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Microporous alumina–silica composite membrane with very low N2 permeability but high CO2 selectivity for direct air capture.

Giwa, Ayo; Shehu, Habiba; Ramalan, Muktar; Orakwe, Ifeyinwa; Abunomah, Ofasa; Ogunlude, Priscilla; Williamwest, Tamunotonye; Igbagara, Woyintonye; Ogoun, Evans; Hashim, Idris; Aisueni, Florence; Gobina, Edward

Authors

Ayo Giwa

Habiba Shehu

Ifeyinwa Orakwe

Ofasa Abunomah

Priscilla Ogunlude

Tamunotonye Williamwest

Edward Gobina



Contributors

Abid Ali Khan
Editor

M. Lutfi Ciddi
Editor

Mevlut Una
Editor

Abstract

This research involves technical approaches to capture carbon dioxide (CO2) from ambient air, involving a filter with a transport mechanism described based on experimental results. A silica inorganic composite membrane was prepared by using a silicone elastomer precursor, using the sol-gel method on the 15 nm pore of a TiO2/gamma alumina support (commercially available). All experiments were single gas transport. CO2, nitrogen (N2) and methane (CH4) flowrates were measured through the support, 1st dip coated and 2nd dip coated membranes respectively at room temperature and transmembrane pressure drops ranging from 0.01 to 0.1 bar. N2 was completely blocked from going through the CO2 membrane following the 2nd dip coating. The permeance of CO2 in this membrane is much lower than that in only pure silica, and it is thought to possess two types of micropores: ultra-micropores, through which only very small molecules such as helium (He) and hydrogen (H2) can permeate through; and a rather small number of micropores in which molecules such as CO2 and N2 were able to flow through but not simultaneously, as they are unable to pass one another within the pores due to selective adsorption of CO2. At low transmembrane pressure drop, the membranes showed complete blockage of N2 and only CO2 was able to permeate over the transmembrane pressure drop of 0.01-0.04 bars. This significant because in DAC renewable energy can be used to power fans/blowers that force the air through the membranes, thus making the specific energy requirement lower than that of the adsorption and absorption processes, together with higher productivity levels.

Citation

GIWA, A., SHEHU, H., RAMALAN, M., ORAKWE, I., ABUNOMAH, O., OGUNLUDE, P., WILLIAMWEST, T., IGBAGARA, W., OGOUN, E., HASHIM, I., AISUENI, F. and GOBINA, E. 2022. Microporous alumina–silica composite membrane with very low N2 permeability but high CO2 selectivity for direct air capture. In Khan, A.A., Ciddi, M.L. and Unal, M. (eds.) Proceedings of the 2022 International conference on studies in engineering, science and technology (ICSEST 2022), 10-13 November 2022, Antalya, Turkey. Ames, IA: International Society for Technology, Education and Science (ISTES) [online], pages 182-210. Available from: https://www.istes.org/seeder/books/files/54c86815762a9dac0440e35d04a1e05c.pdf

Presentation Conference Type Conference Paper (published)
Conference Name 2022 International conference on studies in engineering, science and technology (ICSEST 2022)
Start Date Nov 10, 2022
End Date Nov 13, 2022
Acceptance Date Nov 10, 2022
Online Publication Date Dec 31, 2022
Publication Date Dec 31, 2022
Deposit Date Aug 5, 2024
Publicly Available Date Aug 5, 2024
Publisher International Society for Technology, Education and Science (ISTES)
Peer Reviewed Peer Reviewed
Pages 182-210
ISBN 9781952092428
Keywords Carbon dioxide; Carbon capture; Membranes
Public URL https://rgu-repository.worktribe.com/output/1812643
Publisher URL https://www.istes.org/seeder/books/files/54c86815762a9dac0440e35d04a1e05c.pdf

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