Potassium addition to Fe/MgO, Ni/MgO and Ni/SiO2: Reducibility, dispersity and stabilization of the promoter by the support |
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| Authors: | P. Moral H. Praliaud G. -A. Martin |
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| Affiliation: | (1) Institut de Recherches sur la Catalyse, Laboratoire Propre du CNRS, Conventionné à l'Université Claude Bernard Lyon I, 2, avenue Albert Einstein, 69626 Villeurbanne, Cédex, France |
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| Abstract: | ![]()
The influence of potassium addition on the morphological properties of Fe/MgO and Ni/MgO has been investigated: KNO3 addition to precursors results in a decrease of the reducibility and in a smaller dispersity of the metallic phase. A loss of potassium is observed at reduction temperatures in excess of 773 K. Silica-supported Ni behaves differently: silica inhibits the potassium volatilization and nickel reducibility is enhanced. This illustrates how promoter effects can be influenced by the nature of support.
                    Fe/MgO Ni/MgO: KNO3        .   ,  773 K.  , : .   .
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