| The perovskite ceramic hollow fiber membrane for oxygen permeation was concerned widely due to its high separation-efficiency,low energy consumption,easily installation and 100%selectivity for oxygen.However,the industrial production and application of perovskite hollow fiber membranes is limited by their complicated preparation process,high cost,high energy consumption of the repeated temperature,exhaust pollution and thermal expansion.In this paper,the preparation of ceramic oxygen-permeable membrane material and the preparation of hollow fiber membrane were combined to prepare BaBi0.05Co0.85Zr0.1O3-?(BBCZ)ceramic hollow fiber oxygen-permeable membrane through one-step sintering,which reduced the preparation process,Hollow fiber membrane oxygen permeability of the industrial production;the same time,to explore the amount of Zr element BBCZ hollow fiber membrane oxygen permeability and thermal expansion of oxygen permeability and other properties.Using metal oxides and carbonates as the source of metal ions,the compact BBCZ ceramic hollow fiber oxygen permeable membrane was prepared directly by the phase inversion-sintering technique after the wet ball milling was uniformly mixed.The perovskite ceramic hollow fiber oxygen permeable membrane can be obtained by directly forming the perovskite phase after the metal oxide and the carbonate powder are sintered at a high temperature under the condition of a binder.The prepared ceramic hollow fiber membrane mechanical strength reached 75.83 MPa.When the purge gas is Ar(flow rate is 150 mL/min)and the feed gas is air(flow rate is 150 mL/min),when the test temperature is 650?,O2 is detected on the permeate side and the test temperature is 1000? oxygen permeation flux reached 5.01 mLmin-1cm-2,higher than the industrial application of ceramic hollow fiber membrane oxygen permeability of 30.2%.The BaBi0.05Co0.95-xZrxO3-?(x = 0,0.05,0.1,0.15,0.2)ceramic hollow fiber membrane was prepared by changing the doping amount of Zr.The effects of Zr doping on the corrosion resistance of BaBi0.05Co0.95O3-? membrane material properties.With the increase of Zr content,the mechanical strength of the prepared hollow fiber membrane gradually increases,reaching 110.54 MPa when the doping amount is 0.2.The coefficient of thermal expansion decreases gradually and decreases to 12.26×10-6 K-1 when the doping amount is 0.2,which is 57.3%lower than that of BaBi0.05Co0.95O3-?,which effectively improves the thermal expansion of the material.The oxygen permeation flux showed the trend of first increasing and then decreasing.Under the same test conditions,the oxygen permeability was the highest when the doping amount was 0.1.The mechanical strength of the hollow fiber membrane prepared by Zr doping of 0.15 was 87.73 MPa,the thermal expansion coefficient is 15.76×10-6K-1,the maximum oxygen permeability reached to 4.54 mLmin-1cm-2 at 1000?,which showed the best overall performance. |
PDF Full Text Request