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Tailor-Made Modification of Commercial Ceramic Membranes for Environmental and Energy-Oriented Gas Separation Applications
| Content Provider | MDPI |
|---|---|
| Author | Grekou, Triantafyllia K. Koutsonikolas, Dimitris E. Karagiannakis, George Kikkinides, Eustathios S. |
| Copyright Year | 2022 |
| Description | Ceramic membranes have been considered as potential candidates for several gas separation processes of industrial interest, due to their increased thermal and chemical stability compared to polymeric ones. In the present study, commercial Hybrid Silica $(HybSi^{®}$) membranes have been evaluated and modified accordingly, to enhance their gas separation performance for targeted applications, including $CO_{2}$ removal from flue gas and $H_{2}$ recovery from hydrogen-containing natural gas streams. The developed membranes have been characterized before and after modification by relative permeability, single gas permeation, and equimolar separation tests of the respective gas mixtures. The modification procedures, involving in situ chemical vapor deposition and superficial functionalization, aim for precise control of the membranes’ pore size and surface chemistry. High performance membranes have been successfully developed, presenting an increase in $H_{2}/CH_{4}$ permselectivity from 12.8 to 45.6 at 250 °C. Ultimately, the modified $HybSi^{®}$ membrane exhibits a promising separation performance at 250 °C, and 5 bar feed pressure, obtaining above 92% $H_{2}$ purity in the product stream combined with a notable $H_{2}$ recovery of 65%, which can be further improved if a vacuum is applied on the permeate side, leading to 94.3% $H_{2}$ purity and 69% $H_{2}$ recovery. |
| Starting Page | 307 |
| e-ISSN | 20770375 |
| DOI | 10.3390/membranes12030307 |
| Journal | Membranes |
| Issue Number | 3 |
| Volume Number | 12 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-03-09 |
| Access Restriction | Open |
| Subject Keyword | Membranes Inorganic Membranes Silica Membranes Gas Mixture Separation Cvd Modification |
| Content Type | Text |
| Resource Type | Article |
