Beyond the Selectivity-Capacity Trade-Off: Ultrathin Carbon Nanoplates with Easily Accessible Ultramicropores for High-Efficiency Propylene/Propane Separation.
basic_science · Level V
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- Record sourced from PubMed, PMID 35938361.
- Also identified by DOI 10.1021/acs.nanolett.2c01930.
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Abstract
Rapid and highly efficient C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation over porous carbons is seriously hindered by the trade-off effect between adsorption capacity and selectivity. Here, we report a new type of porous carbon nanoplate (CNP) featuring an ultrathin thickness of around 8 nm and easily accessible ultramicropores (approximately 5.0 Å). The ultrathin nature of the material allows a high accessibility of gas molecules into the interior transport channels, and ultramicropores magnify the difference in diffusion behavior between C<sub>3</sub>H<sub>6</sub> and C<sub>3</sub>H<sub>8</sub> molecules, together ensuring a remarkable C<sub>3</sub>H<sub>6</sub>/C<sub>3</sub>H<sub>8</sub> separation performance. The CNPs show a high and steady C<sub>3</sub>H<sub>6</sub> capacity of up to 3.03 mmol g<sup>-1</sup> at 298 K during consecutive dynamic cycles, which is superior to that of the state-of-the-art porous carbons and even porous crystalline materials. In particular, the CNPs show a rapid gas diffusivity, which is 1000 times higher than that of conventional activated carbons. This research provides a promising design principle for addressing the selectivity-capacity trade-off for other types of adsorbent materials.