High surface area MgAl2O4 has been synthesised by a sonochemical method. Two kinds of precursors were used, alkoxides and nitrates/acetates and in both cases nanostructured MgAl2O4 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 °C transforms the as-made products into MgAl2O4 spinel phase. The surface area is up to 267 m2/g after treatment at 500 °C and 138 m2/g at 800 °C.
Sonochemical Preparation Of High Surface Area MgAl2O4 Spinel / Troia, Adriano; M., Pavese; F., Geobaldo. - In: ULTRASONICS SONOCHEMISTRY. - ISSN 1350-4177. - 16:(2009), pp. 136-140. [10.1016/j.ultsonch.2008.06.001]
Sonochemical Preparation Of High Surface Area MgAl2O4 Spinel
TROIA, ADRIANO;
2009
Abstract
High surface area MgAl2O4 has been synthesised by a sonochemical method. Two kinds of precursors were used, alkoxides and nitrates/acetates and in both cases nanostructured MgAl2O4 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 °C transforms the as-made products into MgAl2O4 spinel phase. The surface area is up to 267 m2/g after treatment at 500 °C and 138 m2/g at 800 °C.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
