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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 5
BKCSDE 25(5)
May 20, 2004

Title	Vapor Permeation Characteristics of TiO₂ Composite Membranes Prepared on Porous Stainless Steel Support by Sol-Gel Method
Author	Yoon-Gyu Lee, Dong-Wook Lee, Sang-Kyoon Kim, Bongkuk Sea, Min-Young Youn, Kwan-Young Lee, Kew-Ho Lee*
Keywords	Membrane separation, Titania, Sol-gel process, Vapor permeation, Dehydration
Abstract	Composite membranes with a titania layer were prepared by soaking-rolling method with the titania sol of nanoparticles formed in the sol-gel process and investigated regarding the vapor permeation of various organic mixtures. The support modification was conducted by pressing SiO2 xerogel of 500 nm in particle size under 10 MPa on the surface of a porous stainless steel (SUS) substrate and designed the multi-layered structure by coating the intermediate layer of γ-Al2O3. Microstructure of titania membrane was affected by heat-treatment and synthesis conditions of precursor sol, and titania formed at calcination temperature of 300 oC with sol of [H+]/[TIP]=0.3 possessed surface area of 210 m2/g, average pore size of 1.25 nm. The titania composite membrane showed high H2/N2 selectivity and water/ethanol selectivity as 25-30 and 50-100, respectively. As a result of vapor permeation for water-alcohol and alcohol-alcohol mixture, titania composite membrane showed water-permselective and molecular-sieve permeation behavior. However, water/methanol selectivity of the membrane was very low because of chemical affinity of permeants for the membrane by similar physicochemical properties of water and methanol.
Page	687 - 0
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