Abstract
A SiC-CeO₂ composite membrane was successfully fabricated using an ally-hydridopolycarbosilane (AHPCS) binder and treated by dip-coating at 60 times with a CeO₂ sol solution. The dip-coated SiC membrane was calcined at 773 K and then sintered at 1173 K under an air atmosphere. The coated membrane was characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM) and a BET surface analysis. The difference in permeation performance between H₂ and CO gases was measured by varying the temperature. The permeation flux of H₂ on the SiC membrane with layered CeO₂ was obtained as 8.45 × 10 -6 mol/㎡sPa at room temperature. The CO permeation flux was 2.64 × 10 -6 mol/㎡sPa at room temperature. The reaction enthalpy (ΔH°) for the hydrogen permeation process was calculated as .7.82 J/mol by Arrhenius plots.
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