ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 50, (1) 22 - 26 (2006)


HYDROUS ALUMINIUM-OXIDES PREPARED BY HOMOGENEOUS PRECIPITATION FROM ALUMINIUM(III)SULPHATE WITH UREA
 
Lukáč Jozef, Bakardjieva Snejana, Štengl Václav, Szátmáry Lórant, Šubrt Jan
 
Institute of Inorganic Chemistry AS CR, 250 68 Řež, Czech Republic

Keywords: Urea, Homogeneous precipitation, α-boehmite, Boehmite, Hydrobasaluminite
 

Easily filtrated alumina-oxides spherical precursors were prepared by homogenous precipitation from aluminium(III) sulphate with urea. Urea was employed as precipitation agent. X-Ray powder diffraction (XRD) spectra identified three different phases, namely: α-boehmite, boehmite and hydrobasaluminite. The morphology of prepared samples was observing by SEM (scanning electron microscopy) equipped with EDX (energy dispersive analysis by X-rays). The spherical clusters were examined at small concentration and the hydrobasaluminite islands were observed at the largest concentration of reagents. The microstructure characteristics were obtained by BET (Brunauer-Emmett-Teller) and BJH (Barret-Joyner-Halanda) methods. BET in wide range from 6 to 142 m²/g and the all kinds of porous distribution were acquired, respectively. These methods showed that relationship between phase structures and microstructure exists.


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