Amino-modified MIL-68(In) with enhanced hydrogen and carbon dioxide sorption enthalpy

• Published in: Microporous and mesoporous materials Vol. 157; pp. 75 - 81
• Main Authors: Wu, Lei, Xue, Ming, Qiu, Shi-Lun, Chaplais, Gérald, Simon-Masseron, Angélique, Patarin, Joël
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.07.2012
• Subjects: CO2 sorption; H2 sorption; MIL-68(In)_NH2; MOFs; H2 sorption; CO2 sorption; MOFs; MIL-68(In)_NH2
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2011.12.034

[Display omitted] ► An amino modified MIL-68(In) (named MIL-68(In)_NH2) has been synthesized. ► Surface area gain approximate 200m2g−1 within MIL-68(In)_NH2 compared to MIL-68(In). ► The adsorption enthalpy of H2 and CO2 is enhanced by the modification of amino groups into MIL-68(In). The amino modified MIL-68(In), hereafter denoted by MIL-68(In)_NH2, has been obtained by self-assembling from 2-amino-terephthalic acid and indium nitrate hydrate. The characterization of the modified material based on powder X-ray diffraction analysis, IR spectroscopy, 1H NMR spectroscopy and TG analysis demonstrates that this porous coordination network possesses the Kagomé topology of MIL-68(In) with amino modified pores walls. The Brunauer–Emmett–Teller surface area of 1230±24m2g−1 for MIL-68(In)_NH2 compared to 1028±29m2g−1 for MIL-68(In) exhibits an surface area improvement of approximate 200m2g−1 within MIL-68(In)_NH2. Moreover, for both hybrids, the hydrogen and carbon dioxide sorption properties have been studied at 77K and 87K, and at 273K and 298K, respectively. The comparison of the corresponding results of MIL-68(In) shows that the presence of amino group can effectively enhance the adsorption enthalpy of H2 and CO2, whereas, slightly effect on the integral sorption amount. Besides, to our knowledge, it is the first time that the CO2 adsorption of MIL-68(In) sample are reported.