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Type: Journal article
Title: Enhanced CO₂ adsorption and selectivity of CO₂ /N₂ on amino-MIL-53(Al) synthesized by polar co-solvents
Other Titles: Enhanced CO(2) adsorption and selectivity of CO(2) /N(2) on amino-MIL-53(Al) synthesized by polar co-solvents
Author: Abid, H.
Rada, Z.
Duan, X.
Sun, H.
Wang, S.
Citation: Energy and Fuels, 2018; 32(4):4502-4510
Publisher: American Chemical Society
Issue Date: 2018
ISSN: 0887-0624
Statement of
Hussein Rasool Abid, Zana Hassan Rada, Xiaoguang Duan, Hongqi Sun, and Shaobin Wang
Abstract: Amino-MIL-53(Al) was solvothermally synthesized using co-solvents, such as methanol (M), ethanol (E), methanol/acetic acid (MA), or ethanol/acetic acid (EA), as modulators with dimethylformamide (D). The effects of co-solvents on physicochemical properties of amino-MIL-53(Al) were investigated. It was found that the addition of co-solvents in the synthesis leads to the reduction of crystallinity and crystal size of the samples. The textural properties, such as specific surface area and porous structure, were manipulated. Amino-MIL-53-DMA exhibited the highest Brunauer–Emmett–Teller surface area of 632 m²/g as a result of the loss of the bridging hydroxyl group, while amino-MIL-53, amino-MIL-53-DE, amino-MIL-53-DEA, and amino-MIL-53-DM presented the surface areas of 400, 356, 321, and 348 m²/g, respectively. However, the primary amine groups were maintained on the surface of all of the amino-MIL-53 samples. The co-solvents enhanced CO2 adsorption on modified amino-MIL-53. CO₂ adsorption capacities on amino-MIL-53, amino-MIL-53-DM, amino-MIL-53-DE, amino-MIL-53-DEA, and amino-MIL-53-DMA are 48, 71, 67, 54, and 75 cm³/g, respectively, at standard conditions (1 atm and 273 K). CO₂ adsorption heat could be reduced to 24 kJ/mol on amino-MIL-53-DMA, giving it as a promising adsorbent for carbon dioxide storage at ambient conditions. Besides, the selectivity of CO₂/N₂ on amino-MIL-53-DEA and amino-MIL-53-DE demonstrates an unprecedentedly separating factor of 637 at 1 atm and 273 K, whereas the separating factors of CO₂/N₂ on amino-MIL-53, amino-MIL-53-DMA, and amino-MIL-53-DM are only 43, 43, and 153, respectively. Amino-MIL-53-DEA and amino-MIL-53-DE impressively outperform other MOFs and exhibit as an auspicious adsorbent for CO₂ N₂ separation.
Description: Published: December 17, 2017. Special Issue: 6th Sino-Australian Symposium on Advanced Coal and Biomass Utilisation Technologies
Rights: © 2017 American Chemical Society
RMID: 0030095335
DOI: 10.1021/acs.energyfuels.7b03240
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Appears in Collections:Chemical Engineering publications

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