Thermal transformations of titania hydrolysates prepared from tetraisopropoxytitanium(iv)

P A Venz; R L Frost; John R Bartlett; J L Woolfrey; J T Kloprogge

doi:10.1016/S0040-6031(99)00367-6

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Thermal transformations of titania hydrolysates prepared from tetraisopropoxytitanium(iv)

Journal article

Peer reviewed

Thermal transformations of titania hydrolysates prepared from tetraisopropoxytitanium(iv)

P A Venz, R L Frost, John R Bartlett, J L Woolfrey and J T Kloprogge

Thermochimica Acta, Vol.346(1-2), pp.73-82

2000

DOI: https://doi.org/10.1016/S0040-6031(99)00367-6

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Abstract

Analytical Chemistry

dehydration

dehydroxylation

differential thermal analysis

differential thermogravimetric analysis

titania

thermogravimetric analysis

tetraisopropoxytitanium(iv)

Titania hydrolysates prepared from the hydrolysis of both unmodified and modified tetraisopropoxytitanium(iv) are shown by both FT-Raman spectroscopy and X-ray diffraction to be amorphous with no long range ordering. The Raman hydrolysate spectra show three broad bands, consisting of multiple components, at Raman shifts of ~210, 440 and 570cm-1. These bands do not correspond with any known phase of titania. Thermal analysis shows broad endothermic peaks centred at 106-136°C and extending to ≥200°C for each of the hydrolysates and is attributed to dehydration and loss of water. Strong, broad exothermic peaks are observed in the modified hydrolysate curves, in the 310-340°C temperature range and are attributed to the combustion of the residual surface adsorbed organics. Weight loss occurred during these exotherms. Crystallisation of the disordered hydrolysates into anatase occurs in the 500-600°C temperature range. The anataseâ†’rutile phase transition was found between 665°C and 691°C.

Details

Title: Thermal transformations of titania hydrolysates prepared from tetraisopropoxytitanium(iv)
Authors: P A Venz (Author) - Queensland University of Technology
R L Frost (Author) - Australian Nuclear Science and Technology Organisation
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation
J L Woolfrey (Author) - Australian Nuclear Science and Technology Organisation
J T Kloprogge (Author) - Queensland University of Technology
Publication details: Thermochimica Acta, Vol.346(1-2), pp.73-82
Publisher: Elsevier BV
Date published: 2000
DOI: 10.1016/S0040-6031(99)00367-6
ISSN: 0040-6031
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99448738202621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Chemistry, Analytical; Chemistry, Physical; Thermodynamics