摘要
主要研究了BCFN非对称透氧膜的制备。采用了3种不同的方式制备BCFN多孔支撑体,并对其渗透性能和孔隙分布进行分析,发现采用干压成型方式制备的多孔支撑体的综合性能较其它两者更为优越。同时在用浸渍工艺制备致密膜层的过程中,通过调整浆料浓度和浸浆时间可以有效地控制膜层厚度和完整性。在浓度为20%(质量分数)的浆料中浸渍2min,可得到厚度约30μm、没有裂纹且表面平整的致密层。透氧实验的结果表明,相同条件下非对称膜的透氧率比致密膜提高了3倍左右且可以在850℃温度下长时间稳定工作。
This paper focuses on the preparation of asymmetric membrane based on BCFN.Three different forming methods were used to prepare the porous support.Then,the porous support has been characterized in terms of gas permeability and pore distribution.On consideration of mechanical strength and permeability,the property of porous support obtained by dry pressing was better than those prepared by other forming methods.In addition,the thickness and quality of the dense layer can be controlled by adjusting the concentration of the suspension slurry.When the precursor was dipped into 20wt% aqueous slurry,followed by drying and co-firing,thus,dense layer(thickness:about 30μm)with high quality surface and no cracks was acquired.And it was found that the asymmetric structured membranes with the porous support showed remarkably higher oxygen permeability as compared with a conventional sintered disk-type membrane,which was as about 3times high as the symmetric membrane.The fabricated asymmetric can be used steadily for a long time at 850 ℃.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2016年第3期222-226,231,共6页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2006AA11A189)
国家自然科学基金资助项目(51274139)
上海教委创新基金资助项目(13YZ019)
博士点基金资助项目(20123108120020)
关键词
多孔支撑体
膜厚
浆料浓度
浸浆时间
透氧率
porous support
membrane thickness
slurry concentration
dipping time
oxygen permeability
