Performance and structural features of LaNi0.5Co0.5O3 perovskite oxides for the dry reforming of methane: influence of the preparation method

Abstract

LaNiO₃ and LaNi_0.5Co_0.5O₃ as Ni-based perovskite-type oxides were synthesized via the co-precipitation method and the activity of the catalysts was evaluated in the methane dry reforming reaction with CO₂. The structure of the prepared perovskites was changed by using magnetized water and was characterized by means of XRD, BET, SEM, TEM, TPR, and TPH techniques. The result demonstrated that the catalytic activity and the stability of LaNi_0.5Co_0.5O₃ were less than those of LaNiO₃ while the coke resistance was higher for the LaNi_0.5Co_0.5O₃ catalyst. On the other hand, it was proved that the presence of free Ni phase in the non-treated samples provided the higher initial activity in comparison to the magnetized ones. The trend for the amount of the deposited carbon over the surface of the spent catalysts was as follows: LaNiO₃ (none) > LaNiO₃ (treat) > LaNiCoO₃ (none) > LaNiCoO₃ (treat).