Synthesis and characterization of pseudoboehmite obtained by sol-gel process
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Artigo de evento
Date
2008
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A Global Road Map for Ceramic Materials and Technologies: Forecasting the Future of Ceramics, International Ceramic Federation - 2nd International Congress on Ceramics, ICC 2008, Final Programme
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0
Authors
De Souza K.E.R.
De Miranda L.F.
Kiyohara P.K.
Terence M.C.
De Lima N.B.
Munhoz Jr. A.H.
De Miranda L.F.
Kiyohara P.K.
Terence M.C.
De Lima N.B.
Munhoz Jr. A.H.
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Volume Title
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Abstract
Pseudoboehmite was prepared by sol-gel process using aluminum nitrate as precursor. The 2n full factorial experimental design was used for studying 3 variables: temperature of synthesis, the concentration of ammonium hydroxide (wt%) and the pH adjusts of the aluminum nitrate solution with ammonium carbonate. The samples of the eight syntheses (obtained in different conditions) were characterized by: specific surface area of calcined samples (at 500° C), scanning electron microscopy, thermo gravimetric analysis (TG) and differential scanning calorimetry analysis (DSC). The samples were calcined at 1100° C during 4 hours and the X-rays powder diffraction was obtained. The results show that the DSC and TG curves are similar with the data of the literature. The X-rays powder diffraction of the samples calcined at 1100°C shows that all samples present the α-alumina structure.
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Keywords
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Alumina structure , Aluminum nitrate , Ammonium carbonate , Ammonium hydroxide , Full factorial , Powder diffraction , Pseudo-boehmite , Sol-gel synthesis , TG curves