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

Kubo, Miwako and Mano, Ryota and Kojima, Misako and Naniwa, Kenichi and Daiko, Yusuke and Honda, Sawao and Ionescu, Emanuel and Bernard, Samuel and Riedel, Ralf and 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 and Mano, Ryota and Kojima, Misako and Naniwa, Kenichi and Daiko, Yusuke and Honda, Sawao and Ionescu, Emanuel and Bernard, Samuel and Riedel, Ralf and 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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