Enhanced CO2 adsorption and selectivity of CO2/N2 on amino-MIL-53(Al) synthesized by polar co-solvents

Document Type

Journal Article

Publication Title

Energy and Fuels

Publisher

American Chemical Society

School

School of Engineering

RAS ID

28279

Comments

Abid, H. R., Rada, Z. H., Duan, X., Sun, H., & Wang, S. (2018). Enhanced CO2 adsorption and selectivity of CO2/N2 on amino-MIL-53 (Al) synthesized by polar co-solvents. Energy & fuels, 32(4), 4502-4510.

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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.

DOI

10.1021/acs.energyfuels.7b03240

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