Catalysis Letters, Vol.146, No.1, 47-53, 2016
Steam Reforming of Methane Over Catalyst Derived from Ordered Double Perovskite: Effect of Crystalline Phase Transformation
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 degrees C, under different reduction conditions. By reducing La2NiTiO6 with 10 % H-2/N-2 at 1,000 degrees C, the crystalline phase changed to mainly Ni-0 and La2TiO5, which decreases the onset temperature of methane conversion to 550 degrees C and provides a maximum methane conversion of 95 % at 950 degrees C. This activity is higher when compared to that achieved with La2NiTiO6 reduced with 1.8 % H-2/Ar, which is composed of Ni-0 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. [GRAPHICS] .