The Nature of Ruthenium Sulfide Clusters Encaged in a Y Zeolite

• Published in: Journal of catalysis Vol. 165; no. 1; pp. 45 - 56
• Main Authors: Moraweck, Bernard, Bergeret, Gérard, Cattenot, Martine, Kougionas, Vassilios, Geantet, Christophe, Portefaix, Jean-Louis, Luiz Zotin, José, Breysse, Michèle
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.01.1997; Elsevier
• Subjects: Catalysis; Catalysts: preparations and properties; Chemical Sciences; Chemistry; Exact sciences and technology; General and physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Platinoid Compounds; Ruthenium; Transition metal Compounds; Zeolite; Experimental study; Supported catalyst; Molecular sieve; Characterization; Heterogeneous catalysis; Ruthenium Sulfides; Ion exchange; Catalyst activity; Catalyst; Modified material
• ISSN: 0021-9517; 1090-2694
• DOI: 10.1006/jcat.1997.1463

Catalysts of ruthenium sulfide supported in a dealuminated KY zeolite were prepared by ion exchange and subsequent sulfidation using several atmospheres containing sulfur. They were characterized by means of HREM, EDX, TPR, and EXAFS. The activity for the tetralin hydrogenation, carried out in presence of large amounts of H2S (1.85%), was very high and roughly 300 times the activity (expressed per metal atom) of an industrial NiMo/Al2O3hydrotreating catalyst. A simple modeling of the results obtained by the physicochemical techniques suggests that the active phase consists of clusters of less than 50 ruthenium atoms of a ruthenium sulfide-like phase with very small domains of ruthenium metal.