Effective Pore Distribution and Mechanism of CO2/CH4 Dynamic Separation by Carbon Molecular Sieves
Jianhong Gu, Ran Xu, Zhenlong Song, Zejun Xiao, Shengli Guo, Weile Geng, Xuefu Xian
TL;DR
This study identifies the optimal pore structure in carbon molecular sieves for efficiently separating CO2 and CH4 in biogas and landfill-gas upgrading.
Contribution
The work introduces a cooperative-separation mechanism combining thermodynamic and kinetic principles to optimize CMS pore architecture for gas separation.
Findings
CH4 uptake is controlled solely by ultramicropores (<10 Å), with no contribution from mesopores.
CO2/CH4 separation improves linearly with mesopore volume fraction in the 20–60 Å range.
High mesopore fractions slow CH4 adsorption but maintain fast CO2 uptake, enhancing separation efficiency.
Abstract
Addressing the pressing demand for biogas and landfill-gas upgrading within the global energy transition, this work strategically combines thermodynamic and kinetic separation principles to identify, from a cooperative-separation perspective, the effective pore-size range that governs carbon molecular sieve (CMS) performance. Thirty anthracite-derived CMS samples with distinct pore structures were synthesized and employed as a statistical set to link pore architecture with dynamic adsorption performance. The results clarify the effective pore-size range and mechanism for enhanced CMS selectivity: CH4 uptake depends exclusively on ultramicropores (<10 Å), with a negligible contribution from mesopores (>20 Å), whereas CO2 uptake is less sensitive to pore-size distribution. CO2/CH4 separation performance improves linearly with the volume fraction of mesopores >20 Å, defining a 20–60 Å…
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Taxonomy
TopicsCarbon Dioxide Capture Technologies · Membrane Separation and Gas Transport · Metal-Organic Frameworks: Synthesis and Applications