Temperature-programmed reduction. Metal-support interaction on supported monometallic Ru and Cu Catalysts |
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Authors: | S Galvagno C Crisafulli R Maggiore G R Tauszik A Giannetto |
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Institution: | (1) Istituto Cnr-Tae, Via S. Lucia, 39, Pistunina-Messina, Italy;(2) Dipartimento di Scienze Chimiche - Laboratorio di Petrolchimica, Università di Catania, V.Le A. Doria 6, Catania, Italy;(3) Montedipe, Centro Ricerche Bollate, Via S. Pietro, 50, Bollate-Milano, Italy |
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Abstract: | Ru and Cu samples supported on SiO2, Al2O3 and MgO were studied by the temperature-programmed reduction (TPR) technique. Experiments were carried out both on unreduced impregnated salts and after oxidation of already reduced samples.The TPR profiles were found to be strongly dependent on the support used, indicating different degrees of interaction between the metal and the support, which can be ranked as MgO Al2O3>SiO2. It is suggested that the interaction occurs through the formation of surface complexes difficult to reduce. The decrease in hydrogen consumption observed on the Ru samples with the number of TPR cycles is attributed to the difficulty in oxidizing large Ru particles.
Zusammenfassung Auf SiO2, Al2O3 und MgO aufgebrachte Ru- und Cu-Proben wurden mittels temperaturprogrammierter Reduktion (TPR) untersucht. Experimente wurden sowohl an unreduzierten Salzimprägnierungen als auch nach Oxydation von bereits reduzierten Proben ausgeführt. Die TPR-Profile sind stark vom benutzten Trägen abhängig, was auf unterschiedliche Grade der Wechselwirkung zwischen Metall und Träger hindeutet; die Reihenfolge ist MgO Al2O3>SiO2. Es wird vermutet, daß das Wesen der Wechselwirkung in der Bildung von schwer reduzierbaren Oberflächenkomplexen zu suchen ist. Die bei Ru-Proben mit der Zahl der TPR-Zyklen beobachtete Verminderung des Wasserstoffverbrauchs wird mit der Schwierigkeit, große Ru-Partikel zu oxydieren, in Zusammenhang gebracht.
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