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

Ceramics-Silikáty 49, (2) 138 - 141 (2005)


PREPARATION OF γ-ALUMINA FROM ALUMINUM AMINOALKOXIDES
 
Amini Mostafa M. 1, Sabounchei S. Javad S. 2, Mirnajafi Fatemeh 2, Mirzaee Mahdi 1, Sharbatdaran Maasomeh 1
 
1 Department of Chemistry, Shahid Beheshti University, Tehran 1983963113, Iran
2 Department of Chemistry, Bu-Alisina University, Hammedon, Iran

Keywords: Aluminum aminoaloxide, γ-alumina, Sol-gel, Hydrothermal
 

New aluminum aminoalkoxides, Al(OCH₂CH₂OCH₃)₂(OCH₂CH₂NH₂) (1) and Al(OCH₂CH₂OCH₃)(OCH₂CH₂)₂NH (2), were synthesized from aluminum 2-mehoxyethoxide by alcohol exchange method and after characterization by infrared, mass, ¹H and ²⁷Al NMR spectroscopes have been used as precursors for the preparation of γ-alumina by conventional and hydrothermal hydrolysis. The hydrolysis process revealed that the precursors are significantly less sensitive to hydrolysis than the parent aluminum alkoxides. Thermal analysis indicates that the gel prepared from hydrothermal hydrolysis losses about 65% weight upon heating to 800°C. The X-ray diffraction shows that in the conventional and hydrothermal hydrolysis of (1) and (2) pseudoboehmite phase forms and converts to fine γ-alumina by calcination at 800°C. The scanning electron microscopy shows that the alumina prepared by hydrothermal hydrolysis is more uniform than the powder obtained from conventional one. The prepared aluminum aminoalkoxides have good potential for casting monolithic gel by sol-gel process.


PDF (0.2 MB)
 
Licence Creative Commons © 2015 - 2024
Institute of Rock Structure and Mechanics of the CAS & University of Chemistry and Technology, Prague
Webmaster | Journal Contact