The Preparation of LaAl_0.5Ni_0.5O₃ Perovskite and Its Catalytic Performance in Methane Dry Reforming

The hard template method was used to prepare the mesoporous LaAl_1-xAl_xO₃ perovskite catalyst with a large surface area, which was used for carbon-neutral methane dry reforming for reaction activity test at different temperatures. With scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffractometer (XRD), N₂ adsorption and desorption (BET), H₂ temperature programmed reduction (H₂-TPR), thermogravimetric analysis (TGA) and other methods, the as-prepared catalyst was characterized. The results showed that the LaAl_0.5Ni_0.5O₃ catalyst exhibited the most excellent activity and stability during the reaction, the initial activity of CH₄ and CO₂ in the LaAl_0.5Ni_0.5O₃ catalyst reached 69.8% and 81.5% respectively under the conditions of reaction temperature of 750 ℃ and space velocity GHSV=36 000 mL/(g·h). And the CH₄ and CO₂ activity of the LaAl_0.5Ni_0.5O₃ catalyst reduced by 2.7% and 3.3% respectively after the 25 h stability test. The reason was that the LaAl_0.5Ni_0.5O₃ catalyst obtained more Ni active sites than the LaAl_0.7Ni_0.3O₃ catalyst and the LaAl_0.5Ni_0.5O₃ catalyst had more favorable anti-sintering and anti-carbon deposition ability than the LaAl_0.3Ni_0.7O₃ catalyst.