Preparation and catalytic activity for ammonia synthesis of several ruthenium supported catalysts |
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| Authors: | P. Ramí rez De La Piscina,N. Homs,J. E. Sueiras |
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| Abstract: | Ruthenium supported catalysts were prepared from RuCl3 · 3H2O and K4[Ru(CN)6] · 3 H2O solutions, upon several acid/base pretreated γ-Al2O3 samples, using water and acetone as solvents. Metallic adsorption was found to be dependent on solvent and precursor used. An increasing final ruthenium content of the catalysts with increasing acid site content of the support is observed, when K4[Ru(CN)6] · 3 H2 is used as a precursor. The catalytic activity was followed at atmospheric pressure and 593 K (N2/H2 = 1/3). Catalysts prepared from K4[Ru(CN)6] · 3 H2O were about ten fold more active than those prepared from RuCl3 · 3 H2O. The catalytic activity of catalysts prepared from K4[Ru(CN)6] · 3 H2O was found to be sensitive to the acid-pretreatment of γ-Al2O3, while the activity of those prepared from RuCl3 · 3 H2O was not sensitive to the pretreatment of the support. |
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