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Covalent Immobilization of Polyoxotungstate on Alumina and Its Catalytic Generation of Sulfoxides
Author(s) -
Hong Lanlan,
Win Pyaesone,
Zhang Xuan,
Chen Wei,
Miras Haralampos N.,
Song YuFei
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201601864
Subject(s) - catalysis , polyoxometalate , covalent bond , chemistry , reactivity (psychology) , selectivity , dispersion (optics) , chemical engineering , organic chemistry , inorganic chemistry , medicine , physics , alternative medicine , pathology , engineering , optics
The structural and chemical stabilities of immobilized polyoxometalate (POM)‐containing catalysts are crucial factors for their industrial application. An alumina supported POM catalyst is prepared by using a facile condensation reaction between the trilacunary POM Na 12 [α‐P 2 W 15 O 56 ] ⋅ 24 H 2 O (P 2 W 15 ) and the hydroxy groups on the surface of γ‐Al 2 O 3 spheres under acidic conditions. The heterogeneous catalyst P 2 W 15 −Al 2 O 3 is characterized by a wide variety of techniques and shows excellent stability and highly efficient reactivity and selectivity for the oxygenation of thioethers to sulfoxides, which are a very useful intermediate in organic synthesis and the industrial preparation of drugs. Furthermore, P 2 W 15 −Al 2 O 3 can be recycled and reused at least ten times without any observable loss of its catalytic efficiency, mainly due to the covalent immobilization and high dispersion of P 2 W 15 on the γ‐Al 2 O 3 surface.