A Small-Crystallite Metal–Organic Framework for Efficient CO2 Capture from Flue Gas
- 1State Key Laboratory of Porous Materials for Separation and Conversion, Southwest Research & Design Institute of the Chemical Industry, Chengdu 610225, China
- 2State Key Laboratory of Structural Chemistry, Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, and Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 361021, China
Abstract
Pressure swing adsorption (PSA) is a promising technology for low-energy CO2 capture from flue gas, but its development is hindered by the lack of advanced adsorbents. Aluminum formate (ALF) shows satisfactory CO2 adsorption capacity but suffers from slow adsorption kinetics. Herein, we present a citric acid modification strategy to synthesize SNALF—an ultramicroporous ALF with small crystallite size and abundant defect sites—using nano-sized boehmite as the aluminum source. SNALF-3-90 achieved a CO2 adsorption capacity of 2.45 mmol/g within 3 min. In PSA testing with simulated flue gas (11 vol.% CO2, 82.5 vol.% N2, 6.5 vol.% O2), the CO2 concentration was enriched from 11% to over 42% with 90.13% recovery and productivity of 0.80 NL/min. DFT calculations reveal that the ligand-defective SNALF surface enables strong exothermic adsorption, confirming that the introduced defects act as active centers for CO2 capture. This work demonstrates that defect engineering combined with crystallite size reduction significantly enhances the CO2 adsorption kinetics of ALF, making it viable for large-scale PSA-based flue gas capture.
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BibTeX
@article{yuan2026smallcrystallite,
title = {{A Small-Crystallite Metal–Organic Framework for Efficient CO2 Capture from Flue Gas}},
author = {Ying Yuan and Chen Huang and Yu-Jia Chen and Xu Li and Hong-Wei Chen and Li-You Liang and De-Hua Lu and Min Liu and Ya-Min Wu and An-Min Zhao and Yi-Hong Wu and Yan-Xin Chen},
journal = {Molecules (Basel, Switzerland)},
year = {2026},
month = oct,
doi = {10.3390/molecules31193500},
url = {https://europepmc.org/article/PMC/PMC13666323},
note = {CC BY},
}
RIS
TY - JOUR
TI - A Small-Crystallite Metal–Organic Framework for Efficient CO2 Capture from Flue Gas
AU - Ying Yuan
AU - Chen Huang
AU - Yu-Jia Chen
AU - Xu Li
AU - Hong-Wei Chen
AU - Li-You Liang
AU - De-Hua Lu
AU - Min Liu
AU - Ya-Min Wu
AU - An-Min Zhao
AU - Yi-Hong Wu
AU - Yan-Xin Chen
PY - 2026
DA - 2026/10/01
JO - Molecules (Basel, Switzerland)
DO - 10.3390/molecules31193500
UR - https://europepmc.org/article/PMC/PMC13666323
AB - Pressure swing adsorption (PSA) is a promising technology for low-energy CO2 capture from flue gas, but its development is hindered by the lack of advanced adsorbents. Aluminum formate (ALF) shows satisfactory CO2 adsorption capacity but suffers from slow adsorption kinetics. Herein, we present a citric acid modification strategy to synthesize SNALF—an ultramicroporous ALF with small crystallite size and abundant defect sites—using nano-sized boehmite as the aluminum source. SNALF-3-90 achieved a CO2 adsorption capacity of 2.45 mmol/g within 3 min. In PSA testing with simulated flue gas (11 vol.% CO2, 82.5 vol.% N2, 6.5 vol.% O2), the CO2 concentration was enriched from 11% to over 42% with 90.13% recovery and productivity of 0.80 NL/min. DFT calculations reveal that the ligand-defective SNALF surface enables strong exothermic adsorption, confirming that the introduced defects act as active centers for CO2 capture. This work demonstrates that defect engineering combined with crystallite size reduction significantly enhances the CO2 adsorption kinetics of ALF, making it viable for large-scale PSA-based flue gas capture.
SN - 1420-3049
ER -