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Magnetochemistry 2017, 3(4), 42; https://doi.org/10.3390/magnetochemistry3040042

Local and Average Structural Changes in Zeolite A upon Ion Exchange

1
Department of Chemistry, University of Bath, Bath BA2 7AY, UK
2
Inorganic Chemistry Lab, South Parks Road, University of Oxford, Oxford OX1 3QR, UK
*
Author to whom correspondence should be addressed.
Received: 21 August 2017 / Revised: 6 December 2017 / Accepted: 7 December 2017 / Published: 12 December 2017
(This article belongs to the Special Issue Nuclear Magnetic Resonance Spectroscopy)
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Abstract

The infamous ‘structure–property relationship’ is a long-standing problem for the design, study and development of novel functional materials. Most conventional characterization methods, including diffraction and crystallography, give us a good description of long-range order within crystalline materials. In recent decades, methods such as Solid State NMR (SS NMR) are more widely used for characterization of crystalline solids, in order to reveal local structure, which could be different from long-range order and sometimes hidden from long-range order probes. In particular for zeolites, this opens a great avenue for characterization through studies of the local environments around Si and Al units within their crystalline frameworks. In this paper, we show that some structural modifications occur after partially exchanging the extraframework Na + ions with monovalent, Li + , K + , Rb + and NH 4 + and divalent, Ca 2 + cations. Solid state NMR is deployed to study the local structure of exchanged materials, while average stricture changes can be observed by powder diffraction (PXRD). To corroborate our findings, we also employ Fourier Transform Infrared spectroscopy (FT-IR), and further characterization of some samples was done using Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray spectroscopy (EDX). View Full-Text
Keywords: zeolite; solid state NMR; ion exchange; synthesis; characterization zeolite; solid state NMR; ion exchange; synthesis; characterization
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Price, L.; Leung, K.M.; Sartbaeva, A. Local and Average Structural Changes in Zeolite A upon Ion Exchange. Magnetochemistry 2017, 3, 42.

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