CH 4 ‐Selective Mixed‐Matrix Membranes Containing Functionalized Silica for Natural Gas Purification

2020 ◽  
Vol 43 (11) ◽  
pp. 2167-2180
Author(s):  
Seyed Mohammdhadi Mousavi ◽  
Ahmadreza Raisi ◽  
Hamid Hashemi Moghaddam ◽  
Mohammad Salehi Maleh
Keyword(s):  
Natural Gas ◽  
Mixed Matrix Membranes ◽  
Gas Purification ◽  
Functionalized Silica ◽  
Mixed Matrix ◽  
Natural Gas Purification ◽  
Matrix Membranes

scholarly journals CO2/CH4 and H2/CH4 Gas Separation Performance of CTA-TNT@CNT Hybrid Mixed Matrix Membranes

Membranes ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 862
Author(s):  
Chhabilal Regmi ◽  
Saeed Ashtiani ◽  
Zdeněk Hrdlička ◽  
Karel Friess
Keyword(s):  
Natural Gas ◽  
Gas Separation ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Co2 Uptake ◽  
Gas Purification ◽  
Mixed Matrix ◽  
Natural Gas Purification ◽  
Hybrid Fillers ◽  
Matrix Membranes

This study explored the underlying synergy between titanium dioxide nanotube (TNT) and carbon nanotube (CNT) hybrid fillers in cellulose triacetate (CTA)-based mixed matrix membranes (MMMs) for natural gas purification. The CNT@TNT hybrid nanofillers were blended with CTA polymer and cast as a thin film by a facile casting technique, after which they were used for single gas separation. The hybrid filler-based membrane depicted a higher CO2 uptake affinity than the single filler (CNT/TNT)-based membrane. The gas separation results indicate that the hybrid fillers (TNT@CNT) are strongly selective for CO2 over CH4 and H2 over CH4. The increment in the CO2/CH4 and H2/CH4 selectivities compared to the pristine CTA membrane was 42.98 from 25.08 and 48.43 from 36.58, respectively. Similarly, the CO2 and H2 permeability of the CTA-TNT@CNT membrane increased by six- and five-fold, respectively, compared to the pristine CTA membrane. Such significant improvements in CO2/CH4 and H2/CH4 separation performance and thermal and mechanical properties suggest a feasible and practical approach for potential biogas upgrading and natural gas purification.

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