Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Vapor Permeation Characteristics of TiO2 Composite Membranes Prepared on Porous Stainless Steel Support by Sol-Gel Method

  • Lee, Yoon-Gyu (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT), Catalysis and Reaction Engineering Lab, Department of Chemical Engineering, Korea University) ;
  • Lee, Dong-Wook (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Kim, Sang-Kyoon (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Sea, Bong-Kuk (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Youn, Min-Young (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Lee, Kwan-Young (Catalysis and Reaction Engineering Lab, Department of Chemical Engineering, Korea University) ;
  • Lee, Kew-Ho (Membrane and Separation Research Center, Korea Research Institute of Chemical Technology (KRICT))
  • Published : 2004.05.20
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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 $SiO_2$ 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 ${\gamma}-Al_2O_3$. Microstructure of titania membrane was affected by heat-treatment and synthesis conditions of precursor sol, and titania formed at calcination temperature of 300$^{\circ}C$ with sol of [$H^+$]/[TIP]=0.3 possessed surface area of 210 $m^2$/g, average pore size of 1.25 nm. The titania composite membrane showed high $H_2/N_2$ 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.

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