TY - JOUR
T1 - Effect of preparation conditions on the porous properties of coprecipitated Al2O3-SiO2 xerogels synthesized from aluminium nitrate nonahydrate and tetraethylorthosilicate
AU - Okada, Kiyoshi
AU - Tomita, Takahiro
AU - Kameshima, Yoshikazu
AU - Yasumori, Atsuo
AU - Yano, Toyohiko
AU - MacKenzie, Kenneth J.D.
N1 - Funding Information:
A part of this work was financially supported by the Japan Society for the Promotion of Science (Project: Preparation of Advanced Inorganic Materials by Soft, Solution Processing). KJDM is indebted to the Royal Society of New Zealand for a James Cook Research Fellowship under which part of this work was carried out.
Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2000/6
Y1 - 2000/6
N2 - Amorphous aluminosilicate xerogels of 9.4 mol% (15 mass%) Al2O3 composition were prepared by coprecipitation under various preparation conditions to investigate their effect on the porous properties of the xerogels. The precipitates were synthesized by coprecipitation of an ethanol solution of aluminium nitrate nonahydrate (ANN) and tetraethylorthosilicate (TEOS) using conc. NH4OH as the precipitant. The xerogels were obtained by drying and calcining the precipitate at 300°C for 4 h. Various synthesis conditions were tried, such as changes in the precipitation method, concentration of total (ANN + TEOS), H2O/TEOS ratio, the mixing time of the ANN and TEOS solutions, and the amount of NH4OH added. Of these experimental parameters, the H2O/TEOS ratio and mixing time of the ANN and TEOS solutions exerted the greatest influence on the porous properties. The specific surface area, total pore volume and pore radius of the xerogels ranged from 123 to 455 m2 g-1, from 0.31 to 1.17 ml g-1 and from 1.8 to 20 nm, respectively. These porous properties could readily be controlled by controlling the preparation conditions of the xerogels. (C) 2000 Elsevier Science B.V. All rights reserved.
AB - Amorphous aluminosilicate xerogels of 9.4 mol% (15 mass%) Al2O3 composition were prepared by coprecipitation under various preparation conditions to investigate their effect on the porous properties of the xerogels. The precipitates were synthesized by coprecipitation of an ethanol solution of aluminium nitrate nonahydrate (ANN) and tetraethylorthosilicate (TEOS) using conc. NH4OH as the precipitant. The xerogels were obtained by drying and calcining the precipitate at 300°C for 4 h. Various synthesis conditions were tried, such as changes in the precipitation method, concentration of total (ANN + TEOS), H2O/TEOS ratio, the mixing time of the ANN and TEOS solutions, and the amount of NH4OH added. Of these experimental parameters, the H2O/TEOS ratio and mixing time of the ANN and TEOS solutions exerted the greatest influence on the porous properties. The specific surface area, total pore volume and pore radius of the xerogels ranged from 123 to 455 m2 g-1, from 0.31 to 1.17 ml g-1 and from 1.8 to 20 nm, respectively. These porous properties could readily be controlled by controlling the preparation conditions of the xerogels. (C) 2000 Elsevier Science B.V. All rights reserved.
KW - Aluminosilicate xerogel
KW - Porous properties
KW - Preparation condition
KW - Rapid coprecipitation
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U2 - 10.1016/S1387-1811(99)00280-2
DO - 10.1016/S1387-1811(99)00280-2
M3 - Article
AN - SCOPUS:0034043529
SN - 1387-1811
VL - 37
SP - 355
EP - 364
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 3
ER -