%0 Journal Article %T Superhydrophobic polycarbosilane membranes for purification of solar hydrogen %+ IRCER - Axe 4 : céramiques sous contraintes environnementales (IRCER-AXE4) %A Kubo, Miwako %A Okibayashi, Kohei %A Kojima, Misako %A Mano, Ryota %A Daiko, Yusuke %A Honda, Sawao %A Bernard, Samuel %A Iwamoto, Yuji %< avec comité de lecture %@ 1383-5866 %J Separation and Purification Technology %I Elsevier %V 258 %P 117998 %8 2021-03 %D 2021 %R 10.1016/j.seppur.2020.117998 %Z Chemical SciencesJournal articles %X Superhydrophobic membranes composed of an organic-inorganic hybrid polymer, namely polycarbosilane (PCS) with Mw of 4-8.9 ×10 3 , were formed on a mesoporous γ-Al 2O3-modified α-Al2O3 porous support. Under dry condition at 50 • C, the supported PCS membranes exhibited H2 permeance of 1.1-1.6 ×10 −6 mol⋅m −2 ⋅s −1 ⋅Pa −1 and H2/N2 selectivity of 9.7-12.6 together with unique H2/He selectivity of 1.4-1.6. Even under saturated humidity at 50 • C, H2 permeance remained at 7.7 ×10 −8 mol −1 m −2 s −1 Pa −1 with improved H2/N2 selectivity of 26. Moreover, when the measurements were performed using a H2-N2 (2:1) mixed feed gas as a simulated syngas produced by novel solar hydrogen production systems, the H2 permeance almost unchanged, while the N2 permeance was below the limit of detection. These results revealed a great potential of PCSs to develop novel H 2selective membranes for purifying solar hydrogen under high-humidity conditions around 50 • C. Further study on the gas permeation behaviors of He, H2 and N2 suggested that the enhanced H2/N2 selectivity under the highhumidity conditions could be explained by the synergistic effect of preferential H 2 permeation through the dense PCS network governed by the solid state diffusion mechanism and blockage of N 2 permeation through micropore channels within the PCS network by the permeate H2O-induced plugging at around the hetero interface between the superhydrophobic PCS and highly hydrophilic γ-Al 2O3. %G English %2 https://cnrs.hal.science/hal-03053383/document %2 https://cnrs.hal.science/hal-03053383/file/SepPurTechnol2021_versionHAL.pdf %L hal-03053383 %U https://cnrs.hal.science/hal-03053383 %~ UNILIM %~ CNRS %~ SPCTS %~ IPAM %~ SPCTS-AXE4 %~ INC-CNRS %~ IRCER %~ IRCER-AXE4 %~ IMPEO %~ TEST2-HALCNRS %~ TEST3-HALCNRS