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  Peroxometalates Immobilized on Magnetically Recoverable Catalysts for Epoxidation

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.

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 Creators:
Qiao, Yunxiang1, 2, Author           
Li, Huan1, Author
Hua, Li1, Author
Orzechowski, Lars2, Author           
Yan, Kai2, Author           
Feng, Bo1, Author
Pan, Zhenyan1, Author
Theyssen, Nils2, Author           
Leitner, Walter3, 4, Author           
Hou, Zhenshan1, Author
Affiliations:
1Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Kaiser-Wilhelm-Platz 1, 45470 MRoad, Shanghai 200237 (P. R. China), ou_persistent22              
2Service Department Theyssen (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, DE, ou_1445632              
3Institut für Technische und Makromolekulare Chemie, Lehrstuhl für Technische Chemie und Petrolchemie,RWTH Aachen, 52064 Aachen (Germany), ou_persistent22              
4Service Department Leitner (Technical Labs), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445626              

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Free keywords: covalent bonds; epoxidation; hydrogen bonds; magnetic materials; nanoparticles; peroxometalates
 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.

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 Dates: 2012
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/cplu.201200246
 Degree: -

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Title: ChemPlusChem
Source Genre: Journal
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Pages: - Volume / Issue: 77 (12) Sequence Number: - Start / End Page: 1128 - 1138 Identifier: ISSN: 2192-6506
CoNE: https://pure.mpg.de/cone/journals/resource/2192-6506