Ultramicroporous silicon nitride ceramics for CO2 capture

Cristina Schitco, Mahdi Seifollahi Bazarjani, Ralf Riedel, Aleksander Gurlo
2015 Journal of Materials Research  
Carbon dioxide (CO 2 ) capture is regarded as one of the biggest challenges of the 21st century; therefore, intense research effort has been dedicated in the area of developing new materials for efficient CO 2 capture. Here, we report high CO 2 capture capacity in the low region of applied CO 2 pressures observed with ultramicroporous silicon nitride-based material. The latter is synthesized by a facile one-step NH 3 -assisted thermolysis of a polysilazane. Our newly developed material for CO 2
more » ... d material for CO 2 capture has the following outstanding properties: (i) one of the highest CO 2 capture capacities per surface area of micropores, with a CO 2 uptake of 2.35 mmol g À1 at 273 K and 1 bar (ii) a low isosteric heat of adsorption (27.6 kJ mol À1 ), which is independent from the fractional surface coverage of CO 2 . Furthermore, we demonstrate that the pore size plays a crucial role in elevating the CO 2 adsorption capacity, surpassing the effect of Brunauer-Emmett-Teller specific surface area.
doi:10.1557/jmr.2015.165 fatcat:rx2y4fanynes7ohhwkfu334jnq