Tuning adsorption selectivity of H2S and CO2 with robust bimetallic metal-organic frameworks
Year: 2025
Type: article
Abstract: Mitigating global warming by carbon capture and storage is enshrined as the most prominent technology for environmental CO 2 emissions. However, separating impurities, such as H 2 S, in the captured CO 2 remains a challenge that incurs higher industrial processing costs. In this work, four metal-organic frameworks (MOFs) materials, UiO-66(Zr), MIL-68(In), MIL-101(Cr) and HKUST-1, were investigated for selective adsorption of H 2 S through breakthrough experiments. Bimetallic UiO-66(Zr/M) and MIL-101(Cr/M) (where M is Fe and Cu) were constructed by post-synthetic modification approach. Notably, the UiO-66(Zr/Cu) demonstrated an ultra-high separation of H 2 S over CO 2 , recording selectivity value of 50. Further analysis confirmed that H 2 S complex with hydroxyl groups on UiO-66(Zr/Cu) and then converted to elemental sulfur and sulfate by Cu(II) which is first reduced to Cu(I) and then oxidized back to Cu(II) in the presence of O 2 , completing the Cu redox cycle. Hence, the rational design of bimetallic framework materials is a promising technique for selective separation of H 2 S and CO 2 .
Language: English
Subfield: Inorganic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,060
OpenAlex ID: W4415979829