Nickel catalysts promoted with cerium and lanthanum to reduce carbon formation in partial oxidation of methane reactions

• Published in: Applied catalysis. A, General General, 2007-12, Vol.333 (1), p.90-95
• Main Authors: Lucrédio, Alessandra Fonseca, Jerkiewickz, Gregory, Assaf, Elisabete Moreira
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Cerium; Chemistry; Exact sciences and technology; General and physical chemistry; Hydrotalcite; Lanthanum; Nickel; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2007.09.009

Mixed oxides of nickel, magnesium and aluminum prepared by precursors hydrotalcite type were substituted by lanthanum or cerium and were characterized by XPS; EDS; BET; XRD; TPR. The catalysts were tested in the POM and the results showed that the catalysts promoted led to a reduction in the velocity of the carbon formation. ▪ Mixed oxides of nickel, magnesium and aluminum were prepared by precursors hydrotalcite type and were substituted by lanthanum or cerium using the method of anion exchange. The catalysts were characterized by X-Ray Photoelectronic Spectroscopy (XPS); Energy Dispersive X-Ray Spectroscopy (EDS); Surface Area Method BET; X-Ray Diffraction (XRD); Temperature Programmed Reduction (TPR) and Catalytic Tests. Analysis of the mixed oxides suggests that the hydrotalcite type precursor after thermal treatment lead a good dispersion of nickel forming the periclase (Ni, Mg)O replaced by cations of Al 3+ and spinel structure (Ni,Mg)Al 2O 4. The catalysts were tested in the partial oxidation of methane and the results showed that the catalysts promoted with lanthanum and cerium led to a reduction in the velocity of the carbon formation.