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Studies of the homogeneity, degree of Ni dispersion in the fresh catalyst and the morphological appearance of the fresh and used catalysts have been carried out with a scanning electron microscope (SEM) Hitachi S-3400 coupled to a Si/Li detector for energy dispersive X-ray (EDX) analysis.
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Additionally, line profiles of Ni Ka and Cu Ka in Ni-Cu-Si catalysts (Fig. 5b) reveal that Cu in the sample Fus Ni-Cu-Si is chemically associated with Ni in the reduced catalyst through the formation of a Ni Cu alloy that could not be resolved by XRD. For the impregnated catalysts the correlation of Ni Ka and Cu Ka line profiles is not complete. This effect is even more defined in the sample Imp2 Ni-Cu-Si in which some peaks£¬in the Cu profile correspond with valleys in the Ni profile,indicating that, at least, not all the copper is chemically associated to Ni.
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