UNIST NBC SEMINAR Controlled hydrolysis of metalorganic frameworks
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-74 s (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, seemingly-amorphous samples were still porous and could maintain significant portion of micro-porosity. In the case of a series of M-MOF-74 s, 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 MOF 74 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, E 104 Prof. Wonyoung Choe(2546) choe@unist. ac. kr
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