Effect of Anions during a Solid-state Reaction Preparation of Ammonium Aluminum Carbonate Hydroxide

Ammonium aluminum carbonate hydroxide (AACH) can be obtained from different anions of aluminum sources by a solid-state reaction. Anions play a crucial role on the properties of AACH. It is observed that best-crystallized AACH can be obtained from Al 2 (SO 4 ) 3 . Depending on the nature of anion present during synthesis, AACH obtained either from Al 2 (SO 4 ) 3 or AlCl 3 has the similar phase transformations calcined at different temperatures, which is different from AACH obtained from Al(NO 3 ) 3 . The specific surface area (S BET ) of alumina prepared by Al 2 (SO 4 ) 3 , which is obtained from the calcination of AACH at 500C, is still in 610.6m2/g.