Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes
Developing silica membranes that are highly selective for CO2 has always been a challenge due to the small sizes of the pores and less amount of CO2 philic sites in a typical silica network structure. Herein, we describe the fabrication of silica (tetraethoxysilane) membranes functionalized with 3-a...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-05-01
|
| Series: | Journal of Membrane Science Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772421223000119 |
| _version_ | 1797798541333102592 |
|---|---|
| author | Ikram Rana Hiroki Nagasawa Toshinori Tsuru Masakoto Kanezashi |
| author_facet | Ikram Rana Hiroki Nagasawa Toshinori Tsuru Masakoto Kanezashi |
| author_sort | Ikram Rana |
| collection | DOAJ |
| description | Developing silica membranes that are highly selective for CO2 has always been a challenge due to the small sizes of the pores and less amount of CO2 philic sites in a typical silica network structure. Herein, we describe the fabrication of silica (tetraethoxysilane) membranes functionalized with 3-aminopropyltriethoxysilyl (APTES) and trifluoroacetic acid (TFA). An interaction generated among primary (NH2) amines and TFA was identified, which was then also revealed by the reversible nature of CO2 adsorption/desorption — an opposite trend from observations when using another catalyst (HCl). The resultant TEOS-APTES (TFA) membranes demonstrated CO2 permeance of 3.8 × 10−7 mol m − 2 s − 1 Pa−1 and CO2/N2 selectivity of 35 at 50 ⁰C via the effect of surface diffusion. This is attributed to the increased microporosity and structural variations affected by TFA, which enhanced molecular sieving and controls the CO2-philic sites (-NHCOCF3) via interaction with amines. This novel approach would be effective for the energy-efficient fabrication of highly CO2-permeable membranes. |
| first_indexed | 2024-03-13T04:05:17Z |
| format | Article |
| id | doaj.art-6924810545c34258a41b0cea3bb96509 |
| institution | Directory Open Access Journal |
| issn | 2772-4212 |
| language | English |
| last_indexed | 2024-03-13T04:05:17Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Membrane Science Letters |
| spelling | doaj.art-6924810545c34258a41b0cea3bb965092023-06-21T07:01:34ZengElsevierJournal of Membrane Science Letters2772-42122023-05-0131100047Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranesIkram Rana0Hiroki Nagasawa1Toshinori Tsuru2Masakoto Kanezashi3Chemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, JapanChemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, JapanChemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, JapanCorresponding author.; Chemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8527, JapanDeveloping silica membranes that are highly selective for CO2 has always been a challenge due to the small sizes of the pores and less amount of CO2 philic sites in a typical silica network structure. Herein, we describe the fabrication of silica (tetraethoxysilane) membranes functionalized with 3-aminopropyltriethoxysilyl (APTES) and trifluoroacetic acid (TFA). An interaction generated among primary (NH2) amines and TFA was identified, which was then also revealed by the reversible nature of CO2 adsorption/desorption — an opposite trend from observations when using another catalyst (HCl). The resultant TEOS-APTES (TFA) membranes demonstrated CO2 permeance of 3.8 × 10−7 mol m − 2 s − 1 Pa−1 and CO2/N2 selectivity of 35 at 50 ⁰C via the effect of surface diffusion. This is attributed to the increased microporosity and structural variations affected by TFA, which enhanced molecular sieving and controls the CO2-philic sites (-NHCOCF3) via interaction with amines. This novel approach would be effective for the energy-efficient fabrication of highly CO2-permeable membranes.http://www.sciencedirect.com/science/article/pii/S2772421223000119Amine-silica membranesTrifluoroacetic acidAmide formationCO2 separation |
| spellingShingle | Ikram Rana Hiroki Nagasawa Toshinori Tsuru Masakoto Kanezashi Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes Journal of Membrane Science Letters Amine-silica membranes Trifluoroacetic acid Amide formation CO2 separation |
| title | Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes |
| title_full | Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes |
| title_fullStr | Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes |
| title_full_unstemmed | Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes |
| title_short | Catalytic effect of trifluoroacetic acid on the CO2 transport properties of organic-inorganic hybrid silica membranes |
| title_sort | catalytic effect of trifluoroacetic acid on the co2 transport properties of organic inorganic hybrid silica membranes |
| topic | Amine-silica membranes Trifluoroacetic acid Amide formation CO2 separation |
| url | http://www.sciencedirect.com/science/article/pii/S2772421223000119 |
| work_keys_str_mv | AT ikramrana catalyticeffectoftrifluoroaceticacidontheco2transportpropertiesoforganicinorganichybridsilicamembranes AT hirokinagasawa catalyticeffectoftrifluoroaceticacidontheco2transportpropertiesoforganicinorganichybridsilicamembranes AT toshinoritsuru catalyticeffectoftrifluoroaceticacidontheco2transportpropertiesoforganicinorganichybridsilicamembranes AT masakotokanezashi catalyticeffectoftrifluoroaceticacidontheco2transportpropertiesoforganicinorganichybridsilicamembranes |