采用干湿法纺丝技术制备Sr0.7Ba0.3Fe0.9Mo0.1O3-δ(SBFM)中空纤维支撑体,以Nb2O5掺杂的Sr Co0.8Fe0.2O3-δ(SCFNb)为膜材料,采用旋转喷涂结合共烧结技术制备出担载型SCFNb/SBFM中空纤维氧渗透膜。借助于XRD、SEM、热膨胀分析、透氧及...采用干湿法纺丝技术制备Sr0.7Ba0.3Fe0.9Mo0.1O3-δ(SBFM)中空纤维支撑体,以Nb2O5掺杂的Sr Co0.8Fe0.2O3-δ(SCFNb)为膜材料,采用旋转喷涂结合共烧结技术制备出担载型SCFNb/SBFM中空纤维氧渗透膜。借助于XRD、SEM、热膨胀分析、透氧及膜反应性能测试等手段,分别对样品的晶相结构、膜微观结构、支撑体与膜层的烧结行为、膜的氧渗透通量及膜反应性能进行了研究。结果表明,膜层与支撑体的晶相结构仍保持钙钛矿主体相。支撑体具有单一海绵孔/指状孔结构,膜厚为5?m且致密无缺陷,膜层与支撑体结合良好。在900℃时,氧渗透通量达到0.74 m L/(cm2·min)。850℃下甲烷部分氧化膜反应稳定操作超过200 h,稳态下氧渗透通量为4.5 m L/(cm2·min)。研究表明,担载型SCFNb/SBFM中空纤维氧渗透膜具有较高的氧渗透通量,同时具有良好的膜反应稳定性。展开更多
Mixed-conducting oxygen permeable membranes represent a class of novel ceramic membranes, which exhibit mixed oxygen ionic and electronic conductivities. At high temperatures, oxygen can permeate through the membrane ...Mixed-conducting oxygen permeable membranes represent a class of novel ceramic membranes, which exhibit mixed oxygen ionic and electronic conductivities. At high temperatures, oxygen can permeate through the membrane from the high to low oxygen pressure side under an oxygen concentration gradient. Theoretically, the permselectivity of oxygen is 100%. Recently, anovel mixed-conducting membrane-Ba0.5Sr0.5Coo.8Feo.2O3-δ has been developed, which showsextremely high oxygen permeability and promising stability. Furthermore, the reactor made with such membranes was successfully applied to the partial oxidation of methane to syngas reaction using air as the oxygen source, which realized the coupling of the separation of oxygen from air and the partial oxidation of membrane reaction in one process. At 850℃, methane conversion 】 88%, CO selectivity 】97% and oxygen permeation rate of about 7.8 mL/(cm2 ·min) were obtained.展开更多
文摘采用干湿法纺丝技术制备Sr0.7Ba0.3Fe0.9Mo0.1O3-δ(SBFM)中空纤维支撑体,以Nb2O5掺杂的Sr Co0.8Fe0.2O3-δ(SCFNb)为膜材料,采用旋转喷涂结合共烧结技术制备出担载型SCFNb/SBFM中空纤维氧渗透膜。借助于XRD、SEM、热膨胀分析、透氧及膜反应性能测试等手段,分别对样品的晶相结构、膜微观结构、支撑体与膜层的烧结行为、膜的氧渗透通量及膜反应性能进行了研究。结果表明,膜层与支撑体的晶相结构仍保持钙钛矿主体相。支撑体具有单一海绵孔/指状孔结构,膜厚为5?m且致密无缺陷,膜层与支撑体结合良好。在900℃时,氧渗透通量达到0.74 m L/(cm2·min)。850℃下甲烷部分氧化膜反应稳定操作超过200 h,稳态下氧渗透通量为4.5 m L/(cm2·min)。研究表明,担载型SCFNb/SBFM中空纤维氧渗透膜具有较高的氧渗透通量,同时具有良好的膜反应稳定性。
文摘Mixed-conducting oxygen permeable membranes represent a class of novel ceramic membranes, which exhibit mixed oxygen ionic and electronic conductivities. At high temperatures, oxygen can permeate through the membrane from the high to low oxygen pressure side under an oxygen concentration gradient. Theoretically, the permselectivity of oxygen is 100%. Recently, anovel mixed-conducting membrane-Ba0.5Sr0.5Coo.8Feo.2O3-δ has been developed, which showsextremely high oxygen permeability and promising stability. Furthermore, the reactor made with such membranes was successfully applied to the partial oxidation of methane to syngas reaction using air as the oxygen source, which realized the coupling of the separation of oxygen from air and the partial oxidation of membrane reaction in one process. At 850℃, methane conversion 】 88%, CO selectivity 】97% and oxygen permeation rate of about 7.8 mL/(cm2 ·min) were obtained.
