INVESTIGADORES
DE MIGUEL sergio Ruben
artículos
Título:
INFLUENCE OF THE REDUCTION TEMPERATURE ON THE CHARACTERISTICS OF THE METALLIC PHASE OF Pt-Ge/Al2O3 CATALYSTS.
Autor/es:
S.R. DE MIGUEL; J.A. MARTíNEZ CORREA; G.T. BARONETTI; A.A.CASTRO; O.A. SCELZA
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 1990 vol. 60 p. 47 - 59
ISSN:
0926-860X
Resumen:
The state of the metallic phase of Pt?Ge (0.3-0.3 wt.-%) /Al2O3 catalysts prepared by different deposition sequences of the metallic precursors (H2PtCl6 and GeCl4) was studied by temperature programmed reduction (TPR), hydrogen chemisorption and various test reactions. The characteristics of the metallic phase do not depend on the deposition sequence used for the catalyst preparation. At reduction temperatures lower than 350°C, germanium species placed near platinum atoms provide only a geometric effect, but at higher reduction temperatures, germanium, which is mainly in the zerovalent state, modifies the electronic properties of platinum with probably alloys formation. Studies on the acidic function of Pt/Al2O3, Ge/Al2O3 and Pt?Ge/Al2O3 catalysts indicate that the acidic strength distribution of ã-Al2O3 is not modified by the addition of platinum, germanium or platinum and germanium.
