Polymer-Derived Silicoboron Carbonitride Foams for CO2 Capture: From Design to Application as Scaffolds for the in Situ Growth of Metal-Organic Frameworks

详细信息    查看全文

• 作者：Dr. Fabien Sandra ; Dr. Martin Depardieu ; Dr. Zineb Mouline ; Prof. Gé ; rard L. Vignoles ; Prof. Yuji Iwamoto ; Prof. Philippe Miele ; Prof. Ré ; nal Backov and Dr. Samuel Bernard
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：June 6, 2016
• 年：2016
• 卷：22
• 期：24
• 页码：8346-8357
• 全文大小：7079K
• ISSN：1521-3765

文摘

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 %.