Carbon supported bimetallic catalysts containing iron
作者： A. Guerrero-Ruiz , A. Sepúlveda-Escribano , I. Rodríguez-Ramos
DOI: 10.1016/0926-860X(92)80262-B
关键词: Transition metal 、 Carbon monoxide 、 Bimetallic strip 、 Catalysis 、 Metal 、 Alloy 、 Hydrogen 、 Chemistry 、 Inorganic chemistry 、 Carbon
摘要: X-ray diffraction, hydrogen and carbon monoxide chemisorption, transmission electron microscopy combined with energy-dispersive analysis of (TEM-EDAX) Mossbauer effect spectroscopy (MS) were used to study the genesis final chemical states bimetallic Fe-M (MCo, Ni, Ru, Rh, Pd, Ir or Pt) clusters supported over an activated carbon. While iron reducibility was inhibited in Ni) bimetallics, noble metals facilitate reduction atoms. However, a residual fraction Fe3+ remains all samples, even when reduced at 723 K for 12 h. Formation alloy detected catalysts after treatment 673 K. The and/or nature second alloying metal, as well temperature affect sizes resulting metal aggregates. reactivity oxygen followed by MS, EDAX various catalyst regions (zone single particle analysis) seem indicate that small crystallites are constituted alloys while higher aggregates segregation phases containing only one metal.
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