A Metal–Organic Framework Based Methane Nano‐trap for the Capture of Coal‐Mine Methane. (22nd May 2019)

• Record Type: Journal Article
• Authors: Niu, Zheng; Cui, Xili; Pham, Tony; Lan, Pui Ching; Xing, Huabin; Forrest, Katherine A.; Wojtas, Lukasz; Space, Brian; Ma, Shengqian
• Is Part Of: Angewandte Chemie. Volume 131:Number 30(2019)
• Page Start: 10244
• Page End: 10247
• Publication Date: 2019-05-22
• Subjects: Kohleminen-Methan -- Kooperativer Effekt -- Gastrennung -- Metall-organische Gerüste -- Nanotraps; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201904507
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: As a major greenhouse gas, methane, which is directly vented from the coal‐mine to the atmosphere, has not yet drawn sufficient attention. To address this problem, we report a methane nano‐trap that features oppositely adjacent open metal sites and dense alkyl groups in a metal–organic framework (MOF). The alkyl MOF‐based methane nano‐trap exhibits a record‐high methane uptake and CH4 /N2 selectivity at 298 K and 1 bar. The methane molecules trapped within the alkyl MOF were crystalographically identified by single‐crystal X‐ray diffraction experiments, which in combination with molecular simulation studies unveiled the methane adsorption mechanism within the MOF‐based nano‐trap. The IAST calculations and the breakthrough experiments revealed that the alkyl MOF‐based methane nano‐trap is a new benchmark for CH4 /N2 separation, thereby providing a new perspective for capturing methane from coal‐mine methane to recover fuel and reduce greenhouse gas emissions. Abstract : In der Falle : Eine MOF‐basierte Methan‐„Nanofalle" mit gegenüberliegenden offenen Metallzentren zur Absorption von Kohleminen‐Methan wurde entwickelt. Sie zeigt bei Standarddruck eine rekordverdächtige Methan‐Aufnahme und setzt einen neuen Maßstab für die CH4 /N2 ‐Trennung. Der Bindungsmechanismus wurde mittels Einkristall‐Röntgenbeugungsexperimenten und Molekulardynamik‐Simulationen untersucht.