Discrimination between synthetic MgAl double hydroxides and related carbonate phases

Pure mixed MgAl double hydroxides were utilized for the preparation of the corresponding MgAl hydroxycarbonates. Three different modes of carbonation were adopted: CO 2 was bubbled through MgAl double hydroxides or these compounds underwent exchange with NaHCO 3 or Na 2CO 3 in aqueous solution. The resulting carbonated phases were investigated by X-ray, DTA, TG, and analysed chemically, and the results compared with those of mixed MgAl double hydroxides. © 1980