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Open AccessArticle

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

1
Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
2
Institut für Materialwissenschaft, Technische Universität Darmstadt, Otto-Berndt-Str. 3, 64287 Darmstadt, Germany
3
CNRS, IRCER, UMR 7315, University of Limoges, F-87000 Limoges, France
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(10), 258; https://doi.org/10.3390/membranes10100258
Received: 28 August 2020 / Revised: 21 September 2020 / Accepted: 24 September 2020 / Published: 25 September 2020
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 γ-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/γ-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. View Full-Text
Keywords: allyl-hydrido-polycarbosilane (AHPCS); organic–inorganic hybrid; hydrophobicity; membrane; hydrogen separation; hydrogen affinity; polymer-derived ceramics (PDCs) allyl-hydrido-polycarbosilane (AHPCS); organic–inorganic hybrid; hydrophobicity; membrane; hydrogen separation; hydrogen affinity; polymer-derived ceramics (PDCs)
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MDPI and ACS Style

Kubo, M.; Mano, R.; Kojima, M.; Naniwa, K.; Daiko, Y.; Honda, S.; Ionescu, E.; Bernard, S.; Riedel, R.; Iwamoto, Y. Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes. Membranes 2020, 10, 258. https://doi.org/10.3390/membranes10100258

AMA Style

Kubo M, Mano R, Kojima M, Naniwa K, Daiko Y, Honda S, Ionescu E, Bernard S, Riedel R, Iwamoto Y. Hydrogen Selective SiCH Inorganic–Organic Hybrid/γ-Al2O3 Composite Membranes. Membranes. 2020; 10(10):258. https://doi.org/10.3390/membranes10100258

Chicago/Turabian Style

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" Membranes 10, no. 10: 258. https://doi.org/10.3390/membranes10100258

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