Effect of the La/W ratio in lanthanum tungstate on the structure, stability and hydrogen permeation properties

被引:20
作者
Chen, Yan [1 ,2 ,3 ]
Wei, Yanying [1 ]
Xie, Huiqi [1 ]
Zhuang, Libin [1 ]
Wang, Haihui [1 ]
机构
[1] South China Univ Technol, Sch Chem & Chem Engn, 381 Wushan Rd, Guangzhou 510640, Guangdong, Peoples R China
[2] Shanghai Normal Univ, Dept Chem & Chem Engn, Educ Minist, Key Lab Resource Chem, 100 Guilin Rd, Shanghai 200234, Peoples R China
[3] Shanghai Normal Univ, Dept Chem & Chem Engn, Shanghai Key Lab Rare Earth Funct Mat, 100 Guilin Rd, Shanghai 200234, Peoples R China
关键词
Membrane; Hydrogen permeation; Mixed proton-electron conductor; Lanthanum tungstate; ELECTRICAL-CONDUCTIVITY; CRYSTAL-STRUCTURE; PROTON; SEPARATION; MEMBRANE; MO; NIOBIUM;
D O I
10.1016/j.memsci.2017.08.031
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Lanthanum tungstates are the kind of attractive mixed proton-electron conductive (MPEC) oxides, which can be used as the hydrogen permeable membrane with almost infinite hydrogen selectivity in dry hydrogen-containing atmosphere theoretically. A series of lanthanum tungstates with different La/W ratios, La5.3WO11.25-delta (LWO53), La5.4WO11.25-delta (LWO54), La5.5WO11.25-delta (LWO55) and La5.6WO11.25-delta (LWO56), were prepared through a solid-state reaction method and the effect of La/W ratio on the membrane structure, stability and hydrogen permeation properties have been investigated. A pure cubic phase can be formed gradually with the increase in calcination temperature for lanthanum tungstates. The phase formation temperature increases with the increase in the La/W ratio, and a higher oxygen absorption capacity can be achieved in lanthanum tungstate with a higher La/W ratio. The hydrogen permeation flux through the lanthanum tungstate membranes increases slightly with an increase in La/W ratio, while the stability decreases. The lanthanum tungstate membrane with a La/W ratio of 5.5 may be a good candidate for hydrogen separation applications because of its favorable balance between stability and hydrogen permeability.
引用
收藏
页码:300 / 306
页数:7
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