Characterization of Calcined and Reduced Multi-Component Co−Ni−Mg−Al-Layered Double Hydroxides

✍ Scribed by Didier Tichit; Solange Ribet; Bernard Coq

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 335 KB
• Volume: 2001
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/1099-0682(200102)2001:2<539::aid-ejic539>3.0.co;2-r

✦ Synopsis

Several Co-Ni-Mg-Al-layered double hydroxides (LDH) have been synthesized by coprecipitation at constant pH = 9. All samples present well crystallized, layered structures, no excess phases were detected by X-ray diffraction, and the lattice a parameter followed the Vegard correlation. The cations thus belong to the same, brucite-like, lattice. Calcined samples exhibit XRD patterns of the crystallographic phase preferentially adopted by the major cation in the LDH: i.e., a mixed oxide of the rock salt type in the case of Ni or Mg, and a spinel-like structure for Co. Surface areas reached max- [a]