Perovskite Hollow‐Fiber Membranes for the Production of Oxygen‐Enriched Air

Abstract

Mixed‐ion and electron‐conducting perovskite membranes are used to produce oxygen‐enriched air (see picture). These membranes are thermally and mechanically stable at high temperatures (>875 °C) over a long period of time, thus making them suitable for industrial processes. Oxygen concentrations of the enriched air typically reach 30–50 vol %.

Oxygen permeation through perovskite membranes and the improvement of oxygen flux by surface modification

“…Current tonnage O 2 production by cryogenic processes is very energy expensive and production cost reduction by 35% or more is required [1][2][3][4], which in turn is driving academic and industrial researchers toward membrane technology development for the last decade. Of particular attention, ion conducting ceramic membranes have attracted the attention of the research community, with over 20 laboratories worldwide conducting research on the subject.…”

Current developments of mixed conducting membranes on porous substrates

“…In addition to its ability to support very thin walled membranes, the hollow fiber geometry also maximizes the surface area per unit volume. Recent developments show large improvements in oxygen permeation rates in hollow fibers 1,12,13,15,17,18 compared with flat, self-supported membranes. Similar results might be compared with some of the best results in the literature on flat supported membranes.…”

“…Hollow fiber membranes can be fabricated using simple processing steps, without the use of porous substrate. Perovskite capillaries with an outer diameter from 0.5 to 3 mm and wall thicknesses from 50 to 500 µm have been manufactured 12,13 . However, material measurements.…”

“…The perovskite structure exhibits good ionic and electronic conductivity leading to attractive oxygen flux 7 . In the last decade, intensive research has been dedicated to the preparation and characterization of MIEC membranes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] . However, a few reports can be found regarding to the preparation of crack-free membranes (with thicknesses less than 25 µm) for planar or tubular geometries.…”

Dense ceramic oxygen permeable membranes and catalytic membrane reactors

“…Recently, it was shown that the oxygen-enriched air can be produced by pressuring the feed air through the OPMs to another air side with lower pressure (Fig. 9) [120]. For example, an oxygen-enriched air with the oxygen content of 40-50% can be produced to satisfy the demand of ammonia production.…”