B-cation partial substitution of double perovskite La<inf>2</inf>NiTiO<inf>6</inf> by Co^{2 +}: Effect on crystal structure, reduction behavior and catalytic activity

Abstract:

La2NiTi0.9Co0.1O6 and La2Ni0.9Co0.1TiO6 perovskites were obtained by partial substitution of either Ti4 + or Ni2 + from double perovskite La2NiTiO6 by Co2 +. The Rietveld analysis demonstrated that all as-synthesized samples have orthorhombic symmetry and space group Pbnm. Quantitative phase analysis using Rietveld refinement of XRD profiles after temperature programmed reduction showed that the reduction of La2NiTiO6 was modified by partial substitution of either Ni2 + or Ti4 + by Co2 +, being more evident for the La2NiTi0.9Co0.1O6. The activity of all catalysts for steam reforming of methane was attributed to both the reduction degree of two-valence metals and the metal-support interaction.

Año de publicación:

2017

Keywords:

• nickel
• Cobalt
• quantitative phase analysis
• Reduction
• double perovskite

Fuente:

google

scopus