| 허니컴에 코팅한 마그네타이트의 미세구조 및 CO2 분해특성 |
| 윤용운, 김은배1, 이병하1, 고태경2, 오재희 |
인하대학교 세라믹공학과
1명지대학교 무기재료공학
2인하대학교 세라믹공학 |
| The Microstructure of Magnetite Coated on Honeycomb and Characteristics of CO2 Decomposition |
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| ABSTRACT |
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In this study, we fabricated magnetite coated on a cordierite honeycomb which has complex shape by ultrasound-enhanced ferrite plating. The effects of the plating condition on the formation of the magnetite and its microstructure were investigated. The magnetite coated on the honeycomb became an oxygen-deficient ferrite by H$_2$ gas reduction, then the effects of the molar concentrations of ammonium acetate for $CO_2$ gas decomposition have been studied. As the molar concentration of a pH buffer($CH_3$COONH$_4$, 0.1946∼0.3892 M) solution increased, the average particle size increased about 200∼250 nm. The magnetite coated on the honeycomb was reduced by H$_2$ gas for 2 h at 30$0^{circ}C$. The inner pressure change in the cell began to occur at 315∼34$0^{circ}C$. The H$_2$-Reduced magnetite coated on the honeycomb at 35$0^{circ}C$ contained an oxygen deficient magnetite and $alpha$-Fe phase. The thermogravimetric analysis with H$_2$ reduction and $CO_2$ decomposition were carried out with the magnetite coated on the honeycomb. A weight loss in process of H$_2$ reduction occurred between 32$0^{circ}C$ and 34$0^{circ}C$, while a weight gain was observed during the $CO_2$ decomposition. |
| Key words:
Ferrite plating, Oxygen-Deficient ferrite, $CO_2$ decomposition |
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