Lithium silicate based membranes for high temperature CO2 separation

Abstract

Processing and characterisation of a novel membrane system for CO 2 separation is detailed. The membrane was made of Lithium Orthosilicate (Li 4 SiO 4), which has potential to react with CO 2 molecules reversibly at high temperature. Using the membrane, a separation factor of 5.5 was measured between CO 2 and N 2 gas molecules at a temperature of 525 o C. The gas permeance value through the membrane at 525°C was around 10-8 mol/m 2 .s.Pa. Ionic diffusion through the liquid phase electrolyte and solid phase skeleton, produced by the reaction between CO 2 and Li 4 SiO 4 , was suggested to assist the selective permeance of CO 2. This facilitation effect was experimentally identified by examining the variation in CO 2 flux with partial pressure. Oxygen ion conductivity through the skeleton material, Li 2 SiO 3 , is reportedly very high and therefore charge balance should have been achieved by O 2transfer through the skeleton.

Capture of carbon dioxide over porous solid adsorbents lithium silicate, lithium aluminate and magnesium aluminate at pre-combustion temperatures

“…The lithium silicate showed good capturing capacity for the CO 2 at pre-combustion temperature conditions. The observed results of capturing capacity of lithium silicate for the CO 2 are also supported by the reported values in the literature 1) [6][7][8][9][10][11][12][13][14]. In lithium silicate, lithium plays an important role in capturing the CO 2 by forming lithium carbonate and then its decomposition in the presence of silica at high temperature.…”

“…Aluminum and iron doped in lithium silicate have been explored for capturing carbon dioxide from flue gases. Lithium silicate has been demonstrated as an excellent adsorbent for the capture of carbon dioxide [10][11][12][13]. The hydrotalcite containing calcium or magnesium and aluminum are good adsorbents for capturing carbon dioxide in the temperature range 100°C-500°C.…”

Density functional theory study of the structural, electronic, lattice dynamical, and thermodynamic properties of Li4SiO4and its capability for CODuan1, Parliński2 2011Phys. Rev. B654560View full textAdd to dashboardCite

“…From experimental investigations, Li 4 SiO 4 and Li 2 ZrO 3 are good candidates of solid sorbents for CO 2 capture in terms of large CO 2 sorption capacity, infinite CO 2 /N 2 or CO 2 /H 2 selectivity, good reversibility, and high operating temperature, 13,14,24,25,[45][46][47][48][49][50][51] based on the following reactions: (1) Li 4 SiO 4 + CO 2 = Li 2 CO 3 + Li 2 SiO 3 (2) Li 2 ZrO 3 + CO 2 = Li 2 CO 3 + ZrO 2 By assuming that the difference between the chemical potentials ( μ • ) of the solid phases of Li 2 SiO 3 and Li 4 SiO 4 and gas CO 2 molecule can be approximated by the difference in their total energies ( E DFT ), obtained directly from DFT calculations, and the vibrational free energy of the phonons ( F PH , excluding zero-point energy, which was already counted into the term E ZP ) and by ignoring the PV contribution terms for solids, as described in our previous papers, 24,25,28 the variation of the chemical potential ( μ) for reaction 1 with temperature and pressure can be written as…”

Catalytic Constructive Deoxygenation of Lignin-Derived phenols: New C–C Bond Formation Processes from Imidazole-Sulfonates and Ether Cleavage Reactions

“…and O 2-ionic species through the electrolytes (carbonate-metal oxide) phases formed by the reaction of the membrane with the CO 2 [87][88][89].…”