Synthesis and characterization of metal mixed oxides from Layered Double Hydroxides

This work reports the synthesis and characterization of metal mixed oxides (MMOxs) obtained from precursors like Layered Double Hydroxides (LDHs). These materials were synthesized with two hydroxides of Mg-Al with the incorporation of mono, di and trivalent metal ions, such as Li, K, Ca, Ba, Ce, and La. The third metal incorporation took place through two different ways: the direct incorporation by the co-precipitation method and the incorporation through the impregnation of the mixed oxides by the wet impregnation method. All materials were characterized by XRD, SEM-EDX and specific surface area. The samples synthesized by both methods show the characteristic structure from the LDHs compounds derived and the third metal incorporated. However MMOxs obtained by co-precipitation method showed higher specific surface area and smaller particle size. (C) 2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of SAM/CONAMET 2011, Rosario, Argentina.