Abstract
A new type of hierarchically porous carbon (HPC) structures of simultaneously high surface area and high pore volume has been synthesised from carefully controlled carbonization of in-house optimised metal–organic frameworks (MOFs). Changes in synthesis conditions lead to millimetre-sized MOF-5 crystals in a high yield. Subsequent carbonization of the MOFs yield HPCs with simultaneously high surface area, up to 2734 m2 g−1, and exceptionally high total pore volume, up to 5.53 cm3 g−1. In the HPCs, micropores are mostly retained and meso- and macro- pores are generated from defects in the individual crystals, which is made possible by structural inheritance from the MOF precursor. The resulting HPCs show a significant amount of CO2 adsorption, over 27 mmol g−1 (119 wt%) at 30 bar and 27 °C, which is one of the highest values reported in the literature for porous carbons. The findings are comparatively analysed with the literature. The results show great potential for the development of high capacity carbon-based sorbents for effective pre-combustion CO2 capture and other gas and energy storage applications.
Highlights
Exceptional CO2 capture in a hierarchically porous carbon with simultaneous high surface area and pore volume† Cite this: Energy Environ
hierarchically porous carbon (HPC) essentially consist of local defective carbon structures with mainly sp[2] bonding. We show that these new materials exhibit simultaneously high surface areas, up to 2734 m2 gÀ1, and hierarchical pores (micro, meso (>2 nm) and macro (>50 nm)) with very high total pore volumes, up to 5.53 cm[3] gÀ1, achieved by controlling synthesis conditions of the metal–organic frameworks (MOFs) precursors
The high pressure CO2 uptake of over 27 mmol gÀ1 at 30 bar and 27 C in HPCs is one of the largest reported in the literature for porous carbons
Summary
Exceptional CO2 capture in a hierarchically porous carbon with simultaneous high surface area and pore volume† Cite this: Energy Environ. A new type of hierarchically porous carbon (HPC) structures of simultaneously high surface area and high pore volume has been synthesised from carefully controlled carbonization of in-house optimised metal–organic frameworks (MOFs). Subsequent carbonization of the MOFs yield HPCs with simultaneously high surface area, up to 2734 m2 gÀ1, and exceptionally high total pore volume, up to 5.53 cm[3] gÀ1. The resulting HPCs show a significant amount of CO2 adsorption, over 27 mmol gÀ1 (119 wt%) at 30 bar and 27 C, which is one of the highest values reported in the literature for porous carbons. The results show great potential for the development of high capacity carbon-based sorbents for effective precombustion CO2 capture and other gas and energy storage applications
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