Grima, L;
Mutch, GA;
Oliete, PB;
Bucheli, W;
Merino, RI;
Papaioannou, EI;
Bailey, JJ;
... Sanjuán, ML; + view all
(2021)
High CO₂ permeability in supported molten-salt membranes with highly dense and aligned pores produced by directional solidification.
Journal of Membrane Science
, 630
, Article 119057. 10.1016/j.memsci.2021.119057.
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Abstract
Composite molten salt-ceramic membranes are promising devices for high-temperature CO_{2} separation. Intensive material properties impact on separation performance as do membrane geometry (thickness) and microstructure (pore volume fraction, size, connectivity, and tortuosity factor). Although controlling pore size is considered somewhat routine, achieving pore alignment and connectivity is still challenging. Here we report the production of the first gas separation membrane using a porous ceramic matrix obtained from a directionally-solidified magnesium-stabilised zirconia (MgSZ) – MgO fibrilar eutectic as the membrane support. MgO was removed from the parent material by acid-etching to create a porous matrix with highly aligned pores with diameters of ~1 μm. X-ray nano-computed tomography of a central portion (~32,000 μm^{3}) of the support identified ~21% porosity, with all pores aligned within 10° and ~76% percolating along the longest sampled length. Employing the matrix as a support for a carbonate molten salt, a high CO_{2} permeability of 1.41x10^{-10} mol m^{-1}.s^{-1}.Pa^{-1} at 815 °C was achieved, among the highest reported for supported molten-carbonate membranes (typically 10 to 10 mol m .s .Pa at similar temperatures). We suggest that the high permeability is attributable to the excellent pore characteristics resulting from directional solidification, namely a dense array of parallel, micron-scale pores connecting the feed and permeate sides of the membrane.
| Type: | Article |
|---|---|
| Title: | High CO₂ permeability in supported molten-salt membranes with highly dense and aligned pores produced by directional solidification |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.memsci.2021.119057 |
| Publisher version: | http://dx.doi.org/10.1016/j.memsci.2021.119057 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | CO_{2} separation membranes, Dual-phase membranes, Permeation, MgSZ-MgO eutectic, Directional solidification |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10128789 |
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