Y 2 O 3-SiC composite membrane was dip-coated using Y 2 O 3 sol solution; this membrane was compared with a non-coated one. Each membrane was characterized by XRD, FE-SEM and BET techniques. Hydrogen and CO permeation were tested with selfmanufactured Sievert's type equipment. Y 2 O 3 coating was enhanced for the selectivity of the membrane (H 2 versus CO). The hydrogen permeation was measured at 1 bar with increasing temperatures. In case of the coated membrane, hydrogen permeation was found to be 1.24 x 10-7 mol/m 2 sPa with perm-selectivity of 4.26 at 323 K.
La 2 Ce 2 O 7 powder was synthesized through hydrolysis and polycondensation processes. A La 2 Ce 2 O 7 /SiC composite membrane was fabricated using SiC and La 2 Ce 2 O 7 powder with phenolic resin. For surface modification, Ni metal was coated onto the membrane via DC magnetron sputtering. The membranes were characterized by X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), and pore size distribution analyses. Hydrogen and CO gas permeation experiments were performed through the use of Sievert's type equipment. Both fluxes decreased with increasing temperature and followed the Knudsen and surface diffusion mechanisms. The hydrogen permeability of the membrane was determined as 1.17 × 10 −5 mol/m 2 sPa with a permselectivity (H 2 /CO) of 2.30 at 303 K.
Porous ceramic membranes consisting of Ce 1-x Y x O 2−δ were developed for hydrogen permeation tests. Various amounts (x = 0, 0.05, 0.1, 0.2) of yttrium were doped to ceria to study the effect of yttrium doping on ceria membranes on various properties, including hydrogen permeability. Ce 1−x Y x O 2−δ powder was synthesized by the sol-gel method. These membranes were fabricated by pressing and sintering at 1300°C for 6 h. As the amount of yttrium increased, the grain size of the membrane decreased. Hydrogen permeability was improved as the yttrium content increased. Selective permeability of hydrogen compared to CO is explained by electric conductivity. As the temperature rose, both the hydrogen perm-selectivity and electric conductivity on Ce 0.8 Y 0.2 O 1.9 improved.
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