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

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.
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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, Elsevier, 2017, 320, pp.565 - 573. ⟨10.1016/j.powtec.2017.07.080⟩. ⟨hal-01654472⟩

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