermore, phase pure zeolite nanocrystals of octahedron (FAU), cubic (LTA), and rod (AFI) shape have been synthesized. The average sizes of MFI, FAU, LTA, and AFI zeolite crystals are 250, 150, 50, and 3000 nm, respectively. Although the length of AFI zeolite rods is in micron scale, the thickness and width are of a few nanometers.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Additional Information:	Copyright © 2015 Pankaj Sharma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Publisher:	Hindawi
ISSN:	1687-4110
Date of First Compliant Deposit:	15 November 2022
Date of Acceptance:	28 October 2015
Last Modified:	20 May 2023 19:12
URI:	https://orca.cardiff.ac.uk/id/eprint/153546

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