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  The Application of Ru-exchanged Zeolite NaY in Ammonia Synthesis

Wellenbüscher, J., Rosowski, F., Klengler, U., Muhler, M., Ertl, G., Guntow, U., et al. (1994). The Application of Ru-exchanged Zeolite NaY in Ammonia Synthesis. In J. Weitkamp, H. Karge, H. Pfeifer, & W. Hölderich (Eds.), Zeolites and Related Microporous Materials: State of the Art 1994 - Proceedings of the 10th International Zeolite Conference, Garmisch-Partenkirchen, Germany, 17-22 July 1994 (pp. 941-948). Amsterdam: Elsevier.

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 Urheber:
Wellenbüscher, Jörg1, Autor           
Rosowski, Frank2, Autor           
Klengler, U.1, Autor           
Muhler, Martin2, Autor           
Ertl, Gerhard2, Autor           
Guntow, U.3, Autor
Schlögl, Robert3, Autor           
Affiliations:
1Fritz Haber Institute, Max Planck Society, ou_24021              
2Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
3J.W. Goethe Universität, Frankfurt, ou_persistent22              

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 Zusammenfassung: A series of NaY zeolite catalysts with varied Ru loadings was prepared by ion-exchange using Ru(NH3)6Cl3in aqueous solution. During the ion-exchange oxidative hydrolysis was found to occur resulting in oligomeric compounds like Ru red within the zeolite framework. The purple-coloured precursors were transformed into the active state by slowly heating in a N2/H2= 1/3 synthesis gas mixture. The Ru/NaY samples proved to be high-temperature and long-term stable NH3catalysts both at atmospheric pressure and at 20bar. The stability under the reducing reaction conditions is rationalized by the ship-in-the-bottle model, i.e., the zeolite framework prevents the Ru clusters from sintering. When heating in O2at 723K, Ru was found to segregate to the outer surface forming large RuO2particles which could easily be rereduced. The various states of the Ru/NaY samples were characterized by a combination of surface-sensitive and bulksensitive methods.

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Sprache(n): eng - English
 Datum: 1994
 Publikationsstatus: Erschienen
 Seiten: 8
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1016/S0167-2991(08)63627-7
 Art des Abschluß: -

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Titel: Zeolites and Related Microporous Materials: State of the Art 1994 - Proceedings of the 10th International Zeolite Conference, Garmisch-Partenkirchen, Germany, 17-22 July 1994
Genre der Quelle: Buch
 Urheber:
Weitkamp, J., Herausgeber
Karge, H.G., Herausgeber
Pfeifer, H., Herausgeber
Hölderich, W., Herausgeber
Affiliations:
-
Ort, Verlag, Ausgabe: Amsterdam : Elsevier
Seiten: 8 Band / Heft: - Artikelnummer: - Start- / Endseite: 941 - 948 Identifikator: ISBN: 978-0-444-81847-8

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Titel: Studies in Surface Science and Catalysis
Genre der Quelle: Reihe
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 84 Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 0167-2991