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Polymer‐Derived Silicoboron Carbonitride Foams for CO2 Capture: From Design to Application as Scaffolds for the in Situ Growth of Metal–Organic Frameworks |
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| Authors: | Dr. Fabien Sandra Dr. Martin Depardieu Dr. Zineb Mouline Prof. Gérard L. Vignoles Prof. Yuji Iwamoto Prof. Philippe Miele Prof. Rénal Backov Dr. Samuel Bernard |
| Affiliation: | 1. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Universite Montpellier, Montpellier, France;2. Centre de Recherche Paul Pascal, Université de Bordeaux, UPR 8641 CNRS, Pessac, France;3. Nagoya Institute of Technology, Graduated School of Engineering, Department of Frontier Materials, Nagoya, Aichi, Japan;4. University of Bordeaux, Laboratoire des Composites ThermoStructuraux (LCTS), UMR 5801: CNRS-Herakles(Safran)-CEA-UBx 3, Pessac, France |
| Abstract: | 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 m2 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 %. |
| Keywords: | foams hierarchical porosity metal– organic frameworks precursor chemistry siliconboron carbonitrides |