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  Synthesis of Structurally Stable Colloidal Composites as Magnetically Recyclable Acid Catalysts

Feyen, M., Weidenthaler, C., Schüth, F., & Lu, A.-H. (2010). Synthesis of Structurally Stable Colloidal Composites as Magnetically Recyclable Acid Catalysts. Chemistry of Materials, 22(9), 2955-2961. doi:10.1021/cm100277k.

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 Creators:
Feyen, Mathias1, Author              
Weidenthaler, Claudia1, Author              
Schüth, Ferdi1, Author              
Lu, An-Hui1, Author              
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1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              

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 Abstract: In this study, we provide a simple and reproducible method for the preparation of highly active and recyclable colloidal acid catalysts. First, 16-heptadecenoic acid-functionalized magnetite nanoparticles were encapsulated in monodisperse cross-linked polymer spheres. This was achieved by emulsion copolymerization technique in an aqueous phase of styrene and divinylbenzene (DVB). Different ratios of styrene and DVB were used to tune the structural stability and surface morphology of the composites. With increase in DVB content, the surfaces of the colloidal composites become increasingly rougher. The obtained colloids were functionalized with sulfonic acid groups to obtain magnetically recyclable catalysts with H+ contents in the range of 2.2−2.5 mmol g−1 and surface areas of 45−120 m2 g−1. For the condensation reaction of benzaldehyde and ethylene glycol, magnetic acid catalyst prepared only from DVB precursor was found to be active and with high selectivity and long-term stability.

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Language(s): eng - English
 Dates: 2010-01-272010-03-302010-05-11
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/cm100277k
 Degree: -

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Title: Chemistry of Materials
  Abbreviation : Chem. Mater.
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 22 (9) Sequence Number: - Start / End Page: 2955 - 2961 Identifier: ISSN: 0897-4756
CoNE: https://pure.mpg.de/cone/journals/resource/954925561571