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Kinetics of the liquid phase selective hydrogenation of 2,3‐butanedione over new composite supported Pd catalysts
Author(s) -
Carrara Nicolás,
Badano Juan,
Bertero Nicolás,
Torres Gerardo,
Betti Carolina,
MartínezBovier Luciana,
Quiroga Mónica,
Vera Carlos
Publication year - 2014
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4113
Subject(s) - catalysis , chemistry , selectivity , composite number , butanone , kinetics , heterogeneous catalysis , chemical engineering , inorganic chemistry , organic chemistry , materials science , composite material , physics , quantum mechanics , solvent , engineering
BACKGROUND Heterogeneous hydrogenation catalysts for fine chemical synthesis are a convenient alternative to homogeneous catalysts because of the ease of separation and reuse. In order to be good catalysts they must have high activity and selectivity and good mechanical properties. Appropriate kinetic models should also be available for reactor design. Novel composite supported Pd catalysts were synthesized and tested in the liquid‐phase selective hydrogenation of 2,3‐butanedione to 3‐hydroxy‐2‐butanone (acetoin). The composite support comprised a mixture of an organic polymer and γ‐ Al 2 O 3 . The support and the Pd catalyst were further characterized by XRD , SEM , EMPA and XPS spectroscopy. Catalytic tests at various conditions were performed in order to elucidate the kinetics of the system.RESULTS The composite had better mechanical properties (resistance to radial and axial compression) in comparison with other commercial supports. Good activity and high selectivity to acetoin, a product of partial hydrogenation, were obtained at different reaction conditions. A Langmuir–Hinshelwood chemical rate expression useful for reactor design was regressed from the kinetic data.CONCLUSIONS The experimental results could be explained by a Horiuti–Polanyi mechanism in which the addition of an H atom to the carbonyl group in the adsorbed state is the rate limiting step. © 2013 Society of Chemical Industry