| 초록 |
In industry, many kind of metal oxides with surface modifier are synthesized for various purpose and CeO2 is also one of them. When CeO2 is synthesized, it is obtained as suspension in organic solvent. If CeO2 is stored in organic solvent, various problems are occurred such as transportation difficulty, storage difficulty, particle aggregation, volatile solvent, and fire. To overcome these problems, drying process is needed. Conventionally, hot air drying and freeze drying are used as drying process of metal oxides with washing process of residual organic material. In this study, however, aerosol solvent extraction system(ASES) with supercritical CO2 is suggested as another drying process without washing process because of its advantages like less particle aggregation, less waste water, and less process time compared to conventional drying process. Dried CeO2 is analyzed by FT-IR, XRD, and HR-TEM. With these analyses, it is confirmed that cerium oxide is completely dried without residual organic material. In perspective of this study, it is thought that drying of other metal oxides by ASES using supercritical CO2 is also attractive process. |
