Journal
CHEMICAL ENGINEERING SCIENCE
Volume 147, Issue -, Pages 109-117Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2016.03.035
Keywords
MIL-101(Cr, Mg); CO2/N-2 separation; Adsorptionselectivity
Categories
Funding
- National Key Basic Research Program of China [2013CB733506]
- National Natural Science Foundation of China [21436005]
- National Science Fund for Distinguished Young Scholars of China [21225625]
- Research Foundation of State Key Lab of Subtropical Building Science of China [C715023z]
- Science and Technology Program of Guangzhou [201510010248]
- Guangdong Natural Science Foundation [2014A030312007]
- Fundamental Research Funds for the Central Universities
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A novel bimetallic MIL-101(Cr, Mg) was successfully synthesized for the first time by doping Mg during the solvothermal synthesis of MIL-101(Cr), and then characterized. The doped magnesium was homogeneously dispersed in the crystals of MIL-101(Cr, Mg). The magnesium ions had successfully coordinated with the carboxylic group in BDC through Mg-O. The synthesized MIL-101(Cr, Mg) remained excellent moisture-stability after exposed to humid air with 90% relative humidity for 30 days. Importantly, Mg doping not only made MIL-101(Cr, Mg) had higher surface area than MIL-101(Cr), but also created new and strong adsorptive sites for CO2 confirmed by TPD experiments. As a result, CO2 adsorption capacity of MIL-101(Cr, Mg) was significantly improved, and reached 3.28 mmol/g at 298 K and 1 bar, having an increase of 40% in comparison with MIL-101(Cr). More importantly, the CO2/N-2 adsorption selectivity of MIL-101(Cr, Mg) was significantly enhanced up to 86 at 100 kPa, being similar to 4 times of that of MIL-101(Cr). The strategy of doping metal ions can be an effective way to improve the adsorption performance of MOFs. (c) 2016 Elsevier Ltd. All rights reserved.
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