Figure 3.

Detailed schematic representation of the processes taking place during impregnation synthesis: (1) adsorption of charged dissolved species on alumina surface groups with opposite charge, in the case of multiple species with the same type of charge this adsorption is competitive (2). Anions shielding the dissolved metal from interacting (3). The dissolved metal adsorbing on previously deposited iron or copper species (4). Nondeposited metal remaining in solution in the alumina pores (5), until evaporation of the solvent.