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| Type |
Poster Presentation |
| Area |
Inorganic Chemistry |
| Room No. |
Exhibition Hall 2+3 |
| Time |
10월 19일 (목요일) 11:00~12:30 |
| Code |
INOR.P-27 |
| Subject |
Simple synthesis of MgCO3 and Na2Mg(CO3)2 through alkali metal nitrate medium
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| Authors |
Kyung-Ryul Oh, Kang Yeong Kim, Jin-Su Kwak, YOUNG UK KWON*
Department of Chemistry, Sungkyunkwan University, Korea
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| Abstract |
MgCO3 and Na2Mg(CO3)2 are anhydrous forms of magnesium carbonate, which are hard to synthesize in aqueous solution at ambient temperature and pressure because of large hydration energy of magnesium ion. Molten salt provides liquid medium at higher temperature than normal solvents, enabling the synthesis of various kinds of metal oxides. Furthermore, alkali metal nitrates are frequently used as promoting agents for MgO-based CO2 absorbent at intermediate temperature (200-500 °C). Based on these backgrounds, we synthesized pure crystalline anhydrous MgCO3 and Na2Mg(CO3)2 by heating hydromagnesite (MCH, 4MgCO3•Mg(OH)2•4H2O) and an alkali metal nitrate at 325 °C under CO2 flow. Water of hydration decomposes and Mg(OH)2 reacts with CO2 to form MgCO3 at given condition. The existence of Na2CO3 determines the products being MgCO3 or Na2Mg(CO3)2. Every kind of alkali metal nitrate successfully acted as a reaction medium, giving different particle morphology. The characterization of samples were performed by powder X-ray diffraction measurements (XRD), thermogravimetric analyzer (TGA), and field emission scanning electron microscopy (FE-SEM), which verified that the synthesized products are pure anhydrous rhombohedral MgCO3 and Na2Mg(CO3)2. |
| E-mail |
ohkyung1129@naver.com |
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120th General Meeting of the KCS