Preparation and Property of GDC-LSF Dual-phase Composite Membrane with Straight Pores and Sandwich Structure

doi:10.15541/jim20200421

Abstract

Abstract:

The dense ceramic oxygen-permeable membrane has attracted much attention due to its potential applications in production of oxygen from air and manipulation of oxygen-consuming industrial chemical processes. In the present study, Gd_0.1Ce_0.9O_2-_δ-La_0.6Sr_0.4FeO_3-_δ (GDC-LSF) dual-phase composite membrane was prepared using the phase-inversion tape casting/lamination/sintering method. The as-prepared membrane consisted of an 80 μm thick dense oxygen separation layer sandwiched between two 420 μm thick finger-like porous support layers. The inner surface of the support layers was further modified with Nd₂NiO₄₊_δ (NNO) nanoparticles using the impregnation method. An oxygen permeation flux of 1.53 mL·cm^-2·min^-1 was measured at 900 ℃ by exposing one side of the membrane to a flowing air stream and the other side to a flowing He stream. When CO₂ was used as sweep gas, an oxygen permeation flux of 0.6 mL·cm^-2·min^-1 was obtained, and no decrease in the flux was observed during 90 h of testing. The membrane remained intact after experiencing over 70 thermal cycles between 800 and 900 ℃. GDC-LSF dual-phase composite membrane with straight pores and sandwich structure has demonstrated satisfactory combination of oxygen permeability, chemical stability and thermal mechanical strength, promising for applications in separation of oxygen from air and oxy-fuel combustion with CO₂ capture.

Key words: oxygen-permeable membrane, dual-phase composite, phase-inversion tape casting, impregnation, straight pores, sandwich structure

CLC Number:

TQ174

ZHENG Qifan, LI Chaoqun, BAN Xiaokuan, ZHAN Zhongliang, CHEN Chusheng. Preparation and Property of GDC-LSF Dual-phase Composite Membrane with Straight Pores and Sandwich Structure[J]. Journal of Inorganic Materials, 2021, 36(5): 497-501.

Figures/Tables 9

Fig. 1 Schematic diagram of GDC-LSF membrane preparation process

Table 1 Composition of the slurries for the support prepared by phase-inversion tape casting (wt%)

Composition	Slurry 1 (Top)	Slurry 2 (Bottom)
GDC	35.92	-
LSF	20.58	-
Graphite	13.50	60.00
NMP	24.83	33.10
PESf	4.14	5.52
PVP	1.03	1.38

Table 2 Composition of the slurries for the dense layer prepared by conventional tape casting (wt%)

Composition	Weight percentage
GDC	36.33
LSF	20.80
Ethanol	16.80
2-Butanone	12.60
TEOA	1.72
PVB	5.75
PEG-400	3.00
DBP	3.00

Fig. 2 Experimental setup for oxygen permeation measurements

Fig. 3 XRD patterns of GDC-LSF membranes

Fig. 4 SEM images of GDC-LSF membrane (a) Cross-section of the support green tape; (b) Cross-section of the sintered membrane; (c) Top-view of the support; (d) Magnified view of the NNO nano-particles in the support

Fig. 5 Oxygen permeation flux as a function of temperature when using He as sweep gas

Fig. 6 Electrical conductivity relaxation curves (normalized conductivity as a function of time) of GDC-LSF bar at 850 ℃ (a) and Arrhenius plots of the surface exchange coefficient at 800-900 ℃ (b) (1 bar=105 Pa)

Fig. 7 Temporal dependence of oxygen permeation flux of GDC-LSF membrane at 900 ℃

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