Adsorption/catalytic properties of MIL-125 and NH2-MIL-125

作者：Kim, Se-Na; Kim, Jun; Kim, Hee-Young; Cho, Hye-Young; Ahn, Wha-Seung^*

来源：Catalysis Today, 2013, 204: 85-93.

DOI：10.1016/j.cattod.2012.08.014

• MIL-125
• NH2-MIL-125
• Microwave synthesis
• CO2 adsorption
• H2O adsorption
• Cycloaddition
• Isoprene separation

A Ti-incorporated metal organic framework structure, MIL-125, and its amine-functionalized form, NH2-MIL-125, were synthesized via a solvothermal route aided by microwave heating. The samples were characterized by XRD, SEM, TGA, EA, UV-vis spectroscopy, and N-2 adsorption-desorption measurements. MIL-125 was unstable in aqueous solution, but NH2-MIL-125 was stable both in water and in heptane; its hydrophilic property was further confirmed by water vapor adsorption. NH2-MIL-125 showed moderate CO2 adsorption capacity (136 mg g(-1)) but excellent selectivity over N-2 (>27:1) at 298 K with a low heat of adsorption surpassing the performance of MIL-125. Four consecutive CO2 adsorption-desorption cycles over NH2-MIL-125 showed completely reversible adsorbent regeneration at 298 K under a helium flow for a total duration of 550 min. Catalytic properties of the materials were evaluated by cycloaddition of epichlorohydrin and oxidative desulfurization of dibenzothiophene. Finally, batch mode liquid-phase competitive separation of isoprene from 2-methyl butane was conducted, revealing high selectivity of isoprene against 2-methyl butane (ca. 7.8 and 9.7) over MIL-125 and NH2-MIL-125, respectively.

• 出版日期2013-4-15