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Synthesis of bimodally porous titania powders by hydrolysis of titanium tetraisopropoxide

Published online by Cambridge University Press:  31 January 2011

Ki Chang Song  and
Sotiris E. Pratsinis
Ki Chang Song
Affiliation:
Institute of Process Engineering, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zurich, Switzerland
Sotiris E. Pratsinis*
Affiliation:
Institute of Process Engineering, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092 Zurich, Switzerland
*
b)Address all correspondence to this author. e-mail: pratsinis@ivuk.mavt.ethz.ch
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Abstract

Bimodally porous titania powders with controlled phase composition and porosity were made by hydrolysis of titanium tetraisopropoxide (TTIP) and calcination. The extent of calcination was followed by thermogravimetric differential thermal analysis and Fourier transform infrared spectroscopy. The specific surface area (SSA) of the powders ranged from 10 to 500 m2/g as determined by nitrogen adsorption. The SSA increased by decreasing either the water concentration during hydrolysis or the calcination temperature. The pore size distribution was bimodal with fine intraparticle pore diameters at 1–6 nm and larger interparticle pore diameters at 30–120 nm as determined by nitrogen adsorption isotherms. The particle phase composition as determined by x-ray diffraction ranged from amorphous to crystalline anatase and rutile largely proportional to the calcination temperature and to a lesser extent on the initial H2O/TTIP molar ratio.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2322 - 2329
Copyright
Copyright © Materials Research Society 2000

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