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https://hdl.handle.net/2440/126298
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Type: | Journal article |
Title: | Boosting CO₂ adsorption and selectivity in metal-organic frameworks of MIL-96(Al) Via second metal Ca coordination |
Other Titles: | Boosting CO2 adsorption and selectivity in metal-organic frameworks of MIL-96(Al) Via second metal Ca coordination |
Author: | Abid, H.R. Rada, Z.H. Li, Y. Mohammed, H.A. Wang, Y. Wang, S. Arandiyan, H. Tan, X. Liu, S. |
Citation: | RSC Advances: an international journal to further the chemical sciences, 2020; 10(14):8130-8139 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2020 |
ISSN: | 2046-2069 2046-2069 |
Statement of Responsibility: | Hussein Rasool Abid, Zana Hassan Rada, Yuan Li, Hussein A. Mohammed, Yuan Wang, Shaobin Wang, Hamidreza Arandiyan, Xiaoyao Tan and Shaomin Liu |
Abstract: | Aluminum trimesate-based MOF (MIL-96-(Al)) has attracted intense attention due to its high chemical stability and strong CO2 adsorption capacity. In this study, CO2 capture and selectivity of MIL-96-Al was further improved by the coordination of the second metal Ca. To this end, a series of MIL-96(Al)–Ca were hydrothermally synthesised by a one-pot method, varying the molar ratio of Ca2+/Al3+. It is shown that the variation of Ca2+/Al3+ ratio results in significant changes in crystal shape and size. The shape varies from the hexagonal rods capped in the ends by a hexagonal pyramid in MIL-96(Al) without Ca to the thin hexagonal disks in MIL-96(Al)–Ca4 (the highest Ca content). Adsorption studies reveal that the CO2 adsorption on MIL-96(Al)–Ca1 and MIL-96(Al)–Ca2 at pressures up to 950 kPa is vastly improved due to the enhanced pore volumes compared to MIL-96(Al). The CO2 uptake on these materials measured in the above sequence is 10.22, 9.38 and 8.09 mmol g−1, respectively. However, the CO2 uptake reduces to 5.26 mmol g−1 on MIL-96(Al)–Ca4. Compared with MIL-96(Al)–Ca1, the N2 adsorption in MIL-96(Al)–Ca4 is significantly reduced by 90% at similar operational conditions. At 100 and 28.8 kPa, the selectivity of MIL-96(Al)–Ca4 to CO2/N2 reaches up to 67 and 841.42, respectively, which is equivalent to 5 and 26 times the selectivity of MIL-96(Al). The present findings highlight that MIL-96(Al) with second metal Ca coordination is a potential candidate as an alternative CO2 adsorbent for practical applications. |
Rights: | This journal is © The Royal Society of Chemistry 2020. Open Access Article.This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
DOI: | 10.1039/d0ra00305k |
Grant ID: | http://purl.org/au-research/grants/arc/DP170104264 |
Published version: | http://dx.doi.org/10.1039/d0ra00305k |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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