Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 24, Pages 8346-8357Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201600060
Keywords
foams; hierarchical porosity; metal-organic frameworks; precursor chemistry; siliconboron carbonitrides
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Funding
- Ademe (Agence De l'Environnement et de la Maitrise de l'Energie)
- PSA Peugeot-Citroen
- CEFIPRA agency [5108-1]
- ANR through the project PolyCeramem [ANR-13-BS08-009]
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A template-assisted polymer-derived ceramic route is investigated for preparing a series of silicoboron carbonitride (Si/B/C/N) foams with a hierarchical pore size distribution and tailorable interconnected porosity. A boron-modified polycarbosilazane was selected to impregnate monolithic silica and carbonaceous templates and form after pyrolysis and template removal Si/B/C/N foams. By changing the hard template nature and controlling the quantity of polymer to be impregnated, controlled micropore/macropore distributions with mesoscopic cell windows are generated. Specific surface areas from 29 to 239 m(2) g (1) and porosities from 51 to 77% are achieved. These foams combine a low density with a thermal insulation and a relatively good thermostructural stability. Their particular structure allowed the in situ growth of metal-organic frameworks (MOFs) directly within the open-cell structure. MOFs offered a microporosity feature to the resulting Si/B/C/N@MOF composite foams that allowed increasing the specific surface area to provide CO2 uptake of 2.2%.
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