Inorganic Composites for Gas Separation

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Materials".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 3036

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Guest Editor
School of Engineering, University of Edinburgh, Robert Stevenson Road, Edinburgh EH9 3FB, UK
Interests: membrane technology; gas separation; nanofibres; thin-film composite; mixed-matrices membranes
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Special Issue Information

Dear Colleagues,

Inorganic Composite present an interesting approach to improve the gas separation properties of polymeric membranes. Actually, most polymeric membranes suffer from a trade-off between gas permeability and selectivity, and tend to show aging, leading to plasticization and a decrease in performance. The development of inorganic composites, by embedding inorganic filler materials into polymers represents one promising route for solving these issues and improving membrane based separation. These membranes have the potential to synergistically combine the easy processability of polymers and the superior gas separation performance of filler materials.

In this special issue, we would like to invite significant contributions on the fabrication, modification, characterization and applications of inorganic composites for gas separation. Both original papers and reviews are welcome.

Dr. Elsa Lasseuguette
Guest Editor

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Keywords

  • mixed-matrices membrane
  • gas separation
  • thin-film composite
  • aging
  • transport phenomena
  • high-performance membranes

Published Papers (2 papers)

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Research

16 pages, 12220 KiB  
Article
The Functionalization of PES/SAPO-34 Mixed Matrix Membrane with [emim][Tf2N] Ionic Liquid to Improve CO2/N2 Separation Properties
by Jonathan S. Cardoso, Zhi Lin, Paulo Brito and Licínio M. Gando-Ferreira
Inorganics 2023, 11(11), 447; https://doi.org/10.3390/inorganics11110447 - 20 Nov 2023
Viewed by 1404
Abstract
The use of ionic liquid [emim][Tf2N] as an additive in polyethersulphone (PES) and nano-sized silico-aluminophosphate-34 (SAPO-34) mixed matrix membrane was studied through the incorporation of different amounts of [emim][Tf2N] in the membrane composition, as presented in this work, varying [...] Read more.
The use of ionic liquid [emim][Tf2N] as an additive in polyethersulphone (PES) and nano-sized silico-aluminophosphate-34 (SAPO-34) mixed matrix membrane was studied through the incorporation of different amounts of [emim][Tf2N] in the membrane composition, as presented in this work, varying from 10 to 40 wt%. Through gas permeation tests using CO2 and N2, the membrane composition containing 20 wt% [emim][Tf2N] led to the highest increase in CO2 permeability and CO2/N2 selectivity. The use of low concentrations of additive (10–20 wt%) promoted a state called antiplasticization; in this state, the permeability was even more regulated by the kinetic diameter of the species which, in this work, permitted achieving a higher CO2/N2 selectivity while increasing the CO2 permeability until an optimal condition. [emim][Tf2N] also promoted a better dispersion of SAPO-34 particles and an increase in the flexibility of the polymeric matrix when compared to a film with the same composition without [emim][Tf2N]. Moreover, the characterizations corroborated that the inclusion of [emim][Tf2N] increased the zeolite dispersion and improved the polymer/zeolite compatibility and membrane flexibility, characterized by a decrease in glass transition temperature, which helped in the fabrication process while presenting a similar thermal resistance and hydrophilicity as neat PES membrane, without affecting the membrane structure, as indicated by FTIR and a contact angle analysis. Full article
(This article belongs to the Special Issue Inorganic Composites for Gas Separation)
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18 pages, 5628 KiB  
Article
Ce0.8Y0.2O2-δ-BaCe0.8Y0.2O3-δ Dual-Phase Hollow Fiber Membranes for Hydrogen Separation
by Yuepeng Hei, Zuojun Lu, Claudia Li, Jian Song, Bo Meng, Naitao Yang, Sibudjing Kawi, Jaka Sunarso, Xiaoyao Tan and Shaomin Liu
Inorganics 2023, 11(9), 360; https://doi.org/10.3390/inorganics11090360 - 1 Sep 2023
Cited by 1 | Viewed by 1035
Abstract
Partial oxidation of methane (POM) is a prominent pathway for syngas production, wherein the hydrogen in syngas product can be recovered directly from the reaction system using a hydrogen (H2)-permeable membrane. Enhancing the efficiency of this H2 separation process is [...] Read more.
Partial oxidation of methane (POM) is a prominent pathway for syngas production, wherein the hydrogen in syngas product can be recovered directly from the reaction system using a hydrogen (H2)-permeable membrane. Enhancing the efficiency of this H2 separation process is a current major challenge. In this study, Ce0.8Y0.2O2-δ-BaCe0.8Y0.2O3-δ (YDC-BCY) hollow fiber (HF) membranes were developed and characterized for their H2 permeation fluxes. Firstly, YDC and BCY ceramic powders were synthesized using the sol-gel method, followed by the fabrication of YDC-BCY dual-phase ceramic HF membranes using a combined phase inversion–sintering process. Characterization using SEM, powder XRD, EDS, and electrical conductivity tests confirmed the phases of the prepared powders and HF membranes. Well-structured YDC and BCY powders with uniform particle sizes were obtained after calcination at 900 °C. With the addition of 1 wt.% Co2O3 as a sintering aid, the YDC-BCY dual-phase HF membrane achieved densification after sintering at 1500 °C. Subsequently, the influences of sweep gas composition and temperature on the hydrogen permeation of the YDC-BCY HF membranes with YDC/BCY molar ratios of 2:1, 3:1, and 4:1 were investigated. At 1000 °C and a sweep-gas flow rate of 120 mL·min−1, the YDC-BCY HF membrane with a YDC/BCY molar ratio of 4:1 exhibited a peak hydrogen flux of 0.30 mL·min−1 cm−2. There is significant potential for improving the hydrogen permeation of dual-phase ceramic membranes, with future efforts aimed at reducing dense layer thickness and enhancing the membrane material’s electronic and proton conductivities. Full article
(This article belongs to the Special Issue Inorganic Composites for Gas Separation)
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