Resumen
Cu2+−Ag+ bimetallic systems were exchanged and then thermally reduced in natural clinoptilolite (CLI) from Tasajeras deposit (Cuba). The systems were characterized by means of extended X-ray absorption fine structure (EXAFS) and high resolution X-ray diffraction (HR-XRD) experiments. The EXAFS signals of the bimetallic systems showed changes in the Cu2+ coordination as a result of their reduction at 150◦C, which doesn't happen to CuCLI monometallic one. The presence of silver facilitates the reduction of Cu2+ in bimetallic systems forming only clusters. At higher reduction temperature (450◦C) all mono- and bi-metallic samples exhibit mainly metallic particles of Cu and Ag with higher aggregation. These results are confirmed by HR-XRD studies. Aggregation of reduced copper species is restricted in the presence of silver.
Título traducido de la contribución | Reducción térmica de Cu2+ en presencia de Ag+ en clinoptilolita: Estudio estructural por exafs y hr-xrd |
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Idioma original | Inglés |
Páginas (desde-hasta) | 119-124 |
Número de páginas | 6 |
Publicación | Revista Cubana de Fisica |
Volumen | 36 |
N.º | 2 |
Estado | Publicada - 1 dic. 2019 |