Interplay of anions and ligands on the nature and reducibility of NiOx/Al2O3 catalysts prepared by impregnation.
When NiOx/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.
Laboratoire de Réactivité de Surface (UMR CNRS 7609), Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris, France. negrier@ccr.jussieu.fr
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