Synthesis of BCYF_0.10–YDC/BCYF_0.10–Ni Double Layer Dense Hollow Fiber Ceramic Membranes for Hydrogen Separation

The membrane materials of Ba_0.95Ce_0.8Y_0.2O_3–δF_0.10(BCYF_0.10) and Ce_0.8Y_0.2O_2–δ(YDC) ceramic powders were prepared by a sol–gel method. BCYF_0.10–YDC/BCYF_0.10–Ni double-layered asymmetric dense hollow fiber ceramic membrane was synthesized via co-spinning and co-sintering. The effects of spinning mixture composition and sintering temperature on the structure of hollow fiber membrane were investigated. The thickness of the dense layer, the interface between the two layers and the bending strength of the resultant hollow fiber membranes can be tuned by adjusting the ceramic powder loading in the inner and outer spinning solution. The thickness of the dense outer layer of the membrane is only 14.5 μm when the contents of ceramic powder in the inner and outer spinning solution are 65.7% and 44.4%, respectively. The two layers can be integrated well with the measured bending strength of 168.5 MPa. The prepared hollow fiber membranes were tested for hydrogen separation. At 900℃, when the feed gas (50% H₂+50% He) and the sweep gas (N₂) are controlled at 100 and 100 mL·min^–1, respectively, the hydrogen permeation flux of hollow fiber membrane is 0.54 mL·min^–1·cm^–2.