Title: Catalytic oxidations by in situ generated peroxotungsten complexes immobilized on layered double hydroxides (LDH): Relation between catalytic properties and peroxotungstate micro-environment
Authors: Sels, Bert ×
De Vos, Dirk
Jacobs, Pierre #
Issue Date: 1997
Publisher: Elsevier
Series Title: Studies in Surface Science and Catalysis vol:110 pages:1051-1059
Conference: date:Katholieke Univ Leuven, Ctr Surface Chem & Catalysis, B-3001 Heverlee, Belgium
Abstract: Tungstate is exchanged on a Cl--LDH and converted into peroxo complexes by the action of H2O2. This hydrophilic material is an efficient catalyst for the truly heterogeneous epoxidation of allylic alcohols. The alkaline nature of the LDH suppresses hydrolysis of the epoxides. For simple olefins such as cyclohexene, the use of a Lipophilic LDH, exchanged with WO42- and an organic anion, is more appropriate. In these reactions, the apolar surface provides a suitable micro-environment for epoxide formation with over 90 % selectivity. Finally it is demonstrated that a co-anion such as SO42- favorably influences the selective oxidation by peroxoW, probably through formation of heteronuclear S-W peroxoclusters.
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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