Measuring the oxygen profile and permeation flux across an ion transport (La0.9Ca0.1FeO3−δ) membrane and the development and validation of a multistep surface exchange model

2014 ◽  
Vol 468 ◽  
pp. 62-72 ◽  
Author(s):  
Anton Hunt ◽  
Georgios Dimitrakopoulos ◽  
Patrick Kirchen ◽  
Ahmed F. Ghoniem
Keyword(s):  
Ion Transport ◽  
Exchange Model ◽  
Permeation Flux ◽  
Surface Exchange ◽  
Oxygen Profile ◽  
Development And Validation

Surface exchange model for ITM membrane in transient stage

2017 ◽  
Vol 523 ◽  
pp. 614-622 ◽  
Author(s):  
C. Gazeau ◽  
E. Blond ◽  
M. Riechmann ◽  
P.-M. Geffroy ◽  
A. Batakis ◽  
...  
Keyword(s):  
Exchange Model ◽  
Surface Exchange ◽  
Transient Stage

Surface Exchange Model for MIEC Membrane in Transient Stage

2014 ◽  
Vol 64 (2) ◽  
pp. 243-249
Author(s):  
C. Gazeau ◽  
E. Blond ◽  
M. Reichmann ◽  
P.-M. Geffroy ◽  
T. Chartier ◽  
...  
Keyword(s):  
Exchange Model ◽  
Surface Exchange ◽  
Transient Stage

Electrotransport in the La2NiO4-based solid solutions

2019 ◽  
Vol 91 (6) ◽  
pp. 911-922 ◽  
Author(s):  
Vladimir A. Cherepanov ◽  
Artem R. Gilev ◽  
Evgeny A. Kiselev
Keyword(s):  
Ion Transport ◽  
Transport Properties ◽  
Solid Solutions ◽  
High Spin State ◽  
Size Factor ◽  
Electron Hole ◽  
Surface Exchange ◽  
Oxygen Ion ◽  
High Concentrations ◽  
Electron Holes

Abstract This work combines new and earlier obtained results on electron hole and oxygen-ion transport in the La2NiO4-based solid solutions. The effect of lanthanum substitution with Ca/Sr and nickel with Fe, Mn, Co or Cu on transport properties of La2−xAxNi1−yMeyO4+δ was analyzed and discussed at different substitution levels. Besides the changes in concentration and mobility of electron holes induced by the doping with cations of different nature, the partial transformation of Ni3+ from low-spin to high-spin state was shown to have a profound effect on transport properties of these materials leading to a notable decrease in mobility of electron holes, especially in the strontium-rich oxides. The obtained results suggested that the size factor was the main driving force behind the observed transformation of Ni3+. The oxygen-ion transport in La2−xAxNi1−yMeyO4+δ was characterized by significant surface exchange limitations, which can be reduced only at relatively high concentrations of strontium and iron, and should be taken into account while evaluating the ionic conductivity by means of oxygen permeation or the modified Hebb-Wagner polarization method.

Numerical Investigation of Oxygen Permeation Through a Ba0.5Sr0.5Co0.8Fe0.2O3−δ Ion Transport Membrane With Impingement Flow

2019 ◽  
Vol 142 (6) ◽  
Author(s):  
R. Ben-Mansour ◽  
Mohamed Hamdy ◽  
Y. Sanusi ◽  
A. Araoye ◽  
M. A. Habib ◽  
...  
Keyword(s):  
Ion Transport ◽  
Flow Rate ◽  
Clean Energy ◽  
Oxygen Permeation ◽  
Permeation Flux ◽  
Energy Applications ◽  
Ion Transport Membrane ◽  
Oxygen Permeation Flux ◽  
Flow Configurations ◽  
Sweeping Gas

Abstract Ion transport membrane (ITM) is considered to be one of the promising techniques for the separation of oxygen from the air for clean energy applications. Studying flow configurations of gases around Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) membrane is presented and discussed in this paper. The effects of the sweep mass flow rate and impingement configurations for the gases flow in the feed and permeation sides have been investigated. In this regard, flow with single or double impingement and impingement with different angles have been simulated and analyzed in order to identify the configurations that would provide the maximum permeation flux. Results show that increasing the sweep flow rate, directly, increases the oxygen permeation flux. It is also found that, in case of single impingement, decreasing the distance between the nozzle and the membrane (H), directly, increases the oxygen permeation flux for constant sweep side nozzle (slot) width (D). The permeation flux increases from around 2.9–3.66 µmole/cm2 s for the ratio H:D from1:1 to 1:4 (i.e., decreasing H to one-fourth of its value). Results show that the double impingement flow gives lower results than the single impingements by about 35.7%. The results also revealed that the optimum configuration is the parallel flow with vacuum in the sweeping side, which gives the highest permeation flux with an increase of more than 41% from that of the parallel configuration with a sweeping gas. Using carbon dioxide as a sweeping gas is better than helium.

scholarly journals Pure oxygen separation from air using dual-phase SDC-SCFZ disc membrane: A modelling approach

2021 ◽  
Vol 1195 (1) ◽  
pp. 012060
Author(s):  
J Chua ◽  
C Li ◽  
J Sunarso
Keyword(s):  
Oxygen Permeation ◽  
Operating Conditions ◽  
Perovskite Oxide ◽  
Pure Oxygen ◽  
Permeation Flux ◽  
Exchange Reactions ◽  
Surface Exchange ◽  
Conducting Phase ◽  
Oxygen Permeation Flux ◽  
Modelling Approach

Abstract Novel Ce0.8Sm0.2O1.9-SrCo0.4Fe0.55Zr0.05O3-δ (SDC-SCFZ) disc membranes consist of 25 wt.% SDC fluorite ionic conducting phase and 75 wt.% SCFZ perovskite mixed conducting phase, which is more promising than perovskite oxide SCFZ single-phase membrane in terms of the oxygen permeation flux. This work features a modelling approach to simulate the oxygen permeation fluxes of the SDC-SCFZ membrane. Simplified model equations from the Zhu model and Xu-Thomson model based on the limiting cases of surface exchange reactions and bulk diffusion are compared. The Zhu model is found to be more applicable for the membranes with overall good correlation and low sum of squared error. Furthermore, modelling studies revealed that the oxygen transport is limited by surface exchange reactions from 700 to 850 °C and a mixture of both limiting cases above 850 up to 950 °C. It is concluded that the membranes exhibit high oxygen permeation flux of up to 2×10−6 mol s−1 cm−2 at 950 °C with Pair of 5 atm and Po 2 of 0.005 atm. The optimum range of operating conditions of the membrane are found to be at 950 °C with minimum Pair of 1 atm and P11 2 lower than 0.025 atm.

Sign in / Sign up

Export Citation Format

Share Document