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In this study, LaNiO 3 perovskite catalysts were prepared by citrate method and used for carbon dioxide (CO 2 ) methanation. The catalysts were activated at different temperatures (400–700°C) under the reactant stream. The activation led to the formation of small metallic nickel particles and hexagonal lanthanum oxocarbonate (La 2 O 2 CO 3) . Ni 0 was...