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Steam Reforming of Methane over Catalyst Derived from Ordered Double Perovskite: Effect of Crystalline Phase Transformation

Abstract:

La2NiTiO6 double perovskite was synthesized by modified Pechini method. The catalyst activity for steam reforming of methane was investigated at temperatures from 450 to 950 °C, under different reduction conditions. By reducing La2NiTiO6 with 10 % H2/N2 at 1,000 °C, the crystalline phase changed to mainly Ni0 and La2TiO5, which decreases the onset temperature of methane conversion to 550 °C and provides a maximum methane conversion of 95 % at 950 °C. This activity is higher when compared to that achieved with La2NiTiO6 reduced with 1.8 % H2/Ar, which is composed of Ni0 supported on both non-stoichiometric La2NiTiO6 and La2O3, and also to those of unreduced La2NiTiO6 and Ni/La2O3 formed by reduction of LaNiO3. Activity improvement is related to the increased number of active sites and/or metal-support interaction.