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Preparation and catalytic activity for ammonia synthesis of several ruthenium supported catalysts
Author(s) -
De La Piscina P. Ramírez,
Homs N.,
Sueiras J. E.
Publication year - 1985
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19855220328
Subject(s) - ruthenium , catalysis , chemistry , acetone , solvent , ammonia , adsorption , nuclear chemistry , metal , base (topology) , inorganic chemistry , organic chemistry , mathematical analysis , mathematics
Abstract Ruthenium supported catalysts were prepared from RuCl 3 · 3H 2 O and K 4 [Ru(CN) 6 ] · 3 H 2 O solutions, upon several acid/base pretreated γ‐Al 2 O 3 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 K 4 [Ru(CN) 6 ] · 3 H 2 is used as a precursor. The catalytic activity was followed at atmospheric pressure and 593 K (N 2 /H 2 = 1/3). Catalysts prepared from K 4 [Ru(CN) 6 ] · 3 H 2 O were about ten fold more active than those prepared from RuCl 3 · 3 H 2 O. The catalytic activity of catalysts prepared from K 4 [Ru(CN) 6 ] · 3 H 2 O was found to be sensitive to the acid‐pretreatment of γ‐Al 2 O 3 , while the activity of those prepared from RuCl 3 · 3 H 2 O was not sensitive to the pretreatment of the support.