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Synthesis of Highly Porous Aluminas Mediated by Cationic Surfactant: Structural and Textural Properties

Published online by Cambridge University Press:  03 March 2011

J.A. Toledo ,
X. Bokhimi ,
C. Lopez ,
C. Angeles ,
F. Hernandez  and
J.J. Fripiat
J.A. Toledo
Affiliation:
Instituto Méxicano del Petróleo, Prog. de Ingeniería Molecular, Eje Central Lázaro Cárdenas # 152, A.P. 07730 México, D.F. México
X. Bokhimi
Affiliation:
Institute of Physics, The National University of Mexico, A.P. 20-364, 01000 México D.F., Mexico
C. Lopez
Affiliation:
Instituto Méxicano del Petróleo, Prog. de Ingeniería Molecular, Eje Central Lázaro Cárdenas # 152, A.P. 07730 México, D.F. México
C. Angeles
Affiliation:
Instituto Méxicano del Petróleo, Prog. de Ingeniería Molecular, Eje Central Lázaro Cárdenas # 152, A.P. 07730 México, D.F. México
F. Hernandez
Affiliation:
Instituto Méxicano del Petróleo, Prog. de Ingeniería Molecular, Eje Central Lázaro Cárdenas # 152, A.P. 07730 México, D.F. México
J.J. Fripiat
Affiliation:
Instituto Méxicano del Petróleo, Prog. de Ingeniería Molecular, Eje Central Lázaro Cárdenas # 152, A.P. 07730 México, D.F. México
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Abstract

The cationic surfactant cetyltrimetylammonium bromide was used to synthesize mesostructured γ–Al2O3. The effects of the surfactant concentration and of the sol aging (at 95 °C for 24 h) were studied by x-ray powder diffraction, nuclear magnetic resonance, transmission electron microscopy, and analysis of the low-temperature nitrogen adsorption-desorption isotherms. Mesostructured alumina with wormhole morphology and amorphous walls was obtained through the precipitation by ammonium hydroxide of a 0.1 M aluminum nitrate aqueous solution in presence of 0.1 M surfactant. The pore size was smaller than 5 nm. After digesting the milky suspension under atmospheric pressure at 95 °C, a crystallized boehmite-surfactant phase, with fiber morphology, is formed which at 550 and 700 °C is transformed into a highly porous γ−Al2O3. A similar evolution was observed using 0.01 M CTAB solution and aging. Pore volume up to 1.1 cm3/g and pore size up to 16 nm were obtained. Without surfactant, the same aging treatment led to aggregated fibers: the pore size is less than 8 nm and the pore volume is smaller than 0.6 cm3/g. The γ-alumina surface area is determined mainly by the organization generated by the surfactant and to a lesser extent by the boehmite precursor particle size. From the point of view of catalyst preparation, the surfactant at the concentration of 0.01 M in 0.1 M aluminum nitrate and the aging treatment in solution play a beneficial role.

Keywords

NanofiberNuclear magnetic resonances (NMR)X-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 2947 - 2954
Copyright
Copyright © Materials Research Society 2005

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