The University of Southampton
University of Southampton Institutional Repository

Ion exchange selectivity and structural changes in highly aluminous zeolites

Record type: Article

The step-wise ion exchange replacement of sodium by either potassium or strontium has been studied for the two highly aluminous zeolites MAX (maximum aluminium X or LSX, low-silica X) and MAP (maximum aluminium P) to determine ion exchange selectivities. Powder diffraction data were gathered at different degrees of exchange and used to refine the structures of hydrated MAX exchanged with strontium (powder X-ray diffraction) or potassium (powder neutron diffraction). The cubic lattice of MAX expanded (from 25.06 angstrom to 25.15 angstrom) when 80% metal loading (K+ or Sr2+) was achieved. Concurrent measurements of ion exchange selectivity showed a sharp decrease in selectivity coefficients at 80% metal loading. These results and evaluation of earlier work indicates that structural changes (e.g. lattice expansion) may be a major cause for the strong non-ideality of ion exchange selectivity, commonly observed in high aluminium zeolites ion exchange. Changes in solution pH may also be an important factor affecting the ion exchange selectivities because the dissociation of OH-groups the weakly acidic zeolites is sensitive to solution pH.

Full text not available from this repository.

Citation

Kuronen, M., Weller, M., Townsend, R. and Harjula, R. (2006) Ion exchange selectivity and structural changes in highly aluminous zeolites Reactive and Functional Polymers, 66, (11), pp. 1350-1361. (doi:10.1016/j.reactfunctpolym.2006.03.019).

More information

Published date: 2006
Keywords: neutron-diffraction, linde x, gismondine, map, na, li, aujasite, nmr, ray

Identifiers

Local EPrints ID: 44474
URI: http://eprints.soton.ac.uk/id/eprint/44474
ISSN: 1381-5148
PURE UUID: d51d6fa0-5c89-472f-b887-dfc3694cd614

Catalogue record

Date deposited: 01 Mar 2007
Last modified: 17 Jul 2017 15:14

Export record

Altmetrics

Contributors

Author: M. Kuronen
Author: M. Weller
Author: R. Townsend
Author: R. Harjula

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×