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Porous Ca Framework with High CO₂/N₂ Selectivity
Summary:
The authors from Stony Brook University, Rutgers University, and Brookhaven National Laboratory developed a thermally stable microporous calcium coordination network [Ca(SDB)]·H₂O, achieving high CO₂/N₂ selectivity in flue gas CO₂ capture.
Background:
1. To address CO₂ separation from gas streams, previous researchers used zeolites and Mg-based MOFs, but Ca-based coordination networks suffered structural collapse after activation, lacking porosity.
2. The authors synthesized a robust Ca-based coordination network with sustainable pores, realizing high CO₂ adsorption and selectivity without open metal sites.
Research Content:
1. Synthesis: The material was synthesized via solvothermal method by reacting CaCl₂·xH₂O with 4,4'-sulfonyldibenzoate (SDB) in 95% ethanol at 180℃ for 5 days.
2. Characterizations:
1) BET surface area: 145.15 m²/g; accessible volume of 18.2% (275 ų) for 1, 16% for activated 1'.
2) No SEM/TEM particle size data provided; single crystal analysis shows 3D network with 5.9 Å×5.8 Å square channels.
3) TGA: Dehydration below 250℃, thermal decomposition at ~575℃; PXRD confirms air stability for 2 days.
3. Application: Tested for CO₂/N₂ separation; 5.75 wt% CO₂ uptake at 273 K/1 atm, CO₂/N₂ selectivity 48-85 under flue gas conditions.
4. Mechanism: Small pore size and ionic Ca-O bonding promote quadruple interactions with CO₂, enabling high affinity without open metal sites.
Outlook:
This research develops a stable Ca-based porous material for efficient CO₂ capture, providing a new direction for designing low-cost, high-selectivity gas separation materials.
A Calcium Coordination Framework Having Permanent Porosity and High CO₂/N₂ Selectivity
Authors: Debasis Banerjee, Zhijuan Zhang, Anna M. Plonka, Jing Li, John B. Parise
DOI: 10.1021/cg300274n
Link: https://pubs.acs.org/doi/10.1021/cg300274n
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