title: Covalent Immobilization of Polyoxotungstate on Alumina and Its Catalytic Generation of Sulfoxides.
abstract: 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 Na12 [α-P2 W15 O56 ]⋅24 H2 O (P2 W15 ) and the hydroxy groups on the surface of γ-Al2 O3 spheres under acidic conditions. The heterogeneous catalyst P2 W15 -Al2 O3 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, P2 W15 -Al2 O3 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 P2 W15 on the γ-Al2 O3 surface.
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Lanlan
authors.initials: L
authors.lastname: Hong
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Pyaesone
authors.initials: P
authors.lastname: Win
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China. chenw@mail.buct.edu.cn.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: WestCHEM, School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
authors.forename: Haralampos N
authors.initials: HN
authors.lastname: Miras
authors.affiliation: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China. songyufei@hotmail.com, songyf@mail.buct.edu.cn.
authors.forename: Yu-Fei
authors.identifier: http://orcid.org/0000-0003-1309-0626
authors.initials: YF
authors.lastname: Song
keywords: alumina; immobilization; oxidation; polyoxometalates; supported catalysts