CO₂‐resistant SDC‐SSAF oxygen selective dual‐phase hollow fiber membranes

Abstract

Ce 0.85 Sm 0.15 O 1.925-Sm 0.6 Sr 0.4 Al 0.3 Fe 0.7 O 3-δ (SDC-SSAF) hollow fiber membranes aimed for oxyfuel application are fabricated via a phase inversionsintering technique using powders synthesized from EDTA-citrate complex method. Oxygen ions transport is revealed to be the limiting step that determines the overall oxygen transport rate in SDC-SSAF. SDC-SSAF hollow fiber membrane attained a maximum flux of 2.6 ml min −1 cm −2 at 950 C under an oxygen partial pressure difference of 1/0.02 atm (feed/permeate). Variation in oxygen partial pressure on the permeate side exerts larger influence on the oxygen permeation flux relative to the change on the feed side. Stability tests over 100 h demonstrate stable oxygen permeation flux under both He and CO 2 sweep conditions.

Roadmap for Sustainable Mixed Ionic‐Electronic Conducting Membranes

“…[5,6] Oxygen permeable membranes have been intensively investigated in the past decades and can be generally grouped into two types: single-phase and dual-phase (see Figure 2). [1,2,[15][16][17][18][19][20][21][22][23][24]7,[25][26][27][28][29][30][31][32][33][34]8,[35][36][37][38][9][10][11][12][13][14] Currently, Ba-, Sr-, or Co-containing single-phase perovskite-type oxygen-transporting membranes (OTMs) with a general formula of ABO 3 show high oxygen permeation and generally have an oxygen permeation flux of more than 1 mL min −1 cm −2 at 1173 K for a 1 mm-thick membrane. [1,2] However, these OTMs have a poor stability in the presence of CO 2 due to the formation of carbonates.…”

“…The hollow-fiber membranes typically have 0.1-0.3 mm wall thicknesses and 1-2 mm outer diameters (with a hollow space inside). This configuration is considered as the most promising and practical one to improve O 2 permeation flux [2,6,19,20,[24][25][26][27]32] and it is also widely used for other applications such as CO 2 conversion and H 2 production (details can be found in the following Sections 4-7 and Section 10). Hollow-fiber membranes, which enable to achieve high oxygen permeability, are getting increasingly interesting and they have been intensively studied in recent years.…”

“…Hollow-fiber membranes, which enable to achieve high oxygen permeability, are getting increasingly interesting and they have been intensively studied in recent years. [1,2,34,6,19,20,[24][25][26][27]32] Table 1 shows the performance comparison of various MIEC membranes recently reported in literature. The membranes with hollow-fiber configuration exhibited the most excellent oxygen permeability and stability, which should be a promising direction to be pursued in future.…”