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Citation: HAO Zhi-Xian, LIU Hui, GUO Bin, LI Hong, ZHANG Jia-Wei, GAN Li-Hua, XU Zi-Jie, CHEN Long-Wu. Sol-Gel Synthesis of Alumina Using Inorganic Salt Precursor[J]. Acta Physico-Chimica Sinica, ;2007, 23(03): 289-294. doi: 10.1016/S1872-1508(07)60021-7 shu

Sol-Gel Synthesis of Alumina Using Inorganic Salt Precursor

1.
Department of Chemistry, Tongji University, Shanghai 200092, P. R. China

Received Date: 10 August 2006
Available Online: 7 March 2007

A simple procedure based on gelatification, promoted by the ring-opening reaction of propylene oxide, was proposed for the synthesis of alumina, in which hydrated aluminium nitrate (Al(NO3)3·9H2O) was mixed with propylene oxide and gelated in ethanol solvent. After being dried and calcined under air atmosphere, a kind of amorphous alumina with a well-defined mesopores structure was obtained. The samples were characterized by BET, SEM, FT-IR, and DTA. The results of liquid nitrogen adsorption indicated that two clear peaks appeared in the pore size distribution of each sample, whereas the larger pores were inkbottle-like. The average pore size of the alumina could be controlled by tuning the molar ratio of propylene oxide to aluminium nitrate over a range of pore diameters from 2.8 to 6.0 nm. The mechanism of the gelatification was finally proposed according to the characterizations. Both pH detection and FT-IR results demonstrated that propylene oxide indeed acted as an irreversible proton scavenger that induceed inorganic aluminium ions to under hydrolysis and condensation to form the aluminium oxide framework.
- Sol-gel method,
- Mesoporous alumina,
- Propylene oxide
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