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In-situ high-temperature XANES observations of rapid and reversible changes in Ti coordination in titania-silica xerogels
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UNSPECIFIED (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.
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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: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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Journal or Publication Title: | CHEMICAL PHYSICS LETTERS | ||||
Publisher: | ELSEVIER SCIENCE BV | ||||
ISSN: | 0009-2614 | ||||
Official Date: | 30 April 1999 | ||||
Dates: |
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Volume: | 304 | ||||
Number: | 3-4 | ||||
Number of Pages: | 5 | ||||
Page Range: | pp. 150-154 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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