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Autori: J. Bódis, J. A. Lercher
Editorial: Studia-Chem., 49 (2), p.53-60, 2004.
The reductive amination of butanal with ammonia (at ammonia/butanal molar ratios of ~ 14.5) and hydrogen has been performed at 50 bar and 323-353 K over graphite and charcoal supported noble metal catalysts. Rhodium and platinum based catalysts showed the highest activity. The BET area and metal dispersion markedly influenced the activity without changing the selectivity. The products (butylamine, dibutylamine and tributylamine) were detected in the reaction mixture only after an apparent induction period. Butylamine and dibutylamine seem to be primary products, which are hardly interconverted. Good hydrogenolysis catalysts (Ru, Rh) produced mostly primary amines, while active hydrogenation catalysts (Pt, Pd) directed the reductive amination of butanal towards secondary and tertiary amines.
Cuvinte cheie: Reductive amination, Butanal, Amines, Noble metal catalysts, Carbon supports