Ammonium aluminium carbonate hydroxide NH 4 Al(OH) 2 CO 3 as an alternative route for alumina preparation: Comparison with the classical boehmite precursor - Archive ouverte HAL Access content directly
Journal Articles Powder Technology Year : 2017

Ammonium aluminium carbonate hydroxide NH 4 Al(OH) 2 CO 3 as an alternative route for alumina preparation: Comparison with the classical boehmite precursor

(1, 2) , (2) , (2) , (2) , (1) , (3)
1
2
3

Abstract

Ammonium aluminium carbonate hydroxide NH 4 Al(OH) 2 CO 3 as an alternative route for alumina preparation: comparison with the classical boehmite precursor. Powder Technology, 320, 565-573, Abstract Ammonium aluminium carbonate hydroxide (AACH) is a promising alternative precursor for preparation of alumina with high purity and original textural properties. In this paper, both boehmite (classical alumina precursor) and AACH were precipitated in a stirred tank reactor with close process parameters. Preparation protocols were thus compared. Main differences between both protocols were pointed out (reactant molar ratio influence, alumina concentration, filtration / washing step). This study helps for the choice of the appropriate preparation route for alumina precursor synthesis. As-synthesized boehmite and AACH precursors were then calcined between 500 °C and 1000 °C. The textural properties of the corresponding aluminas were characterized. At 500 °C, AACH-derived alumina revealed to be particularly porous, with larger mean pore diameter (ca. 29 nm) than boehmite-derived alumina (ca.6 nm). Moreover, AACH-derived alumina exhibited a high surface area. However, a more accurate analysis revealed that this high specific surface area (407 m 2 .g-1) is mostly due to microporosity formation during the calcination step. At higher calcination temperature, boehmite and AACH-derived aluminas exhibited different behaviors against sintering. In particular, the latter showed an interesting ability to maintain a constant mean pore diameter, regardless of the calcination temperature.
Fichier principal
Vignette du fichier
2017 Powder Tech. R. Lafficher et al. author copy.pdf (1.51 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01654472 , version 1 (04-12-2017)

Identifiers

Cite

Robin Lafficher, Mathieu Digne, Fabien Salvatori, Malika Boualleg, Didier Colson, et al.. Ammonium aluminium carbonate hydroxide NH 4 Al(OH) 2 CO 3 as an alternative route for alumina preparation: Comparison with the classical boehmite precursor. Powder Technology, 2017, 320, pp.565 - 573. ⟨10.1016/j.powtec.2017.07.080⟩. ⟨hal-01654472⟩
158 View
1198 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More