Zeolites for the separation of ethylene, ethane, and ethyne

doi:10.1007/s11705-024-2459-4

Front. Chem. Sci. Eng.

2024, Vol. 18

Issue (9) : 108 https://doi.org/10.1007/s11705-024-2459-4

Zeolites for the separation of ethylene, ethane, and ethyne

Binyu Wang¹, Qiang Li¹, Haoyang Zhang¹, Jia-Nan Zhang², Qinhe Pan³, Wenfu Yan¹(

)

¹. State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
². Key Laboratory of Advanced Energy Catalytic and Functional Materials Preparation, College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450012, China
³. Key Laboratory of Advanced Materials of Tropical Island Resources (Ministry of Education), School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China

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Abstract

The cost-effective separation of ethylene (C₂H₄), ethyne (C₂H₂)_, and ethane (C₂H₆) poses a significant challenge in the contemporary chemical industry. In contrast to the energy-intensive high-pressure cryogenic distillation process, zeolite-based adsorptive separation offers a low-energy alternative. This review provides a concise overview of recent advancements in the adsorptive separation of C₂H₄, C₂H₂, and C₂H₆ using zeolites or zeolite-based adsorbents. It commences with an examination of the industrial significance of these compounds and the associated separation challenges. Subsequently, it systematically examines the utilization of various types of zeolites with diverse cationic species in such separation processes. And then it explores how different zeolitic structures impact adsorption and separation capabilities, considering principles such as cation-π interaction, π-complexation, and steric separation concerning C₂H₄, C₂H₂, and C₂H₆ molecules. Furthermore, it discusses methods to enhance the separation performance of zeolites and zeolite-based adsorbents, encompassing structural design, modifications, and ion exchange processes. Finally, it summarizes current research trends and future directions, highlighting the potential application value of zeolitic materials in the field of C₂H₄, C₂H₂, and C₂H₆ separation and offering recommendations for further investigation.

Keywords zeolite ethylene ethane cation-π interaction π-complexation

Corresponding Author(s): Wenfu Yan

Just Accepted Date: 19 April 2024 Issue Date: 19 June 2024

Cite this article:

Binyu Wang,Qiang Li,Haoyang Zhang, et al. Zeolites for the separation of ethylene, ethane, and ethyne[J]. Front. Chem. Sci. Eng., 2024, 18(9): 108.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-024-2459-4
https://academic.hep.com.cn/fcse/EN/Y2024/V18/I9/108

Tab.1 The physical properties of C₂H₂, C₂H₄, and C₂H₆

Fig.2 Description of the zeolitic structure of ITQ-55. (a) A 48T heart-shaped cage. (b) Dimeric 48T cages. The yellow ring indicates the interconnecting 8-ring (8MR). (c) Projection along the b axis of the ITQ- 55 structure (oxygen atoms omitted for clarity; T atoms in gray; two of the heart-shaped cavities highlighted in blue and red, respectively, for clarity). (d) ITQ-55 window sizes. Distributions of the minimal 8MR window size for the empty structure of ITQ-55 (left) and the ITQ-55 structure with C₂H₄ molecules constrained to the center of the 8MR window (right), as calculated from the density functional theory (DFT) molecular dynamics simulations at 300 K. Reprinted with permission from Ref. [50], copyright 2017, the American Association for the Advancement of Science.

Fig.4 Schematic presentation of the cation location and site definition for Ag-modified LTA zeolites. (a) Composition A (|Na₄Ca₁₃Ag₆₆|[Al₁₂Si₁₂O₄₈]₈). (b) Composition B (|Na₄Ca₁₃Ag₈₄|[Al₁₂Si₁₂O₄₈]₈). (c) Illustration of the cation position in an α-cage. (d) Illustration of the Ag₂O position in two α-cages. Atoms: purple, Na⁺; green, Ca²⁺; and blue, Ag⁺. Reprinted with permission from Ref. [56], copyright 2023, ACS Publications.

Fig.5 (a) The adsorption energy of C₂H₄ and C₂H₆ on Cu (I)Y, Cu (II)Y, and NaY zeolites. (b) π-complex bonding diagram of C₂H₄–Cu(I). (c) Charge density difference of C₂H₄ adsorbed on Cu(I) and Cu(II). (d) FAU structure with cationic sites. Reprinted with permission from Ref. [64], copyright 2023, RSC Publishing.

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