Abstract :
[en] In order to study the influence of the addition of silicon
alkoxides on the physico-chemical properties of alumina, several types of
alkoxides have been used as reagents during the alumina synthesis.
Different parameters were studied: (i) the chain length of the alkoxide,
tailored using either tetramethoxysilane, tetraethyl orthosilicate,
trimethoxypropylsilane or trimethoxyoctylsilane; (ii) the presence of one
or two amino groups using either 3-aminopropyltrimethoxysilane or 3-(2-
aminoethylamino)propyltrimethoxysilane. The results showed that
functionalized precursors with small chain lengths led to small and
spherical Al2O3 crystallites, corresponding to narrow size distributions
of mesopores. However, the composition and polarity of the functionalized
chain must be considered in order to obtain a correct templating. The
porosity of the samples seemed to stem exclusively from the presence of
voids between the crystallites. The incorporation of Si onto alumina was
correlated with the reactivity of the silicon precursor. Introducing Si
increased the resistance of the material to sintering processes, as shown
by a higher specific surface area and a higher purity of the γ-Al2O3
phase after treatment at 1200 °C compared to the pure alumina sample.
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