Polymerization of polycarbosilanes in high internal phase emulsions for the synthesis of macroporous silicon carbide catalysts (polyHIPE-SiC)

A new method for the preparation of macroporous silicon carbide using a polyHIPE approach is presented (polyHIPE = polymerized High Internal Phase Emulsion). A liquid preceramic precursor is copolymerized with styrene and the crosslinker divinylbenzene in different ratios and two different initiator...

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Bibliographic Details
Published in:Journal of materials chemistry 2011-01, Vol.21 (32), p.11936-11940
Main Authors: Frind, Robert, Oschatz, Martin, Kaskel, Stefan
Format: Article
Language:English
Subjects:
Cerium oxide
Crosslinking
Emulsion polymerization
Polymerization
Porosity
Silicon carbide
Specific surface
Styrenes
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Summary:A new method for the preparation of macroporous silicon carbide using a polyHIPE approach is presented (polyHIPE = polymerized High Internal Phase Emulsion). A liquid preceramic precursor is copolymerized with styrene and the crosslinker divinylbenzene in different ratios and two different initiators. The resulting PCS-co-Sty-co-DVB-polyHIPEs are pyrolysed at 1300 [degree]C under argon atmosphere. Macroporous SiC-polyHIPEs are formed with specific surface areas up to 167 m2 g-1. Mercury porosimetry shows the presence of macropores with a pore radius between 200 and 2000 nm and total porosities between 36 and 94%. One SiC-polyHIPE is functionalized with cerium nitrate to form CeO2-SiC-polyHIPEs with varying ceria contents. These SiC-supported ceria show catalytic activity in the temperature programmed oxidation of methane, lowering the onset temperature by 366 K.
ISSN:0959-9428
1364-5501
DOI:10.1039/c1jm10612k