Open AccessReactionary-solidified oxygen permeable membrane material based on cermet Bi1.6Er0.4O3 – 26 wt % Ag – 4 wt % In
Author(s) -
S. V. Fedorov,
А. С. Лысенков,
I. V. Kulbakin
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/848/1/012019
Subject(s) - oxygen , oxygen permeability , materials science , cermet , membrane , selectivity , nitrogen , microstructure , porosity , analytical chemistry (journal) , chemistry , composite material , chromatography , organic chemistry , ceramic , biochemistry , catalysis
Using hot uniaxially pressing in argon atmosphere at 800 °C and at a stress of 6 MPa, the high-density reactionary-solidified cermet material based on Bi 1.6 Er 0.4 O 3 - 26 wt % Ag - 4 wt % In with total porosity of less than 0.3 % was firstly synthesized. The relationship between phase composition, microstructure, oxygen permeability coefficient, and oxygen selectivity (vs air nitrogen) of this material before and after its long-term (100 hours) operation as an ion transport membrane was established. The dependences of oxygen transport through this cermet material at 650-800 °C were investigated: for example, at 800 °C and at a ratio of oxygen partial pressures on both sides of the membrane of about 20, the oxygen transfer regime changes from diffusion to kinetics while the characteristic thicknesses of membrane were of 0.11 cm. It was shown that at 800 °C the membrane material based on Bi 1.6 Er 0.4 O 3 - 26 wt % Ag - 4 wt % In had an oxygen permeability coefficient of 1.1 • 10 −8 mol/cm/s, while its selectivity for oxygen (over nitrogen) was about 100. The decrease in oxygen flux by 1.3-1.5 times during 100 hours of work at 700-800 °C with a slight change in oxygen selectivity was observed, thus the possible causes of this phenomenon were explained.