Article (Scientific journals)
Physico-chemical properties of alumina supports modified with silicon alkoxides
Claude, Vincent; Mahy, Julien; Wolfs, Cédric et al.
2020In Journal of Solid State Chemistry, 282, p. 121102
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Keywords :
Sol-gel process; γ-Al2O3-SiO2 supports; silicon alkoxide; thermal treatment
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.
Disciplines :
Chemical engineering
Materials science & engineering
Author, co-author :
Claude, Vincent ;  Université de Liège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Mahy, Julien  ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Wolfs, Cédric ;  Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
Lambert, Stéphanie  ;  Université de Liège - ULiège > Department of Chemical Engineering > Nanomaterials, Catalysis, Electrochemistry
Language :
English
Title :
Physico-chemical properties of alumina supports modified with silicon alkoxides
Publication date :
February 2020
Journal title :
Journal of Solid State Chemistry
ISSN :
0022-4596
eISSN :
1095-726X
Publisher :
Elsevier, Atlanta, United States - California
Volume :
282
Pages :
121102
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 December 2019

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