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ARPN Journal of Science and Technology >> Volume 7, Issue 1, January 2017

ARPN Journal of Science and Technology


Effect of Sulfate Ion on the γ-Al2O3 Surface Area Synthesized by Homogeneous Precipitation

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Author Adrián Zamorategui, Satoshi Sugita
ISSN 2225-7217
On Pages 485-491
Volume No. 3
Issue No. 5
Issue Date June 01, 2013
Publishing Date June 01, 2013
Keywords Homogeneous precipitation, basic aluminum sulfate, pseudoboehmita, γ-Al2O3.



Abstract

Amorphous basic aluminum sulfate (BAS) was synthesized by homogeneous precipitation using an aluminum sulfate solution and ammonium bisulfate as the precipitating agent. A second neutralization in the solid/liquid phase of the BAS with ammonia solution eliminates the sulfate ions of the amorphous structure and obtains pseudoboehmite (PB) at pH 10.3 with fibrousnano-sized morphology. The structure of the PB is transformed to the amorphous structure of the gamma alumina phase (γ-Al2O3) by thermal dehydroxylation (400°C). Thus, the eliminating water in the form of hydroxides, maintained the fibrous morphology with a high specific surface area 350 m2/g. The neutralization of the BAS the second time generates a slight reduction in specific surface area to 338 m2/g. The sample of BAS, PB and γ-Al2O3 was analyzed using the techniques TGA-DTA, XRD, FTIR, EDS, TEM and adsorption/desorption of N2 gas (BET).


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