High activity of Mn-MgAl hydrotalcite in heterogeneously catalyzed liquid-phase selective oxidation of alkylaromatics to benzylic ketones with 1 atm of molecular oxygen

Mn-MgAl hydrotalcite, surface-enriched with Mn, was prepared by thermal decomposition of MgAl hydrotalcite followed by reconstruction of its structure in the presence of Mn(II) cations and atmospheric CO 2 as a guest inorganic anion through contacting the decomposed mass with aqueous Mn(II) nitrate...

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Bibliographic Details
Published in:Journal of catalysis 2007-04, Vol.247 (2), p.214-222
Main Authors: Jana, Suman K., Kubota, Yoshihiro, Tatsumi, Takashi
Format: Article
Language:English
Subjects:
Alkylaromatics
Benzylic ketones
Catalysis
Catalysts
Chemistry
Exact sciences and technology
General and physical chemistry
Manganese compounds
Mn-MgAl hydrotalcite
Molecular oxygen
Oxidation
Oxygen
Polycyclic aromatic hydrocarbons
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Mn-MgAl hydrotalcite, surface-enriched with Mn, was prepared by thermal decomposition of MgAl hydrotalcite followed by reconstruction of its structure in the presence of Mn(II) cations and atmospheric CO 2 as a guest inorganic anion through contacting the decomposed mass with aqueous Mn(II) nitrate solution. The Mn-MgAl hydrotalcite showed very high catalytic activity, stability, and reusability in the liquid-phase selective oxidation of a wide range of alkylaromatics to their corresponding benzylic ketones, using atmospheric pressure of molecular O 2 as a sole oxidant under solvent-free and mild reaction conditions. The catalytic performance of Mn-MgAl hydrotalcite was found to be much higher than that of Mn-containing hydrotalcites prepared by different methods or MgAl hydrotalcite catalysts containing various other transition metals and synthesized through similar procedures.
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2007.02.004