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I11-High Resolution Powder Diffraction	Regulating extra-framework cations in faujasite zeolites for capture of trace carbon dioxide Shanshan Liu , Yinlin Chen , Bin Yue , Chang Wang , Bin Qin , Yuchao Chai , Guangjun Wu , Jiangnan Li , Xue Han , Ivan Da Silva , Pascal Manuel , Sarah J. Day , Naijia Guan , Stephen P. Thompson , Sihai Yang , Landong Li Chemistry – A European Journal DOI: 10.1002/chem.202201659 Diamond Proposal Number(s): [29649] Show Abstract ▼ Abstract: The development of cost-effective sorbents for direct capture of trace CO 2 (<1%) from the atmosphere is an important and challenging task. Natural or commercial zeolites are promising sorbents, but their performance in adsorption of trace CO 2 has been poorly explored to date. Herein, we report a systematic study on capture of trace CO 2 by commercial faujasite zeolites, where we found that the extra-framework cations played a key role on their performance. Under dry conditions, Ba-X displays high dynamic uptake of 1.79 and 0.69 mmol g -1 at CO 2 concentrations of 10000 and 1000 ppm, respectively, and shows excellent recyclability in the temperature-swing adsorption processes. K-X exhibits perfect moisture resistance, and >95 % dry CO 2 uptake can be preserved under relative humidity of 74%. In situ solid-state NMR spectroscopy, synchrotron X-ray diffraction and neutron diffraction reveal two binding sites for CO 2 in these zeolites, namely the basic framework oxygen atoms and the divalent alkaline earth metal ions. This study unlocks the potential of low-cost natural zeolites for applications in direct air capture.	Jun 2022

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I11-High Resolution Powder Diffraction

Regulating extra-framework cations in faujasite zeolites for capture of trace carbon dioxide