Details

Autor(en) / Beteiligte

• Karousos, D.S.
• Labropoulos, A.I.
• Tzialla, O.
• Papadokostaki, K.
• Gjoka, M.
• Stefanopoulos, K.L.
• Beltsios, K.G.
• Iliev, B.
• Schubert, T.J.S.
• Romanos, G.E.

Titel

Effect of a cyclic heating process on the CO2/N2 separation performance and structure of a ceramic nanoporous membrane supporting the ionic liquid 1-methyl-3-octylimidazolium tricyanomethanide

Ist Teil von

• Separation and purification technology, 2018-07, Vol.200, p.11-22

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •A SILM was developed by physical infiltration of [OMIM][TCM] within a ceramic tube.•The developed SILM was subjected to a cyclic heating process up to 180 °C.•The effect of the operation conditions on gas permeation properties was evaluated.•Confinement-enhanced catalytic effect of the surface chemistry on IL degradation.•Substantial increase in CO2 permeance and CO2/N2 selectivity after heat treatment. This work presents an investigation of the CO2 and N2 mixed-gas permeation rates through a supported ionic liquid membrane (SILM) developed on a ceramic composite nanofiltration substrate with a separation layer pore size of 10 nm. The ionic liquid 1-methyl-3-octylimidazolium tricyanomethanide was used as supported liquid phase. The hybrid membrane was subjected to a cyclic heating process including isothermal steps of 180 °C, under inert gas flow. In this context, the effect of temperature (over the range of 25–180 °C) and feed composition on the permeation properties and CO2/N2 separation performance was studied prior to and after completion of each heating cycle. For all heating cycles, the highest CO2/N2 selectivity values (up to 50.4) were provided at ambient temperature unlike to CO2 permeance that was favored by elevation of temperature, reaching to 2.48 · 10−9 mol·m−2·s−1·Pa−1 at 180 °C. Thermal analysis by means of DSC and TGA investigations allowed to determine the physical state and thermal stability of the immobilized IL phase, thereby providing a better understanding of the determined gas permeation properties. Confinement into the nanopores of the developed SILM substantially affected the thermal behaviour and assisted decomposition of the ionic liquid phase upon heat treatment. UV/Vis spectroscopy indicated formation of functionalized by-products during prolonged periods of heating at 180 °C that could form stable chemical complexes with CO2 molecules, thus drastically affecting both CO2 solubility and diffusivity, and CO2/N2 separation efficiency.