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Title: Epoxidation with manganese N,N '-bis(2-pyridinecarboxamide) complexes encapsulated in zeolite Y
Authors: Knops-Gerrits, PP ×
L'abbe, M
Jacobs, Pierre #
Issue Date: 1997
Publisher: ELSEVIER SCIENCE PUBL B V
Series Title: Studies in surface science and catalysis vol:108 pages:445-452
Conference: date:Katholieke Univ Leuven, Ctr Oppervlaktechem & Katalyse, B-3001 Heverlee, Belgium
Abstract: Adsorption of tetradentate ligands of the type N,N'-bis (2-pyridinecarboxamide)-1,2-R (bpR with R = ethane, cyclohexane, benzene) and -1,3-R (bpR with R = propane) on (MnNaY)-Na-II zeolites yields [Mn(bpR)]-NaY catalysts for the selective epoxidation of olefins with hydrogen peroxide (H2O2) and tertbutyl hydroperoxide (tBHP). The (de)protonation and coordination geometry of the occluded complexes is probed by FT-IR, EPR and DRS spectroscopy. Their catalytic activity in cyclohexene epoxidation differs strongly with the nature of the bridging ligand. Heterogenisation by zeolitic occlusion leads to a decrease in allylic oxidation of olefins with H2O2 and tBHP. Implications of ligand amide N-H protonation on hydrogen bonding with peroxides, catalyst activity and stability towards oxidation are shown. Solvent peroxide interactions and effects of residual zeolitic Bronsted acidity on epoxide selectivity are considerable.
Description: HETEROGENEOUS CATALYSIS AND FINE CHEMICALS IV
ISSN: 0167-2991
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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