Synthesis of macroporous ZrO2–Al2O3 mixed oxides with mesoporous walls, using polystyrene spheres as template |
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Authors: | José Ortiz-Landeros Maria Eugenia Contreras-García Heriberto Pfeiffer |
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Affiliation: | (1) Instituto de Investigaciones Metalúrgicas, UMSNH, Cd. Universitaria, CP 58000 Morelia, Michoacan, Mexico;(2) Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior s/n, Cd. Universitaria, Del. Coyoacan, CP 04510 Mexico, DF, Mexico |
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Abstract: | Macroporous ZrO2–Al2O3 mixed oxides with mesoporous walls were synthesized. The three-dimensional interconnected macroporous structures, of inorganic
zirconia–alumina mixed oxides containing different alumina compositions (25, 50, 100 wt%), were prepared by sol–gel method
from inorganic precursors and using polystyrene microspheres with diameters of 685 and 1520 nm as templates. The final porous
arrays with controllable pore size in the submicrometer range could be obtained by calcination of the organic template. The
structural characteristics are discussed. The physicochemical characterization of the samples was carried out by N2 physisorption (SBET), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission
electron microscopy (TEM). The shrinkage of pore diameter was approximately 35%, and the wall thickness of inorganic framework
varied between 135 and 154 nm. The specific surface areas, of the samples, were between 123 and 287 m2/g, obtaining the largest surface area with the highest alumina contents and the smallest templates. |
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Keywords: | Mixed oxides Macroporous Mesoporous ZrO2– Al2O3 |
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