Hierarchical macro-mesoporous structures in the system TiO{sub 2}-Al{sub 2}O{sub 3}, obtained by hydrothermal synthesis using Tween-20 as a directing agent

Journal Article · Tue Dec 15 00:00:00 EST 2009 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2009.08.003· OSTI ID:22066155

Garcia-Benjume, M L ^[1]; Espitia-Cabrera, M I ^[2]

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1. Instituto de Investigaciones Metalurgicas, Universidad Michoacana de San Nicolas de Hidalgo, Edificio 'U', C.U. C.P. 58060. Morelia, Mich. (Mexico)
2. Facultad de Ingenieria Quimica, Universidad Michoacana de San Nicolas de Hidalgo, Edificio 'U', C.U. C.P. 58060. Morelia, Mich. (Mexico)

Macro-mesoporous powders of titania, alumina, and mixed titania-20%alumina systems were obtained by hydrothermal synthesis employing surfactant Tween-20 as structural directing agent in order to promote the textural properties of titania. The effect of the alumina in the titania phase and on textural properties was analyzed. The obtained powders presented a macroporous channel structure that was characterized by X-ray diffractometry, scanning and transmission electron microscopy, N{sub 2} adsorption-desorption analysis, pore size distribution, Fourier transform infrared spectrometry, and thermogravimetric analysis. It was found that alumina content retarded the anatase phase crystallization and increased the Brunauer-Emmet-Teller surface area from 136 to 210 m{sup 2}/g. The powders calcined at 400 deg. C are thermally stable and possess an interconnected macro-mesoporous hierarchical structure; the results indicate that this synthesis can be employed to prepare mixed titania-alumina with good textural properties.

• OSTI ID: 22066155
• Journal Information: Materials Characterization, Vol. 60, Issue 12; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTROSCOPY
ADSORPTION
ALUMINIUM OXIDES
CRYSTALLIZATION
DESORPTION
FOURIER TRANSFORMATION
HYDROTHERMAL SYNTHESIS
MICROSTRUCTURE
NANOSTRUCTURES
POWDERS
SURFACE AREA
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION