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Single-atomic iron-nitrogen 2D MOF-originated hierarchically porous carbon catalysts for enhanced ox
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Understanding polymer-porous solid interactions based on small gas molecule adsorption behavior
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Adsorption-based direct air capture using hierarchical porous composites prepared via confined-space crystallization
Capturing CO₂ at trace concentration remains a critical challenge in sustainable carbon management via adsorption, as conventional adsorbents suffer from low CO₂ selectivity, poor moisture tolerance, and energy-intensive regeneration requirements. Here, we report a hierarchical Ba²⁺-exchanged silicoaluminophosphate (Ba²⁺-CSAPO-34) composite synthesized via confined-space crystallization within an activated carbon matrix. Comprehensive characterization revealed a confined nucleation mechanism and the successful incorporation of Ba²⁺ active sites within the SAPO-34 framework, achieved via a two-step liquid ion-exchange protocol. The core-shell architecture combines the selective CO₂ binding of Ba²⁺-functionalized SAPO-34 with the hydrophobic protection of the carbon shell. Fixed-bed adsorption tests demonstrated strong CO₂ binding (at 500-2500 ppm), no roll-up, and effective suppression of water affinity, while maintaining high selectivity even at 90% relative humidity. A phenomenological adsorption model, validated against dynamic breakthrough data, accurately predicted dynamic adsorption behavior under real-world operating conditions, enabling rational process design for direct air capture (DAC) and closed-loop life support systems. Furthermore, these results establish Ba²⁺-CSAPO-34 as a scalable, moisture-resistant adsorbent that addresses key limitations in trace CO₂ capture, advancing practical implementation of carbon removal technologies.
Multigrid reduction preconditioning framework for coupled processes in porous and fractured media
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A heteroencoder architecture for prediction of failure locations in porous metals using variational inference
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Continuum to rarefied diffusive tortuosity factors in porous media from X-ray microtomography
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Failure classification of porous additively manufactured parts using Deep Learning
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Numerical performances of invariable and moving boundary methods during fluid penetration into anisotropic porous media
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Pore structure and properties of porous geopolymer based on pre-swelled bentonite
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Mechanism of dewatering porous structures with supercritical carbon dioxide
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