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Polymer‐Derived Silicoboron Carbonitride Foams for CO 2 Capture: From Design to Application as Scaffolds for the in Situ Growth of Metal–Organic Frameworks

2016; Wiley; Volume: 22; Issue: 24 Linguagem: Inglês

10.1002/chem.201600060

1521-3765

Fabien Sandra, Martin Depardieu, Zineb Mouline, Gérard L. Vignoles, Yuji Iwamoto, Philippe Miele, Rénal Backov, Samuel Bernard,

Membrane Separation and Gas Transport

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 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 CO 2 uptake of 2.2 %.