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Materials 2016, 9(11), 930; doi:10.3390/ma9110930

Separation of Hydrogen from Carbon Dioxide through Porous Ceramics

Department of Chemistry, Biotechnology, and Chemical Engineering, Kagoshima University, Kagoshima 890-0065, Japan
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Author to whom correspondence should be addressed.
Academic Editor: Tobias Fey
Received: 5 September 2016 / Revised: 8 November 2016 / Accepted: 10 November 2016 / Published: 16 November 2016
(This article belongs to the Special Issue Porous Ceramics)

Abstract

The gas permeability of α-alumina, yttria-stabilized zirconia (YSZ), and silicon carbide porous ceramics toward H2, CO2, and H2–CO2 mixtures were investigated at room temperature. The permeation of H2 and CO2 single gases occurred above a critical pressure gradient, which was smaller for H2 gas than for CO2 gas. When the Knudsen number (λ/r ratio, λ: molecular mean free path, r: pore radius) of a single gas was larger than unity, Knudsen flow became the dominant gas transportation process. The H2 fraction for the mixed gas of (20%–80%) H2–(80%–20%) CO2 through porous Al2O3, YSZ, and SiC approached unity with decreasing pressure gradient. The high fraction of H2 gas was closely related to the difference in the critical pressure gradient values of H2 and CO2 single gas, the inlet mixed gas composition, and the gas flow mechanism of the mixed gas. Moisture in the atmosphere adsorbed easily on the porous ceramics and affected the critical pressure gradient, leading to the increased selectivity of H2 gas. View Full-Text
Keywords: gas separation; hydrogen; carbon dioxide; porous ceramics gas separation; hydrogen; carbon dioxide; porous ceramics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Shimonosono, T.; Imada, H.; Maeda, H.; Hirata, Y. Separation of Hydrogen from Carbon Dioxide through Porous Ceramics. Materials 2016, 9, 930.

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