Selective Adsorption of n-Alkanes from n-Octane on Metal-Organic Frameworks: Length Selectivity

ACS Applied Materials & Interfaces
Biswa Nath Bhadra, Sung Hwa Jhung

Abstract

The liquid-phase adsorption of n-alkanes (from n-octane (C8) solvent) with different chain lengths was carried out over three metal-organic frameworks (MOFs), viz., metal-azolate framework-6 (MAF-6), copper-benzenetricarboxylate (Cu-BTC), and iron-benzenetricarboxylate (MIL-100(Fe)), and a conventional adsorbent activated carbon (AC). MAF-6 and Cu-BTC were found to have significant selectivity for the adsorption of n-dodecane (C12) and n-heptane (C7), respectively, from C8. Selectivity for C12 on MAF-6 was also observed in competitive adsorption from binary adsorbate systems. To understand the selective adsorption of C12 on MAF-6 more, the adsorption of C12 from C8 over MAF-6 was investigated in detail and compared with that over AC. The obtained selectivities over MAF-6 and Cu-BTC for C12 and C7, respectively, might be explained by the similarity between cavity size of adsorbents and molecular length of n-alkanes. In the case of AC and MIL-100(Fe), no specific adsorption selectivity was observed because the cavity sizes of the two adsorbents are larger than the size of the n-alkanes used in this study. The adsorption capacities (qt) of n-alkanes over AC and MIL-100(Fe) decreased and increased, respectively, as the polarity (or...Continue Reading

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Citations

May 27, 2017·ACS Applied Materials & Interfaces·Xiaocheng LiuGuangming Zeng
Sep 1, 2017·Chemical Communications : Chem Comm·Artur ChołujMichał J Chmielewski
Aug 9, 2019·Chemical Communications : Chem Comm·Falu HuMaochun Hong
Jan 6, 2018·Physical Chemistry Chemical Physics : PCCP·Minhua ZhangYifei Chen
Jul 19, 2017·Chemical Communications : Chem Comm·Tomoki OgoshiTada-Aki Yamagishi

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