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Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes

Kubo, Miwako ; Mano, Ryota ; Kojima, Misako ; Naniwa, Kenichi ; Daiko, Yusuke ; Honda, Sawao ; Ionescu, Emanuel ; Bernard, Samuel ; Riedel, Ralf ; Iwamoto, Yuji (2020):
Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes.
In: Membranes, 10 (10), p. 258. MDPI, ISSN 2077-0375,
DOI: 10.3390/membranes10100258,
[Article]

Abstract

Solar hydrogen production via the photoelectrochemical water-splitting reaction is attractive as one of the environmental-friendly approaches for producing H2. Since the reaction simultaneously generates H2 and O2, this method requires immediate H2 recovery from the syngas including O2 under high-humidity conditions around 50 °C. In this study, a supported mesoporous gamma-Al2O3 membrane was modified with allyl-hydrido-polycarbosilane as a preceramic polymer and subsequently heat-treated in Ar to deliver a ternary SiCH organic-inorganic hybrid/gamma-Al2O3 composite membrane. Relations between the polymer/hybrid conversion temperature, hydrophobicity, and H2 affinity of the polymer-derived SiCH hybrids were studied to functionalize the composite membranes as H2-selective under saturated water vapor partial pressure at 50 °C. As a result, the composite membranes synthesized at temperatures as low as 300-500 °C showed a H2 permeance of 1.0-4.3 * 10-7 mol m-2 s-1 Pa-1 with a H2/N2 selectivity of 6.0-11.3 under a mixed H2-N2 (2:1) feed gas flow. Further modification by the 120 °C-melt impregnation of low molecular weight polycarbosilane successfully improved the H2-permselectivity of the 500 °C-synthesized composite membrane by maintaining the H2 permeance combined with improved H2/N2 selectivity as 3.5 * 10-7 mol m-2 s-1 Pa-1 with 36. These results revealed a great potential of the polymer-derived SiCH hybrids as novel hydrophobic membranes for purification of solar hydrogen.

Item Type: Article
Erschienen: 2020
Creators: Kubo, Miwako ; Mano, Ryota ; Kojima, Misako ; Naniwa, Kenichi ; Daiko, Yusuke ; Honda, Sawao ; Ionescu, Emanuel ; Bernard, Samuel ; Riedel, Ralf ; Iwamoto, Yuji
Title: Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes
Language: English
Abstract:

Solar hydrogen production via the photoelectrochemical water-splitting reaction is attractive as one of the environmental-friendly approaches for producing H2. Since the reaction simultaneously generates H2 and O2, this method requires immediate H2 recovery from the syngas including O2 under high-humidity conditions around 50 °C. In this study, a supported mesoporous gamma-Al2O3 membrane was modified with allyl-hydrido-polycarbosilane as a preceramic polymer and subsequently heat-treated in Ar to deliver a ternary SiCH organic-inorganic hybrid/gamma-Al2O3 composite membrane. Relations between the polymer/hybrid conversion temperature, hydrophobicity, and H2 affinity of the polymer-derived SiCH hybrids were studied to functionalize the composite membranes as H2-selective under saturated water vapor partial pressure at 50 °C. As a result, the composite membranes synthesized at temperatures as low as 300-500 °C showed a H2 permeance of 1.0-4.3 * 10-7 mol m-2 s-1 Pa-1 with a H2/N2 selectivity of 6.0-11.3 under a mixed H2-N2 (2:1) feed gas flow. Further modification by the 120 °C-melt impregnation of low molecular weight polycarbosilane successfully improved the H2-permselectivity of the 500 °C-synthesized composite membrane by maintaining the H2 permeance combined with improved H2/N2 selectivity as 3.5 * 10-7 mol m-2 s-1 Pa-1 with 36. These results revealed a great potential of the polymer-derived SiCH hybrids as novel hydrophobic membranes for purification of solar hydrogen.

Journal or Publication Title: Membranes
Journal volume: 10
Number: 10
Publisher: MDPI
Uncontrolled Keywords: Research Project for Future Development: Artificial Photosynthetic Chemical Process (ARPChem), (METI/NEDO, Japan: 2012-2022), New Energy and Industrial Technology Development Organization, allyl-hydrido-polycarbosilane (AHPCS); hydrogen affinity; hydrogen separation; hydrophobicity; membrane; organic-inorganic hybrid; polymer-derived ceramics (PDCs)
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 20 Oct 2020 05:29
DOI: 10.3390/membranes10100258
Official URL: https://doi.org/10.3390/membranes10100258
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