Efficient Separation of Acetylene and Carbon Dioxide in a Decorated Zeolite. (10th February 2021)

• Record Type: Journal Article
• Authors: Liu, Shanshan; Han, Xue; Chai, Yuchao; Wu, Guangjun; Li, Weiyao; Li, Jiangnan; da Silva, Ivan; Manuel, Pascal; Cheng, Yongqiang; Daemen, Luke L.; Ramirez‐Cuesta, Anibal J.; Shi, Wei; Guan, Naijia; Yang, Sihai; Li, Landong
• Is Part Of: Angewandte Chemie. Volume 133:Number 12(2021)
• Page Start: 6600
• Page End: 6606
• Publication Date: 2021-02-10
• Subjects: acetylene -- gas separation -- neutron diffraction -- neutron scattering -- zeolites; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202014680
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: The almost identical molecular sizes and volatilities of acetylene and carbon dioxide make their separation extremely challenging in industry. Reported here is the efficient separation of acetylene and carbon dioxide (v/v=2/1, which is relevant to that in the industrial cracking stream) in faujasite zeolites decorated with atomically‐dispersed copper(II) sites under ambient conditions. In situ neutron powder diffraction and inelastic neutron scattering confirm that the confined copper(II) site displays chemoselective yet reversible binding to acetylene, whereas adsorbed carbon dioxide molecules are stabilized by weak host–guest supramolecular interactions with the framework oxygen centers, thus resulting in the efficient separation of these two gases under flow conditions. A designed adsorption‐purging‐desorption system based upon Cu@FAU is established for the recovery of high purity acetylene (98–99 %) from the mixture of acetylene and carbon dioxide, offering an unprecedented separation factor of 22.2 with an effective dynamic uptake of acetylene of 1.51 mmol g −1 at 298 K. Abstract : A decorated zeolite material, Cu@FAU, exhibits highly selective adsorption of acetylene and thus efficient separation of acetylene and carbon dioxide, unlocking the potential of zeolite materials in challenging industrial separations.