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SDC-SSF双相透氧膜的表面优化及其氧渗透性能

作者：解品红，李芳，裴瑜洁，夏媛玉，王雨生，李其明

单位：辽宁石油化工大学，石油化工学院，辽宁抚顺，113001

关键词：双相透氧膜；刻蚀；多孔层；催化剂；透氧量

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2022,42(3):84-90

摘要：

首先通过溶胶凝胶法制备了SDC-SSF (75wt% Ce0.85Sm0.15O2-? -25wt% Sm0.6Sr0.4FeO3-)萤石-钙钛矿双相透氧膜，进而基于化学刻蚀技术在SDC-SSF双相透氧膜表面构筑了超微多孔结构，基于该多孔结构实现了高强度表面活化催化剂的负载。实验结果表明，通过化学刻蚀法可以有效去除双相膜表面的SSF钙钛矿相，则剩余SDC萤石相自发形成超微多孔结构。在多孔层表面涂覆低熔点含钴钙钛矿BSCCF（Ba0.4Sr0.4Ca0.2Co0.8Fe0.2O3-）催化剂粉体，二次高温烧后可以实现BSCCF催化剂的熔化和孔道渗入，从而在双相膜表面构筑了高强度BSCCF催化剂涂层。论文系统对比了原始基膜，多孔膜和负载催化剂膜的透氧膜量、活化能和速率控制步骤，研究发现经过化学刻蚀和催化剂负载后，双相透氧膜的透氧量会逐步增加，优化后的SDC-SSF双相膜片（厚度1.0mm）最高透氧量950℃可达到0.36ml.cm-2.min-1。通过Wagner方程理论分析可以发现通过化学刻蚀和催化剂涂层，SDC-SSF双相透氧膜的透氧速率控制步骤也在逐步发生变化，由表面交换控制为主转向体相控制转化。该研究提供了一种为双相透氧膜表面构筑高强度表面活化催化剂的有效方法。

SDC-SSF (75wt% Ce0.85Sm0.15O2-? -25wt% Sm0.6Sr0.4FeO3-?) dual phase oxygen permeable membranes were firstly synthesized by a sol-gel method. Then the ultra-microporous porous structure can be constructed on the surface of SDC-SSF oxygen permeable membranes by chemical etching method. The construction of the robust surface activation catalysts can be realized by means of porous layer. The experimental results show that SSF perovskite phase can be effectively leached out from the dual phase membrane by chemical etching, and thus the ultra-porous structure can be spontaneously formed based on the residual SDC fluorite particles. The cobalt-based perovskite catalysts with a lower melting point, Ba0.4 Sr0.4Ca0.2Co0.8Fe0.2O3-? (BSCCF), were coated onto SDC porous layer. After the second high temperature sintering, BSCCF perovskite catalysts can be melted and penetrate into SDC porous layer. Hence, a robust catalyst layer can be constructed on the surface of SDC-SSF dual phase membranes. In this paper, the oxygen permeation flux, the activation energy and rate-determining steps of the original membrane, the porous membrane and the membrane modified with the catalysts were compared systematically. It can be found that the oxygen permeation flux increases successively after chemical-etching and the catalyst loading. The maximum oxygen flux of the optimized 1.0 mm-thick SDC-SSF membrane reaches about 0.36 ml. cm-2. min-1 at 950oC. Through the analysis of Wagner equation, it can be found that the rate-determining step of SDC-SSF dual-phase membranes changes gradually from the surface exchanging control to the bulk diffusion control after chemical-etching and catalyst modifying. This study provides an effective method to construct a robust catalysis layer on the surface of dual-phase oxygen permeable membranes.

基金项目：

国家自然科学基金项目（21703091, 21201096）；辽宁省教育厅资助项目 (L2019009)；辽宁科技厅计划指导项目（2019-ZD-0058）。

作者简介：

解品红（1996年-），女，在读硕士， 1771593694@qq.com；研究方向：膜分离材料研究。

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