Dual pore‐size sieving in a novel oxygenate‐pillared microporous adsorbent for C6 alkane isomers separation. Issue 3 (29th October 2022)

• Record Type: Journal Article
• Authors: Su, Yun; Chen, Rundao; Zhang, Peixin; He, Xiao; Liu, Xing; Liu, Yuan; Xiong, Hanting; Zhao, Zhiwei; Luo, Junhui; Chen, Jingwen; Chen, Shixia; Zeng, Zeling; Bao, Zongbi; Deng, Shuguang; Wang, Jun
• Is Part Of: AIChE journal. Volume 69:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-29
• Subjects: adsorptive separation -- C6 alkanes -- equilibrium–kinetic effect -- metal–organic framework -- molecular sieving; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; 660.28
• DOI: 10.1002/aic.17937
• Languages: English
• ISSNs: 0001-1541

Abstract

Abstract: Adsorbents executing molecular sieving mechanisms for the efficient separation of n ‐hexane (C6) alkane isomers require delicate pore size control, but afford unsatisfactory single‐component separations according to their branch degrees. Herein, we report a novel oxygenate‐pillared microporous adsorbent, MoOFOUR‐Co‐tpb, ([Co(tpb)2 MoO4 ], tpb = 1, 2, 4, 5‐tetra(pyridin‐4‐yl) benzene), with three gourd‐shaped channels for dual pore‐size sieving of C6 isomers. In particular, MoOFOUR‐Co‐tpb excludes 2, 2‐dimethylbutane, while 3‐methylpentane (3MP) can enter one channel showing a high uptake of 82.6 mg g −1, contrasting to the n ‐hexane ( n HEX) adsorption by two channels (136 mg g −1 ). This dual pore‐size control strategy renders a record high equilibrium–kinetic combined selectivity for n HEX/3MP (30.2). Moreover, three‐ and five‐component breakthrough experiments confirm the practical separation performances and cycling stability. Multiple theoretical simulations reveal the separation mechanism and adsorption sites.