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Ultrason Sonochem. 2009 Jan;16(1):136-40. doi: 10.1016/j.ultsonch.2008.06.001. Epub 2008 Jun 18.

Sonochemical preparation of high surface area MgAl2O4 spinel.

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1
INRIM Thermodynamic Division, Strada delle Cacce 91, 10135 Torino, Italy. a.troia@inrim.it

Abstract

High surface area MgAl(2)O(4) has been synthesised by a sonochemical method. Two kinds of precursors were used, alkoxides and nitrates/acetates and in both cases nanostructured MgAl(2)O(4) was obtained. The effect of the addition of a surfactant during the sonication, cetyl trimethyl ammonium bromide, was also investigated. In the case of alkoxides precursors the as-made product is a mixture of hydroxides of aluminium and magnesium, while with nitrates/acetates a gel is obtained after sonication, containing the metal hydroxides and ammonium nitrate. Heating at 500 degrees C transforms the as-made products into MgAl(2)O(4) spinel phase. The surface area is up to 267 m(2)/g after treatment at 500 degrees C and 138 m(2)/g at 800 degrees C.

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