Improving CO2 Separation Performance of MIL-53(Al) by Incorporating 1-n -Butyl-3-Methylimidazolium Methyl Sulfate

Energy Technology : Generation, Conversion, Storage, Distribution
Harun KulakAlper Uzun

Abstract

1-n-Butyl-3-methylimidazolium methyl sulfate is incorporated into MIL-53(Al). Detailed characterization is done by X-ray fluorescence, Brunauer-Emmett-Teller surface area, scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, and thermogravimetric analysis. Results show that ionic liquid (IL) interacts directly with the framework, significantly modifying the electronic environment of MIL-53(Al). Based on the volumetric gas adsorption measurements, CO2, CH4, and N2 adsorption capacities decreased from 112.0, 46.4, and 19.6 cc (STP) gMIL-53(Al)-1 to 42.2, 13.0, and 4.3 cc (STP) gMIL-53(Al)-1 at 5 bar, respectively, upon IL incorporation. Data show that this postsynthesis modification leads to more than two and threefold increase in the ideal selectivity for CO2 over CH4 and N2 separations, respectively, as compared with pristine MIL-53(Al). The isosteric heat of adsorption (Qst) values show that IL incorporation increases CO2 affinity and decreases CH4 and N2 affinities. Cycling adsorption-desorption measurements show that the composite could be regenerated with almost no decrease in the CO2 adsorption capacity for six cycles and confirm the lack of any significant IL leaching. The results offe...Continue Reading

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Citations

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BETA
X‐ray

Software Mentioned

Ideal Adsorbed Solution Theory ( IAST )

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