Effect of Preparation Method on the Activity of Fe2O3-NiO/γ-Al2O3 Catalyst in Decomposition of Methane

Abstract

The effect of method preparation on the activity of Fe₂O₃-NiO/γ-Al₂O₃ catalyst was investigated in process decomposition of methane. Fe₂O₃-NiO/γ-Al₂O₃ catalyst was prepared by impregnation and solution combustion methods. The samples were characterized by X-ray phase analysis (XRD), temperature-programmed hydrogen reduction (TPR-H₂), BET and Raman spectroscopy. It has been shown that the method of preparation plays an important role in regulating the textural and morphological properties of catalysts and provides a difference in their catalytic activity. The synthesis of the Fe₂O₃-NiO/γ-Al₂O₃ catalyst by the solution combustion method, in comparison with the capillary impregnation method, leads to the formation of a large amount of FeNi and FeAl₂O₄ solid solutions, which ensured good catalytic activity at high temperatures. The Fe₂O₃-NiO/γ-Al₂O₃ catalyst synthesized by the solution combustion method demonstrated good activity with a hydrogen yield of 52% within 150 min of the reaction without any deactivation. According to the results of Raman spectroscopy, graphene-like carbon was obtained on the surface of the catalysts. On the catalyst of Fe₂O₃-NiO/γ-Al₂O₃ (СI) synthesized by capillary impregnation, 4‒5 layer graphene on Fe₂O₃-NiO/γ-Al₂O₃ (SC)-6-7 layer graphene is formed.