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In-situ high-temperature XANES observations of rapid and reversible changes in Ti coordination in titania-silica xerogels

Mountjoy, Gavin, Pickup, David M., Wallidge, Graham, Cole, Jacqueline M., Newport, Robert J., Smith, Mark E. (1999) In-situ high-temperature XANES observations of rapid and reversible changes in Ti coordination in titania-silica xerogels. Chemical Physics Letters, 304 (3-4). pp. 150-154. ISSN 0009-2614. (doi:10.1016/S0009-2614(99)00302-4) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:16948)

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http://dx.doi.org/10.1016/S0009-2614(99)00302-4

Abstract

The height and position of the pre-edge peak in Ti K-edge X-ray absorption near-edge structure (XANES) is a sensitive indicator of the coordination of Ti. This method is used in situ to investigate Ti coordination in titania-silica xerogels with low TiO2 content. Unheated xerogels contain Ti with isolated, distorted 6-fold coordination (Ti-[6]). Initial heating causes [Ti-[6] to be rapidly converted into 4-fold coordinated Ti(Ti-[4]), which upon cooling reverts to Ti-[6]. Increased heat treatment creates more stable Ti-[4], which remains after cooling. Thus, the coordination of Ti depends on ambient conditions in addition to heat treatment. In-situ XANES is important for distinguishing different kinds of Ti-[4], and hence for understanding catalytic properties. (C) 1999 Elsevier Science B.V. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/S0009-2614(99)00302-4
Subjects: Q Science
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: I.T. Ekpo
Date Deposited: 05 Apr 2009 19:52 UTC
Last Modified: 16 Nov 2021 09:54 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/16948 (The current URI for this page, for reference purposes)
Mountjoy, Gavin: https://orcid.org/0000-0002-6495-2006
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