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Journal Article

Peroxometalates Immobilized on Magnetically Recoverable Catalysts for Epoxidation

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons58905

Qiao,  Yunxiang
Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology;
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58857

Orzechowski,  Lars
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons59134

Yan,  Kai
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons59042

Theyssen,  Nils
Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons58749

Leitner,  Walter
Institut für Technische und Makromolekulare Chemie, Lehrstuhl für Technische Chemie und Petrolchemie,RWTH Aachen;
Service Department Leitner (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Qiao, Y., Li, H., Hua, L., Orzechowski, L., Yan, K., Feng, B., et al. (2012). Peroxometalates Immobilized on Magnetically Recoverable Catalysts for Epoxidation. ChemPlusChem, 77(12), 1128-1138. doi:10.1002/cplu.201200246.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-ED1B-E
Abstract
Magnetically separable catalysts were prepared and employed for the epoxidation of olefins with hydrogen peroxide. In all cases the magnetic core was firstly covered with a silica layer to prevent iron ion-initiated decomposition of hydrogen peroxide. The catalytic active species, an ionic liquid-type peroxotungstate, was then immobilized either by hydrogen bonding (catalyst 1) or by covalent SiO linkage (catalyst 2). In addition to a thorough characterization by FT-IR, XRD, NMR, DRIFT, XPS, and TEM, the catalytic potential was evaluated in the epoxidation of a variety of olefins as well as allylic alcohols. Both catalysts showed essentially a constant activity after at least ten consecutive cycles. On the basis of the research above, a new type of magnetically separable catalyst was constructed by immobilization of lacunary-type phosphotungstate by hydrogen bonding between the sulfonate anion and silanol group on the surface of the core–shell magnetic nanoparticles. After the detailed characterization, the catalyst was used in the epoxidation of a variety of olefins and allylic alcohols and was found to possess high activity, selectivity towards epoxides, and a constant activity after at least ten catalytic recycles without solvent.