Hydrogenation properties of ruthenium sulfide clusters in acidic zeolites

Breysse, M; Cattenot, M; Kougionas, V; Lavalley, JC; Mauge, F; Portefaix, JL; Zotin, JL

dc.contributor.author	Breysse, M	en
dc.contributor.author	Cattenot, M	en
dc.contributor.author	Kougionas, V	en
dc.contributor.author	Lavalley, JC	en
dc.contributor.author	Mauge, F	en
dc.contributor.author	Portefaix, JL	en
dc.contributor.author	Zotin, JL	en
dc.date.accessioned	2014-03-01T01:45:56Z
dc.date.available	2014-03-01T01:45:56Z
dc.date.issued	1997	en
dc.identifier.issn	00219517	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24805
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0000591026&partnerID=40&md5=7b5001d3e619e52fcdff59adfca87e28	en
dc.title	Hydrogenation properties of ruthenium sulfide clusters in acidic zeolites	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	Catalysts of ruthenium sulfide, dispersed in a series of Y zeolites with various acidic properties, were prepared by ion exchange and subsequent sulfidation. The activities for the reactions of hydrogenation of tetralin and toluene, carried out in the presence of H2S (1.9%), vary widely according to the nature of the zeolites. Ruthenium sulfide catalysts are much more active when using acidic zeolite, HY and HYd (dealuminated), and a partially potassium-exchanged KHYd sample, than when using the KY support. The acidic properties of the sulfided RuY catalysts were determined in situ using infrared spectroscopy and the conversion of isooctane. Both methods gave similar rankings of catalyst acidity. The electronic properties of the ruthenium sulfide phase were examined by means of the infrared study of the adsorption of CO. A low-frequency shift of 15 cm-1 was observed for CO adsorbed on RuKY by reference to CO adsorbed on all other samples. The increase in activity for the hydrogenation of aromatics is related to the electron-deficient character of the sulfide particles in the acidic zeolites as has been proposed, in the literature, for metal catalysts. A superimposed influence of the acidic sites on the adsorption of the aromatic molecule may also occur which could explain the amplitude of the effect (difference of activity between the most and less active catalysts ∼200 times) and the variations of activity observed within the series of the acidic catalysts. © 1997 Academic Press.	en
heal.journalName	Journal of Catalysis	en
dc.identifier.volume	168	en
dc.identifier.issue	2	en
dc.identifier.spage	143	en
dc.identifier.epage	153	en