Microchannel structure of ceramic membranes for oxygen separation

Abstract

Microchanneled ceramic membranes have demonstrated superior performance in oxygen separation from air over conventional membranes. In this study, the contributions of the microchannel structure to the superior performance were investigated. Compared with supported membranes, the microchanneled membranes provide fast pathways within the channels for gas diffusion as compared to the tortuous interconnection of pore channels in the supported membranes. The walls of the numerous channels provide a large surface for facilitating oxygen dissociation, which was confirmed by varying the channel wall surface using mesh templates with different aperture sizes. In summary, the microchannel structure facilitates gas diffusion and provides a large membrane active surface, resulting in high performance in oxygen separation.

Mixed Ionic-Electronic Conducting Membranes (MIEC) for Their Application in Membrane Reactors: A Review

“…Lastly, another important aspect that would improve the oxygen permeability is the use of micro-channeled membranes. This type of structure greatly increase oxygen separation rates from air compared with conventional dense membranes or supported membranes, as reported by Shao et al [67]. Gas diffusion through the straight channels have a less tortuous path than the interconnected pores in a convectional supported membrane.…”

Preparation of porous Al2O3 ceramics by starch consolidation casting method

“…In recent years, porous ceramics have attracted more attention due to their low density, low thermal conductivity, high porosity, high specific area, and good thermal shock resistance . They have been utilized to produce separation membranes, thermal insulation systems, catalyst supports, implantable bioceramics, and other uses. In particular, porous alumina ceramics—as one of the most popular oxide ceramics—have been used for a wide range of applications, including: separation materials, membranes, and implantable bioceramics .…”

Asymmetric La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ membrane with reduced concentration polarization prepared by phase-inversion tape casting and warm pressing

“…effective approach for preparation of high performance asymmetric MIEC membranes. The oxygen permeation flux was much higher than that of a similar membrane obtained by conventional tape casting [16,17]. This was ascribed to the fast gas transport in the porous support, which was greatly facilitated by the abundant presence of large and straight finger-like pores [18,19].…”