期刊
CATALYSIS TODAY
卷 204, 期 -, 页码 85-93出版社
ELSEVIER
DOI: 10.1016/j.cattod.2012.08.014
关键词
MIL-125; NH2-MIL-125; Microwave synthesis; CO2 adsorption; H2O adsorption; Cycloaddition; Isoprene separation
资金
- National Research Foundation of Korea (NRF)
- Korean Government (MEST) [2010-0012257]
- National Research Foundation of Korea [2010-0012257] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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. (c) 2012 Elsevier B.V. All rights reserved.
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