Carbon nanotube modified carbon composite monoliths as superior adsorbents for carbon dioxide capture

Carbon composite monoliths were prepared from a commercial phenolic resin mixed with just 1 wt% of carbon nanotubes (CNTs) followed by carbonization and physical activation with CO sub(2). The products possess a hierarchical macroporous-microporous structure and superior CO sub(2) adsorption properties. In particular, they show the top-ranked CO sub(2) capacity (52 mg CO sub(2) per g adsorbent at 25 degree C and 114 mmHg) under low CO sub(2) partial pressures, which is of more relevance for flue gas applications. This matches or exceeds those of carbons produced by complex chemical activation and functionalization. Our study demonstrates an effective way to create narrow micropores through structural modification of carbon composites by CNTs.