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7855770 
Journal Article 
Reductive condensation of acetone to methyl isobutyl ketone on a bifunctional catalyst 
Bombos, D; Bozga, G; Bombos, M; Stefan, A; Stanciu, I 
2000 
Yes 
Chemical Papers / Chem Zvesti
ISSN: 0366-6352
EISSN: 1336-9075 
SLOVAK ACADEMIC PRESS LTD 
BRATISLAVA 
54 
3 
171-176 
English 
WOS:000088514500008 
The methyl isobutyl ketone (MIBK) was obtained in vapour phase, from acetone and hydrogen in a single step, using Pd/(Zn) H-ZSM-5 as a catalyst. The chemical transformation occurs in a sequence of two steps, acetone condensation to mesityl oxide on the acidic sites of zeolite, followed by the mesityl oxide hydrogenation to MIBK on the palladium metallic sites. The experiments were performed in a continuous fixed bed reactor at 0.5 MPa, 135-210°C, hydrogen/acetone mole ratios of 0.5-9, and acetone mass hourly space velocity of 0.15-1 h-1. The experimental data showed that the hydrogenation step occurs very fast compared with the condensation one, the intermediary mesityl oxide not being identified in the reaction mixture. The obtained acetone conversion was up to 55% and MIBK selectivity between 83% and 94%. A kinetic model was also proposed, assuming that the overall process rate is controlled by the acetone condensation step.