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Effective C4 Separation by Zeolite Metal-Organic Framework Composite Membranes. 2024

De Ao, and Zibo Yang, and Aibing Chen, and Yuxiu Sun, and Mao Ye, and Lei Tian, and Xixi Cen, and Zixi Xie, and Juan Du, and Zhihua Qiao, and Anthony K Cheetham, and Jingwei Hou, and Chongli Zhong
State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin, 300387, China.

Inorganic zeolites have excellent molecular sieving properties, but they are difficult to process into macroscopic structures. In this work, we use metal-organic framework (MOF) glass as substrates to engineer the interface with inorganic zeolites, and then assemble the discrete crystalline zeolite powders into monolithic structures. The zeolites are well dispersed and stabilized within the MOF glass matrix, and the monolith has satisfactory mechanical stabilities for membrane applications. We demonstrate the effective separation performance of the membrane for 1,3-butadiene (C4H6) from other C4 hydrocarbons, which is a crucial and challenging separation in the chemical industry. The membrane achieves a high permeance of C4H6 (693.00±21.83 GPU) and a high selectivity over n-butene, n-butane, isobutene, and isobutane (9.72, 9.94, 10.31, and 11.94, respectively). This strategy opens up new possibilities for developing advanced membrane materials for difficult hydrocarbon separations.

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