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Alternative Chemical Route to Mesoporous Titania From a Titanatrane Complex

Published online by Cambridge University Press:  03 March 2011

Chavalit Trakanprapai ,
Vincenzo Esposito ,
Silvia Licoccia  and
Enrico Traversa
Chavalit Trakanprapai
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, 00133 Rome, Italy
Vincenzo Esposito
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, 00133 Rome, Italy
Silvia Licoccia
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, 00133 Rome, Italy
Enrico Traversa*
Affiliation:
Department of Chemical Science and Technology, University of Rome Tor Vergata, 00133 Rome, Italy
*
a)Address all correspondence to this author. e-mail: traversa@uniroma2.it
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Abstract

High-purity, mesoporous titania was prepared by reaction of dimethylaminotitanatrane, [NMe2–Ti(OCH2CH2)3N] in the presence of micellar aggregates as templating agents followed by thermal treatments in the temperature range 350–450 °C. The powders were characterized by nitrogen adsorption–desorption isotherms, thermogravimetry–differential thermal analysis, Fourier transform infrared, field-emission scanning electron microscopy, and x-ray diffraction. Analysis of the morphological characteristics of titanium oxide powders calcined at 350 °C for 120 h and at 450 °C for 6 h showed the presence of a mesoporous structure, with an average pore size of about 3.5 nm. Firing temperatures above 450 °C caused the collapse of the mesoporous structure. Composite Nafion-based membranes, containing 5 wt% mesoporous titania fired at 450 °C as a filler were successfully prepared. Preliminary tests in a prototype direct methanol fuel cell demonstrated that the composite membrane allowed cell operation up to 145 °C, thus showing a significant performance improvement over pure Nafion.

Keywords

Chemical synthesisPowderMorphology
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 1 , January 2005 , pp. 128 - 134
Copyright
Copyright © Materials Research Society 2004

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