Sulfate-Pillared Adsorbent for Efficient Acetylene Separation from Carbon Dioxide and Ethylene
Junhui Liu, Shuai Hua, Jingwen Chen, Shixia Chen, Zhenyu Zhou, Jun Wang, Shuguang Deng
Abstract
High Resolution Image Download MS PowerPoint Slide The effective separation of acetylene (C 2 H 2 ) from carbon dioxide (CO 2 ) and ethylene (C 2 H 4 ) presents considerable challenges in the petrochemical industry. In this work, we report a novel sulfate-pillared (SO 4 2– ) ultra-microporous material, denoted as SOFOUR-DPDS-Ni (SOFOUR = SO 4 2–, 4-DPDS = 4,4′-dipyridyldisulfide), for efficient C 2 H 2 capture from both CO 2 and C 2 H 4 . The sulfate pillars play a crucial role in inducing robust negative electrostatic potentials within the intralayer cavities and interlayer channels, thereby facilitating the selective recognition of C 2 H 2 . As a result, SOFOUR-DPDS-Ni demonstrates a remarkable C 2 H 2 adsorption capacity of 1.60 mmol g –1 at 0.01 bar, an exceptional selectivity of 174 for the 50/50 C 2 H 2 /CO 2 mixture, and a high selectivity of 65 for the 1/99 C 2 H 2 /C 2 H 4 mixture. These impressive metrics position SOFOUR-DPDS-Ni as a promising adsorbent for benchmark C 2 H 2 separations. Dynamic breakthrough experiments validate its outstanding performance in separating C 2 H 2 from both the CO 2 and C 2 H 4 mixtures. Computational simulations reveal the strong interactions between C 2 H 2 and sulfate pillars, shedding light on the underlying mechanisms driving the adsorption process.