Preparation and characterization of nickel-based mixed-oxides and their performance for catalytic methane decomposition

✍ Scribed by M.E. Rivas; J.L.G. Fierro; R. Guil-López; M.A. Peña; V. La Parola; M.R. Goldwasser

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 468 KB
• Volume: 133-135
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/j.cattod.2007.12.045

✦ Synopsis

The preparation of three different types of mixed nickel oxides is described. These systems include: (i) the perovskite LaNiO 3 oxide, (ii) a mixed-oxide derived from a hydrotalcite precursor, and (iii) the spinel-type NiAl 2 O 4 oxide. These systems were prepared with the aim of studying the activation procedure that develops small nickel nanoparticles deposited on a La 2 O 3 or Al 2 O 3 substrate active in H 2 production through catalytic decomposition of CH 4 . Different preparation procedures have been applied to each precursors (i)-(iii). Perovskite-type oxide LaNiO 3 was prepared by the sol-gel methodology (citrates method). Mixed oxide derived from hydrotalcite was obtained by co-precipitation using urea as a basic agent. NiAl 2 O 4 spinel synthesis was performed by the ceramic method. The three oxide-type materials were characterized by XRD, BET specific area, TPR and XPS. Characterization results showed that the preparation methods used allow formation of highly crystalline and homogeneous oxide precursors. After activation, the oxide precursors showed a high activity in the decomposition reaction of CH 4 . The catalysts derived from hydrotalcite mixed oxide showed the highest activity with CH 4 conversions reaching 50% at 500 8C.