UNIST NBC SEMINAR
Controlled hydrolysis of metalorganic frameworks
Speaker : Jaheon Kim, Ph.D.
Department of Chemistry, Soongsil University
Carbon dioxide capture using metal-organic frameworks (MOFs) is more
advantageous in terms of energy cost than chemical absorption methods. However,
as the quantity of carbon dioxide emitted every day from power plants is enormous,
we need to prepare the capturing materials as cheap as possible as well as to
enhance their working capability. One possible strategy is to hydrolyze partially
inexpensive microporous MOFs so that their porosity is tuned to have increased
carbon dioxide adsorption capacity and selectivity over nitrogen gas. We have
applied this idea to some famous MOFs such as HKUST-1 and M-MOF-74s (M = Mg,
Co, Ni, and Zn divalent ions). After hydrolyzing their crystals with neutral or basic
aqueous solutions, the collected samples were investigated by measuring their X-ray
power diffraction patterns and gas adsorption isotherms. Interestingly, seeminglyamorphous samples were still porous and could maintain significant portion of
micro-porosity. In the case of a series of M-MOF-74s, the porosity change pattern
was remarkably different among the MOFs with depending on the sort of
framework metal ions. This result has been further used to make mixed-metal MOF74 for selective dissolution of frameworks. With these hydrolysis results, carbon
dioxide capture and syntheses of new MOFs are also presented.
16:00 PM on Dec 13 (Thur)
Engineering Building 1, E104
Prof. Wonyoung Choe(2546)
[email protected]