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졸-겔 가압코팅법을 이용한 TiO2복합막의 제조 및 기체 투과특성에 관한 연구
A Study on the Preparation and Gas Permeation Characteristics of TiO2 Composite Membrane by Sol-Gel Pressurized Coating Method
연세대학교 공과대학 화공생명공학부, 서울 120-749
School of Chemical Engineering and Biotechnology, Yonsei University, 134 Sudaemun-ku, Shinchon-Dong, Seoul 120-749, Korea
HWAHAK KONGHAK, August 2000, 38(4), 491-496(6), NONE
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Abstract
Acetyl acetone으로 개질한 티타늄 알콕사이드로부터 TiO2 졸을 제조한 후 다공성 α-알루미나 지지체에 가압코팅법을 사용하여 TiO2 복합분리막을 제조하였다. Acetyl acetone이 축합반응을 억제함으로써 제조된 졸의 입자크기는 5-10nm였다._x000D_
H2O/Ti4+≥2인 경우에 있어 첨가된 물의 양에 따른 입자크기가 10nm이하로 나타났다. 또한, 장시간의 숙성시간은 입자성장에는 영향을 주지 못하였다._x000D_
350℃에서 열처리한 분리막층은 균열이 없었고, 기공지름은 2-3 nm의 범위였다. 2 bar 로 4회 반복하여 졸을 코탱하엿을 때 복합막의 수소 및 질소의 기체투과율의 범위는 각각 68.5-99.6×10-7및18.2-32.7×10-7mol(m2mol/(m2·s·Pa)였다. 또한, 수소 및 질소의 투과율비로부터 계산된 이상적 분리계수가 Knudsen 확산에 의한 분리계수인 3.74와 거의 일치하는 3.76을 얻었다.
TiO2 sol was made from titanium alkoxide modified by acety acetone. Afer that, TiO2 composite membrane was prepared using the pressurized coating method. As acetyl acetone obstructed condensation reaction, the particle size of the sol was 5-10 nm. The range of particle diameter was under 10nm is case of H2O/Ti4+≥2. Also, long aging time couldn''''t affect particle growth. The top layer of separation membranes treated at 350℃ didn''''t crack and the pore diameter was 2-3nm. For the membranes, which was prepared by pressuized coating method for 4 times at 2 bar, the range of hydrogen and nitrogen permeance of composite membranes showed 8.5-99.6×10-7and 18.2-32.7×10-7mol(m2mol/(m2·s·Pa)respectively. And the ideal separation factor from the ratio of the H2 and N2 permeance was 3.76, which was in accordance with the value of Knudsen diffusion, 3.74.
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