Rh–Ni Bimetallic Catalysts for Enhanced Production of Cyclohexylamine via Reductive Amination
Palavras-chave:
Rhodium-Nickel , Amination , Bimetallic CatalystsResumo
The reductive amination of cyclohexanone with NH₃ and H₂ over Rh and Rh–Ni catalysts supported on SiO₂ was studied to produce cyclohexylamine, a key intermediate in fine chemicals. Catalysts with varying Ni loadings (1–10 wt.%) were prepared by wet impregnation and characterized by N₂ physisorption, TEM, XRD, XPS, H₂-TPR, and NH₃-TPD. Bimetallic Rh–Ni catalysts exhibited improved catalytic performance due to enhanced dispersion, reducibility, and acidity. The 2 wt.% NiRh/SiO₂ catalyst showed the best results, with 99.8% conversion, 96.4% yield, and 96.6% selectivity. Rh/SiO₂ reached 83.4% conversion and 99.1% selectivity. Reusability tests confirmed the stability of the bimetallic catalyst, which maintained 99.5% selectivity and 74.0% yield after four cycles.
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