Abstract
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.
Translated title of the contribution | Thermal reduction of Cu2+ in presence of Ag+ in clinoptilolite: Structural study by EXAFS and HR-XRD |
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Original language | English |
Pages (from-to) | 119-124 |
Number of pages | 6 |
Journal | Revista Cubana de Fisica |
Volume | 36 |
Issue number | 2 |
State | Published - 1 Dec 2019 |