Interplay of anions and ligands on the nature and reducibility of NiOx/Al2O3catalysts prepared by impregnation

Abstract

When NiO_x/Al₂O₃ catalysts (Ni wt% = 1.5) are prepared by impregnation using [NiL₂(H₂O)₂]X₂ as precursors (L = diamine, X = Cl⁻ or NO₃⁻), a supported oxidic or metallic phase can be selectively obtained after thermal treatment in N₂ depending on the nature of the ligand and counter anion ; the oxidic phase can be reduced at a lower temperature than the classical nickel aluminate phase obtained from [Ni(H₂O)₆](NO₃)₂.