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J. Korean Ceram. Soc. > Volume 40(8); 2003 > Article
Journal of the Korean Ceramic Society 2003;40(8): 758.
doi: https://doi.org/10.4191/kcers.2003.40.8.758
CH3COOH 농도가 수열법으로 제조된 Fe2O3 담지 감마알루미나 촉매의 특성에 미치는 영향
박병기, 이정민1, 서동수
충남대학교 재료공학과
1한국화학연구원 화학공정연구센터
Effect of CH3COOH Concentration on Characteristics of Fe2O3Supported δ-alumina Catalyst by Hydrothermal Method
The cylindrical ${gamma}$-alumina pellets were prepared by forming, hydration, drying and calcination after mixing amorphous alumina and pore generating agent with water. Concentration of Fe(NO$_3$)$_3$ㆍ9$H_2O$ that was catalyst precursor was fixed and made mixing solution that changed concentration of $CH_3$COOH in range of 2.5~20%, and here ${gamma}$-alumina pellets were immerged and were hydrothermaly treated for 3 h at $200^{circ}C$. And then we investigated creation and change of crystal, pore characteristics, $N_2$ adsorption and desorption isotherms, changes of acid site and mechanical strengths etc. According to the concentration of $CH_3$COOH, the crystals grew to acicular shape of 0.5~2${mu}m$ length, and crystal structure showed the pseudo-boehmite structure. When hydrothermaly treated in 10% $CH_3$COOH solution, pore volume between 100~1000 $AA$ was highest by 0.86 cc/g, and width of hysteresis curved line due to $N_2$ adsorption/desorption appeared as was smallest. When concentration of $CH_3$COOH was in range of 5~15%, new C-H functional groups were formed. Mechanical strength of pellets was highest by 1.35 MPa when $CH_3$COOH concentration was 2.5%.
Key words: Amorpphous alumina, Boehmite, $\gamma$-alumina, Catalytic support, iron oxide catalyst
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