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    STUDIA CHEMIA - Ediţia nr.1 din 2005  
         
  Articol:   MASS TRANSFER RATES DURING THREE PHASE CATALYTIC REDUCTIVE AMINATION OVER SUPPORTED NOBLE METALS.

Autori:  J. BÓDIS, L. BÓDIS, J.A. LERCHER. 		 
       
         
  Rezumat:  Reductive amination of butanal and methyl ethyl ketone (MEK) with ammonia (at ammonia/MEK 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 in reductive amination of butanal and MEK. The rhodium catalysts had high selectivity towards primary amines while the platinum catalysts towards secondary amines. Tertiary amines were detected only in the reaction products resulted from butanal. The BET area and metal dispersion were found to have a pronounced influence on activity and selectivity. By varying the speed of stirring it was found that the mass transfer of hydrogen from the gas phase into the liquid did not limit the rate of reactions. Model calculations showed that mass transfer limitations of hydrogen diffusion from the liquid to the solid did not also influence the measured reaction rates.  
         
     
         
         
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