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

• DOI: 10.1016/j.micromeso.2011.12.034
• Publication Date: 2011-12-28T17:22:37Z
• Authors: Lei Wu; Ming Xue; Shi-Lun Qiu; Gérald Chaplais; Angélique Simon-M...; Joël Patarin
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The amino modified MIL-68(In), hereafter denoted by MIL-68(In)_NH 2 , 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, 1 H NMR spectroscopy and TG analysis demonstrates that this porous coordination network possesses the Kagome topology of MIL-68(In) with amino modified pores walls. The Brunauer–Emmett–Teller surface area of 1230 ± 24 m 2 g −1 for MIL-68(In)_NH 2 compared to 1028 ± 29 m 2 g −1 for MIL-68(In) exhibits an surface area improvement of approximate 200 m 2 g −1 within MIL-68(In)_NH 2 . Moreover, for both hybrids, the hydrogen and carbon dioxide sorption properties have been studied at 77 K and 87 K, and at 273 K and 298 K, 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 H 2 and CO 2, whereas, slightly effect on the integral sorption amount. Besides, to our knowledge, it is the first time that the CO 2 adsorption of MIL-68(In) sample are reported.