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이산화탄소 분리용 복합 알루미나 막의 제조
Manufacture of Alumina Composite Membranes for CO2 Separation
HWAHAK KONGHAK, October 1995, 33(5), 570-579(10), NONE
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Abstract
솔-젤법에 의하여 코팅용 솔을 만들고, 이 솔을 이용하여 알루미나 복합막을 제조하였다. AlOOH솔은 Yoldas법에 의하여 준비하였으며, HCl/알콕사이드 몰비가 0.07인 솔이 가장 투명하고 입자의 크기도 최소였다. 이 솔은 비지지 Υ-알루미나 막의 제조에서 최대의 표면적을 나타내었다. ALOOH 솔을 지지체에 코팅-건조-열처리를 반복하여 기공이 큰 α-알루미나 위에 기공이 작은 γ-알루미나 층을 형성하였다. 침적코팅, 진공코팅 및 펌프코틴의 3가지 코팅법을 시도하였으며, 0.8M의 솔로 3회아상 코팅-건조-열처리하는 것이 필요하였다. 코팅-건조를 반복한 후 최종적으로 열처리하거나, 너무 진한 솔을 사용할 경우에는 균열이 생기거나 코팅층이 벗겨지기 쉬웠다. 실리카나 CaO 용액을 사용하여 알루미나 복합막의 표면을 개지할 수 있었다. 사용하는 용액에 따라서 도판트의 분포를 조절할 수 있었다.
Alumina composite membranes were manufactured using coating sols witch were synthesized through sol-gel method. The AlOOH sol, prepared with the Yoldas Method, appeared the most transparent and contained the smallest. Particles when the HCl/alkoxide molar ratio was 0.07. The same sol resulted in the unsupported γ-alumina membrane with the largest surface area. γ-Alumina layers with small pores were formed on top of the -alumina supports with larger pores by repeating the coating-drying-calcining cycle with AlOOH sols. Dip coating, vacuum coating and pump coating methods were applied and at least 3 coating-drying-calcining cycles were necessary with 0.8 M sols. Crack formation or peeling of coating layers were frequently observed when repeated coating-drying cycles were followed by final calcining or concentrated sols were used. Surfaces of alumina composite membranes could be modified with silica or CaO. Distribution of dopant could be controlled by changing the solutions.
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Kusakabe K, Ichiki K, Morooka S, J. Membr. Sci., 95(2), 171 (1994)
Cho YK, Han KW, Lee KH, J. Membr. Sci., 104(3), 219 (1995)
Brinker CJ, Keefer KD, Scherer DW, Ashley CS, J. Non-Cryst. Solids, 48, 47 (1982)
Yoldas BE, Ceram. Bull., 54(3), 289 (1975)
Leenaars AFM, Keizer K, Burggraaf AJ, J. Colloid Interface Sci., 105(1), 27 (1985)
Lombardi T, Klein LC, Adv. Ceram. Mater., 3(2), 167 (1988)
Albani MID, Arciprete CP, J. Membr. Sci., 69, 21 (1992)
Hyun SH, Kang BS, Choi DJ, J. Korean Ceram. Soc., 29(12), 970 (1992)
Hyun SH, Yoon SP, Kim JH, J. Korean Ceram. Soc., 30(3), 189 (1992)
Uhlhorn RJR, Keizer K, Huis In't Veld MHBJ, Burggraaf AJ, J. Mater. Sci. Lett., 8, 1135 (1989)
