期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 295, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2022.121330
关键词
Adsorbent; Selective adsorption; Ethane/ethylene separation; Metal-organic framework
资金
- National Natural Science Foundation of China [22125804]
- Talent Introduction Fund of Hefei University of Technology
In this study, a MOF-based adsorbent, Ni-MOF-BD, was synthesized with ethanephilic environment by incorporating dense alkyl groups into its pores. Experimental results showed that Ni-MOF-BD exhibited a high C2H6 adsorption capacity of 88.9 cm(3).g(-1) and a C2H6/C2H4 adsorption capacity ratio of 137%. Molecular simulation study suggested that the alkyl groups inside the pores contributed to the enhanced C2H6 selectivity through strong van der Waals interactions.
Metal-organic frameworks (MOFs) have been widely applied as adsorbents for the purification of C2H4. Selective adsorption of C2H6 from C2H6/C2H4 mixture can be expected to directly achieve high purity C2H4 in a single separation step, but it remains a daunting challenge. Here, we fabricated a MOF-based adsorbent with ethanephilic environment, Ni-MOF-BD, by incorporation of dense alkyl groups into its pores. Experimental results show that the adsorption capacity of C2H6 on such adsorbent can be reached up to 88.9 cm(3).g(-1) at 298 K and 1 bar, and offering a C2H6/C2H4 adsorption capacity ratio of 137%. Corresponding ideal adsorption solution theory (IAST) calculation revealed that the adsorption selectivity reaches 2.0. Molecular simulation study indicates that the alkyl groups inside the pores is poised to bind with C2H6 through strong van der Waals interactions, rendering Ni-MOF-BD an enhanced C2H6 selectivity. The present work successfully demonstrated another strategy of improving adsorption affinity for C2H6 by developing MOF-based adsorbent with dense alkyl groups, thereby providing a new C2H6-selective adsorbent for purifying C2H4.
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